{"id":2014,"date":"2026-09-18T06:41:38","date_gmt":"2026-09-18T06:41:38","guid":{"rendered":"https:\/\/superiortransmissioninc.com\/?post_type=product&p=2014"},"modified":"2026-09-18T06:41:38","modified_gmt":"2026-09-18T06:41:38","slug":"ep-duplex-worm-gears","status":"publish","type":"product","link":"https:\/\/superiortransmissioninc.com\/fr\/produit\/ep-duplex-worm-gears\/","title":{"rendered":"Engrenages \u00e0 vis sans fin EP-Duplex"},"content":{"rendered":"
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PRECISION BACKLASH-ELIMINATING DRIVE COMPONENTS \u2014 WORM GEAR SERIES<\/p>\n

Engrenages \u00e0 vis sans fin EP-Duplex<\/h2>\n

Une ing\u00e9nierie de pr\u00e9cision duplex worm gear<\/strong> system \u2014 tapered worm thread geometry enabling near-zero backlash adjustment (\u00b10.045 mm) through axial or rotational positioning, designed for CNC machine tool tables, precision indexing systems, metrological equipment, and any application where backlash elimination in a worm drive is a primary specification.<\/p>\n

Engrenage \u00e0 vis sans fin\u00a0<\/a><\/div>\n<\/div>\n<\/div>\n
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Technical Specifications \u2014 EP-Duplex Worm Gear Series<\/h2>\n

Core parameter reference. Custom worm hand, module, wheel tooth count, housing bore, and adjustment method available through our OEM programme.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Param\u00e8tre<\/th>\nEP Series Value<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
Product Type<\/td>\nDuplex Worm Gear Set (conical worm)<\/td>\nBacklash-adjustable worm drive<\/td>\n<\/tr>\n
Worm Type<\/td>\nConical (tapered) duplex worm<\/td>\nThread thickness varies axially<\/td>\n<\/tr>\n
Backlash Specification<\/td>\n\u00b10.045 mm (near-zero)<\/td>\nAt reference tooth \/ nominal center distance “a”<\/td>\n<\/tr>\n
Adjustment Methods<\/td>\nEccentric hub \/ Axial shift \/ System Ott \/ Dual disk wheel<\/td>\nFour options per housing design<\/td>\n<\/tr>\n
Reference Tooth Marking<\/td>\nV-groove (60\u00b0, 0.3 mm deep) on tip peripheral<\/td>\nIdentifies zero-backlash reference position<\/td>\n<\/tr>\n
Assembly Orientation<\/td>\nArrow stamped on worm and worm wheel<\/td>\nBoth arrows must point same direction (Fig. 3)<\/td>\n<\/tr>\n
Mati\u00e8re vermifuge<\/td>\nCase-hardened steel (58\u201362 HRC, ground)<\/td>\nRa \u2264 0.4 \u03bcm thread surface<\/td>\n<\/tr>\n
Mat\u00e9riau de roue \u00e0 vis sans fin<\/td>\nPhosphor bronze (CuSn10P) \/ Nylon \/ POM (option)<\/td>\nPer application load and duty cycle<\/td>\n<\/tr>\n
Worm Hand<\/td>\nRight-hand (RH) standard; LH on request<\/td>\nBoth drive directions supported<\/td>\n<\/tr>\n
Zero-Adjustment Mark<\/td>\nMarking groove (Markierungsrille) on worm shaft<\/td>\nAligns with null-backlash center distance<\/td>\n<\/tr>\n
Autobloquant<\/td>\nYes, at low lead angles<\/td>\nLead angle dependent<\/td>\n<\/tr>\n
Certification de qualit\u00e9<\/td>\nISO 9001:2015<\/td>\nFactory-wide QMS<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\"superiortransmissioninc-products-EP-Duplex<\/p>\n

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What Is a Duplex Worm Gear?<\/h2>\n

UN duplex worm gear<\/strong> is a specialised worm gear configuration designed specifically to eliminate \u2014 or reduce to a controllable minimum \u2014 the backlash that is inherent in conventional cylindrical worm drives. In a standard worm gear set, tooth-flank clearance is necessary to prevent tooth jamming due to manufacturing tolerances and thermal expansion, but this clearance appears as positioning deadband or lost motion in the output shaft. For CNC machine tables, telescope drives, metrological instruments, and precision actuators, this lost motion is directly equivalent to positioning error and is therefore unacceptable. The duplex worm gear<\/strong> solves this problem by using a conical (tapered) worm whose thread thickness varies along its length, so that axial displacement of the worm shaft moves the tooth contact point into a tighter mesh region, progressively removing the backlash without requiring component replacement.<\/p>\n

La s\u00e9rie EP duplex worm gear<\/strong> draws on four established backlash adjustment methods documented in precision engineering practice. The first adjusts center distance by rotating an eccentric hub that cradles both the worm shaft and the worm gear wheel \u2014 a compact, non-invasive method suitable for sealed gearbox housings. The second uses axial shifting of a conical worm (Fig. 2a): as the worm moves axially, the varying thread thickness brings the flanks into tighter engagement with the wheel. The third divides the worm into two halves (Fig. 2b, System Ott): the two half-worms are rotated or axially displaced relative to each other so that one flank of each half contacts opposite tooth flanks of the wheel simultaneously, eliminating all clearance. The fourth divides the worm wheel into two disks (Fig. 2c) that are turned close to each other so that their combined tooth flanks grip the worm thread from both sides.<\/p>\n

Each of these methods achieves the same engineering objective \u2014 near-zero backlash \u2014 through different physical mechanisms, giving the machine designer flexibility to select the approach that best fits the housing geometry, adjustment frequency, and assembly tooling available in their production environment.<\/p>\n<\/div>\n

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Five Engineering Advantages of the Duplex Worm Gear System<\/h2>\n
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\u2460 Near-Zero Backlash \u2014 Adjustable to \u00b10.045 mm<\/h3>\n

The defining technical property of the duplex worm gear<\/strong> is its adjustable near-zero backlash specification. When the reference tooth of the conical worm is aligned with the worm wheel center of rotation and the center distance is set to the designated value “a,” the gear set delivers a backlash of approximately \u00b10.045 mm \u2014 achievable in production assembly without component lapping, selective fitting, or post-assembly rework. This specification positions the duplex worm gear as the standard choice for CNC rotary tables, precision dividing heads, and indexing fixtures used in machine tool and metrology applications across Germany, Japan, and North America where positioning repeatability under 0.05 mm is a baseline production requirement.<\/p>\n<\/div>\n

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\u2461 Field-Adjustable Without Component Replacement<\/h3>\n

Unlike zero-backlash approaches requiring matched pairs or lapping, the duplex worm gear<\/strong> maintains its low-backlash specification through simple mechanical adjustment. As tooth wear gradually increases backlash over service life, the operator restores the original specification by shifting the worm axially or rotating the eccentric hub \u2014 adjustments performable in the field with standard tooling, often without removing the gearbox from the machine. This field-adjustability substantially lowers lifetime maintenance cost compared to alternatives requiring complete gear set replacement when backlash exceeds the acceptable limit.<\/p>\n<\/div>\n

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\u2462 Multiple Adjustment Methods \u2014 Design Flexibility<\/h3>\n

The four documented adjustment configurations \u2014 eccentric hub center distance variation, conical worm axial shift, System Ott dual half-worm, and dual disk worm wheel \u2014 give the machine designer genuine flexibility in how the backlash adjustment mechanism integrates into the housing and drive train. The conical worm axial shift method suits sealed gearboxes accessible only from the shaft end; the dual disk wheel method suits configurations where the worm shaft position is fixed and adjustment must come from the wheel side. No single universal duplex worm gear<\/strong> configuration fits all installation geometries, which is why the EP series covers all four.<\/p>\n<\/div>\n

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\u2463 Arrow-Mark Assembly System \u2014 Error-Proof Installation<\/h3>\n

Correct assembly orientation is critical in a duplex worm gear<\/strong> set because the tapered thread means only one axial position produces the minimum-backlash condition. An orientation arrow is stamped on both the duplex worm and the worm wheel. When assembling, the operator aligns the arrow on the worm wheel front face with the arrow direction on the worm shaft \u2014 both arrows must point in the same direction (Fig. 3). If orientation is incorrect, the center distance “a” deviates from the average value, making the gear group difficult to mesh and preventing proper tooth engagement. This built-in verification system prevents costly assembly errors without requiring specialist setup equipment.<\/p>\n<\/div>\n

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\u2464 Reference Tooth V-Groove \u2014 Repeatable Zero-Backlash Positioning<\/h3>\n

The reference tooth of the duplex worm gear<\/strong> is marked with a V-groove (60\u00b0, 0.3 mm deep) on the tip peripheral of the tooth. This groove designates the reference tooth whose position, when aligned with the worm wheel center of rotation and the center distance set at value “a,” produces the near-zero backlash condition (\u00b10.045 mm). The V-groove allows rapid, unambiguous identification of the reference tooth during assembly or readjustment \u2014 an important time-saving feature when the gear set must be dismantled for maintenance and reassembled to specification, particularly for equipment in metrology laboratories in the UK, South Korea, and Australia.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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How a Duplex Worm Gear Eliminates Backlash \u2014 The Four Methods<\/h2>\n

The fundamental question in understanding the duplex worm gear<\/strong> is how the duplex configuration extends the purpose of a standard worm drive. A standard worm gear transmits torque between 90\u00b0-crossed shafts at high reduction ratios, with inherent backlash from the tooth flank clearance. The duplex worm gear<\/strong> addresses this by cutting the worm with a conical (tapered) thread rather than a cylindrical one: thread thickness increases along the worm’s length, so advancing the worm axially tightens the contact and removes flank clearance.<\/p>\n

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Method 1 \u2014 Eccentric Hub Center Distance Variation (Fig. 1)<\/h3>\n

The worm shaft and worm gear wheel are cradled in an eccentric hub. Rotating the hub changes the center distance between the two gear axes, moving the worm thread into tighter engagement with the wheel tooth flanks. A zero-adjustment marking groove (Markierungsrille f\u00fcr Nulljustierung) on the worm shaft and an adjustment direction indicator (Nachstellrichtung) guide the operator to the correct null-backlash center distance without measurement instruments. This method suits sealed gearbox housings where the eccentric hub is accessible from outside by rotating a single adjustment element.<\/p>\n<\/div>\n

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Method 2 \u2014 Axial Shift of Conical Worm (Fig. 2a)<\/h3>\n

The worm is ground with a controlled conical taper along its length. Moving the worm axially within its bearing housing shifts the contact zone along the tapered thread flanks, bringing thicker thread sections into engagement with the wheel teeth and reducing tooth flank clearance. A single axial adjustment screw controls the worm position, and the backlash can be set to any value between the full-loose and full-tight positions. It is the preferred method in standard industrial duplex worm gear<\/strong> reducers where worm shaft accessibility is guaranteed by the gearbox design.<\/p>\n<\/div>\n

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Method 3 \u2014 System Ott: Division of Worm in Two Halves (Fig. 2b)<\/h3>\n

The worm is divided into two axial halves. The two half-worms are rotated or shifted relative to each other on a common shaft \u2014 one half-worm contacts the left flank of each wheel tooth, the other contacts the right flank simultaneously, eliminating all clearance on both flanks at once. System Ott is the highest-precision variant of the duplex worm gear<\/strong> family, specified in telescope mounts and scientific instrument drives where any positional uncertainty is unacceptable.<\/p>\n<\/div>\n

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Method 4 \u2014 Division of Wheel into Two Disks (Fig. 2c)<\/h3>\n

The worm wheel is split into two axial disks on the same hub. The two disks are rotated slightly relative to each other so their tooth flanks grip the worm thread from both sides simultaneously. This adjustment comes from the wheel side of the drive, making it suitable for configurations where the worm shaft position is fixed \u2014 for example a motor-integrated worm shaft that cannot be shifted axially. Turning the two disks close together until flank contact is achieved on both sides removes backlash without modifying the worm or its bearings.<\/p>\n<\/div>\n<\/div>\n

A practical question when specifying a duplex worm gear<\/strong> is: can a worm gear go both directions? Yes \u2014 worm gears drive in either rotational direction depending on the worm thread hand (RH or LH) and motor direction. The duplex adjustment mechanism is direction-neutral and eliminates backlash equally in both drive directions, making the duplex worm gear ideal for bidirectional servo-driven precision positioning axes.<\/p>\n<\/div>\n<\/div>\n

\"superiortransmissioninc-products-EP-Duplex<\/p>\n

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Assembly Verification \u2014 Orientation Arrows and Reference Tooth<\/h2>\n

Correct assembly of a duplex worm gear<\/strong> set is more critical than for a standard cylindrical worm drive, because the conical geometry means that only a specific rotational orientation of the worm relative to the wheel produces the intended backlash value. Two verification steps must be followed in sequence during initial installation and any subsequent reassembly after maintenance.<\/p>\n

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Step 1 \u2014 Verifying Assembly Orientation (Fig. 3)<\/h3>\n

An orientation arrow is stamped on the front face of both the duplex worm and the worm wheel. During assembly, the worm wheel is positioned so that its arrow mark on the front face aligns directionally with the arrow on the worm shaft \u2014 both arrows must point in the same direction. If the orientation is reversed, the center distance “a” will deviate above the average value, causing difficulty in gear engagement and preventing the tooth flanks from seating correctly. The arrow-mark system prevents assembly error without any measurement instruments or setup gauges.<\/p>\n<\/div>\n

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Step 2 \u2014 Verifying Reference Position (Fig. 4)<\/h3>\n

A V-groove (60\u00b0, 0.3 mm deep) is cut into the tip peripheral of the reference tooth on the duplex worm gear<\/strong>. This groove identifies the one tooth whose position, when aligned with the center of rotation of the worm wheel with the center distance set to the specified value “a,” produces a backlash of approximately \u00b10.045 mm. The V-groove is visible to the naked eye and allows rapid identification without magnification, enabling service technicians to re-establish the zero-backlash position quickly during field maintenance \u2014 the final check before the gearbox is closed and returned to service.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"superiortransmissioninc-products-EP-Duplex<\/p>\n

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Material Specification \u2014 Precision Gear Materials for Duplex Worm Drives<\/h2>\n

Material selection for a duplex worm gear<\/strong> is stricter than for a standard worm gear, because the near-zero backlash specification depends on the dimensional stability of both worm and wheel tooth flanks over service life. Wear at the flank surfaces directly translates to increased backlash, defeating the purpose of the duplex configuration. What is the best plastic material for gears in lower-load duplex worm applications? For precision drives, the material hierarchy runs from phosphor bronze (highest load, best dimensional stability) through nylon worm gear variants down to plastic worm wheel configurations for the lightest precision instrument applications.<\/p>\n

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Worm (Screw) \u2014 Case-Hardened Steel, Ground<\/h3>\n

The conical duplex worm is manufactured from case-hardened steel \u2014 typically 20CrMnTi or equivalent \u2014 ground to the required conical thread profile after hardening. Case hardening produces a hard surface layer (58\u201362 HRC) over a tough core, giving the worm thread wear resistance to maintain dimensional integrity over the high sliding-contact duty of a worm mesh. The precision ground finish achieves Ra \u2264 0.4 \u03bcm required for the near-zero backlash condition to be reproducible across assembled gear sets without selective fitting.<\/p>\n<\/div>\n

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Worm Wheel \u2014 Phosphor Bronze<\/h3>\n

The worm wheel is hobbed from phosphor bronze (CuSn10P or equivalent), which provides low friction against hardened steel, adequate compressive strength (yield strength approximately 200 MPa), and good conformability at the mesh interface. Phosphor bronze’s lower hardness allows the wheel tooth to conform under initial running-in loads \u2014 bringing the contact patch to its full design area \u2014 while remaining dimensionally stable under sustained rated load. Bronze worm wheel production for precision drives is the established material standard globally for the duplex worm gear<\/strong> worm wheel.<\/p>\n<\/div>\n

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Polymer Option \u2014 Nylon and POM for Lightweight Variants<\/h3>\n

For lighter-duty precision applications \u2014 scientific instrument drives, optical positioners \u2014 a nylon worm gear or plastic worm wheel variant can be specified. A nylon worm wheel against a hardened steel conical worm provides adequate wear resistance for intermittent, low-load duty while offering lubricant-free operation and lower weight. POM (Polyacetal) offers better dimensional stability than nylon in small-bore configurations, making it the preferred plastic worm drive wheel material where bore tolerance maintenance is critical across the temperature range. All material grades are processed under our ISO 9001:2015 certified QMS.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Application Scenarios \u2014 Where Duplex Worm Gears Are Specified<\/h2>\n

Le duplex worm gear<\/strong> is not a general-purpose drive component. Its engineering justification is specific: applications where the backlash of a standard worm gear is the binding constraint on system performance and where periodic re-adjustment over service life is preferable to component replacement.<\/p>\n

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CNC Machine Tool Rotary Tables<\/h3>\n

CNC machining centre rotary tables and 4th\/5th axis units require positioning accuracy below 0.05\u00b0 and backlash well below 0.1 mm to meet dimensional tolerances of aerospace and automotive precision machining. The duplex worm gear<\/strong> with eccentric hub adjustment or conical worm axial shift is the standard drive configuration for these tables \u2014 used in machine tool factories across Germany, Japan, South Korea, and Canada where tight angular positioning is a production baseline requirement.<\/p>\n<\/div>\n

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Precision Indexing and Dividing Heads<\/h3>\n

Indexing fixtures, dividing heads, and precision rotary positioners used in gear manufacturing, gear inspection, and multi-axis measurement systems specify the duplex worm gear<\/strong> for its ability to maintain angular positioning repeatability over tens of thousands of indexing cycles. The field-adjustable backlash specification means the dividing head can be returned to original accuracy after extended service without a workshop overhaul \u2014 a practical benefit for production environments in the UK, Australia, and Southeast Asia.<\/p>\n<\/div>\n

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Telescope and Astronomical Instrument Drives<\/h3>\n

Telescope equatorial mount drives and observatory tracking systems use System Ott dual half-worm duplex worm gear<\/strong> configurations to achieve near-zero positional uncertainty needed for long-exposure astrophotography. A standard worm gear with 0.1 mm backlash would produce visible star trailing in long exposures. System Ott eliminates this, and the adjustment mechanism allows field recalibration when temperature changes affect center distance \u2014 a real operational requirement for outdoor observatory equipment in variable-climate locations.<\/p>\n<\/div>\n

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Coordinate Measuring Machines (CMM)<\/h3>\n

CMM rotary axes require the drive stage to introduce zero lost motion into the measurement loop. The duplex worm gear<\/strong> with dual disk wheel adjustment is used in CMM rotary positioning stages where the worm shaft is motor-mounted and adjustment must come from the wheel side. The V-groove reference tooth system allows calibration traceability to be maintained across service intervals \u2014 an important requirement for metrology equipment in ISO\/IEC 17025 accredited laboratories.<\/p>\n<\/div>\n

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Radar Antenna and Satellite Positioners<\/h3>\n

Military and civil radar antenna drives and satellite dish positioners use duplex worm gear<\/strong> drives for high reduction ratio, self-locking position hold, and adjustable near-zero backlash that prevents antenna hunting in closed-loop control systems. The field-adjustable design is particularly valuable for remote antenna installations in Canada, Australia, and the Middle East where full gearbox replacement represents a major logistics cost.<\/p>\n<\/div>\n

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Medical Imaging and Radiotherapy Equipment<\/h3>\n

Radiotherapy gantry rotation drives and medical imaging positioning systems use precision duplex worm gear<\/strong> stages because positioning error translates directly to clinical risk. The \u00b10.045 mm backlash specification backed by ISO 9001:2015 certified production documentation satisfies the dimensional accuracy requirements of medical device drive systems regulated under IEC 60601 and FDA 21 CFR Part 820 frameworks across global markets.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Related Products \u2014 One-Source Drive System Supply<\/h2>\n

Beyond the EP duplex worm gear<\/strong> series, we manufacture complementary drive components that complete a full precision drive train specification \u2014 all traceable to the same ISO 9001:2015 certified quality system.<\/p>\n

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Engrenage \u00e0 double h\u00e9lice<\/a><\/h3>\n

In multi-stage drive trains where a duplex worm gear<\/strong> stage handles the final right-angle high-ratio reduction, a double helical gear stage is often used upstream to handle the first speed reduction from the prime mover at higher efficiency. The opposing helix angles of the double helical gear cancel axial thrust, keeping upstream shaft bearings simple while delivering load capacity at the motor-adjacent stage. Our double helical gear series is dimensionally compatible with the EP drive system portfolio, supporting single-supplier procurement for the complete drive chain.<\/p>\n

\"double<\/div>\n<\/div>\n
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Porte-bagages\u00a0<\/a><\/h3>\n

Where the rotary output of a duplex worm gear<\/strong> reduction stage drives a linear axis \u2014 as in a CNC table linear feed axis or gantry system \u2014 our gear rack series provides the matching pinion-to-rack interface at the output. Metric module racks in steel, stainless steel, and engineering polymer grades are available across module sizes compatible with the pinion spur gear driven by the worm wheel output shaft. Single-supplier sourcing of both the precision worm stage and the linear output stage simplifies qualification documentation and incoming inspection management for precision machine builders.<\/p>\n

\"gear<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Order and Trade Information<\/h2>\n
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Minimum Order Quantity<\/h3>\n

Standard duplex worm gear sets carry a baseline MOQ. Mixed configurations \u2014 different adjustment methods, worm hands, or wheel tooth counts \u2014 can be combined into a single order totalling approximately USD 1,500. For engineering evaluation and first-article qualification, 1\u20135 pcs samples are available at sample pricing. Very small orders of 1\u20132 pcs for prototype or spare requirements can be assessed individually, with per-unit cost higher at sub-baseline quantities.<\/p>\n<\/div>\n

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Lead Time<\/h3>\n

Standard catalogued duplex worm gear configurations: 10\u201325 working days. High-precision ground worm variants or custom center distance specifications: 30\u201360 working days. Custom OEM configurations from customer drawing: 20\u201345 working days. Sample and first-article orders (1\u20135 pcs): 7\u201325 working days, with complex or high-precision configurations assessed individually before lead time confirmation.<\/p>\n<\/div>\n

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Incoterms and Payment<\/h3>\n

Standard component orders: EXW, FOB, CIF, and DAP available. Samples and urgent spare parts: EXW \/ FCA \/ DAP \/ courier service. FCA, CFR, CPT, CIP, and DDP negotiable for established procurement programmes. Payment: T\/T and L\/C both accepted. Packing: precision gear sets individually protected in cartons with cushioning; wooden packing available for bulk orders.<\/p>\n<\/div>\n

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OEM \/ Custom Programme<\/h3>\n

Full OEM and custom duplex worm gear production from customer engineering drawings or physical samples. MOQ for custom configurations depends on module, material, precision class, and adjustment mechanism. Drawing approval precedes production release. Full dimensional and material certification documentation, including worm conicity parameter verification, is provided at delivery for every custom batch to support machine tool and medical device OEM qualification requirements.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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About Our Precision Drive Manufacturing Capability<\/h2>\n

With over ten years of specialised expertise in precision mechanical power transmission, our facility produces a full range of industrial drive components under a single ISO 9001:2015 certified quality management framework. Our manufacturing portfolio spans agricultural gearboxes, worm gear reducers, planetary drive systems, power take-off shafts, hydraulic cylinders, drive chains, gears of all types, and industrial motors \u2014 each designed and built in-house with traceable dimensional documentation.<\/p>\n

On the structural side we produce gearbox housings and assemblies in ductile iron, grey cast iron, cast steel, precision cast steel, and cast aluminium. Our component range includes gears, sprockets, worm gears, pulleys, shafts, and worms in standard and non-standard configurations. For the EP duplex worm gear<\/strong> series, we operate CNC worm grinding equipment capable of the precision ground thread surface (Ra \u2264 0.4 \u03bcm) required for the \u00b10.045 mm backlash specification, with conical worm geometry verified by dimensional inspection documented in the delivery certification package.<\/p>\n

Direct factory supply \u2014 no intermediary trading layer \u2014 keeps procurement lead times competitive and documentation packages complete for customers qualifying our products into regulated supply chains in Germany, Japan, South Korea, Canada, Australia, and the UK.<\/p>\n

Atelier<\/h3>\n
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Foire aux questions<\/h2>\n
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\nWhat is a duplex worm gear and why is it specified instead of a standard worm gear for CNC rotary tables and precision indexing equipment in Germany or Japan?<\/summary>\n
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UN duplex worm gear<\/strong> uses a conical worm whose thread thickness varies axially, allowing the backlash of the worm drive to be adjusted to near-zero (\u00b10.045 mm) by shifting the worm axially or rotating an eccentric hub. This is specified instead of a standard cylindrical worm gear for CNC rotary tables and indexing equipment in Germany and Japan because standard worm gear sets have inherent tooth flank clearance that appears as angular positioning error \u2014 typically 0.05\u00b0 to 0.3\u00b0 depending on manufacturing tolerance class. At that level of lost motion, positioning repeatability for precision machining and inspection operations is unacceptable. The duplex configuration maintains the compact footprint and self-locking property of the worm gear format while eliminating the backlash that limits standard worm drives to lower-precision applications.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nCan a worm gear go both directions, and does the duplex adjustment mechanism work equally for clockwise and counterclockwise drive in industrial automation applications in Canada or Australia?<\/summary>\n
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Yes \u2014 a worm gear can drive in both rotational directions, determined by motor direction and the worm thread hand (right-hand or left-hand). The duplex worm gear<\/strong> adjustment mechanism is direction-neutral and eliminates backlash equally in both drive directions. System Ott in particular contacts both tooth flanks simultaneously, so backlash is eliminated whether the drive reverses from clockwise to counterclockwise or vice versa. For industrial automation drives in Canada and Australia that cycle direction frequently \u2014 robotic joints, servo-driven precision positioning tables \u2014 this bidirectional backlash elimination is exactly what makes the duplex worm gear the correct selection over standard worm gear reducers.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nWhat are the disadvantages of duplex worm gears compared to standard worm drives, and when is the additional complexity justified for precision machine tool applications in the UK or South Korea?<\/summary>\n
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The principal disadvantages of a duplex worm gear<\/strong> compared to a standard cylindrical worm drive are higher manufacturing cost (precision ground conical worm vs standard hobbed cylindrical worm), more complex assembly requiring orientation arrow verification and reference tooth positioning, and the need for periodic re-adjustment as tooth wear gradually increases backlash. For standard industrial conveyor or gearbox drives in the UK or South Korea where backlash of 0.1\u20130.5 mm is entirely acceptable, none of these costs are justified. The additional investment is warranted only when the application’s positioning accuracy requirement falls inside the backlash limit of a standard worm gear: CNC rotary axes, precision dividing heads, telescope drives, and medical positioning equipment are the clear cases.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nHow do I correctly assemble a duplex worm gear set to achieve the near-zero backlash specification for a precision rotary positioning stage in a metrology or medical device manufacturing environment?<\/summary>\n
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Correct assembly of a duplex worm gear<\/strong> set requires two verification steps in sequence. First, orient the worm and worm wheel so that the arrow stamped on the worm wheel front face points in the same direction as the arrow on the worm shaft \u2014 if the arrows disagree, the center distance will be incorrect and proper tooth engagement will not occur. Second, identify the reference tooth using the V-groove (60\u00b0, 0.3 mm deep) on the worm tooth tip peripheral, and position this reference tooth in alignment with the center of rotation of the worm wheel with the center distance set to the specified value “a.” With the reference tooth in this position, the gear set achieves the \u00b10.045 mm near-zero backlash specification without further measurement. For metrology and medical device applications, this assembly procedure should be documented as part of the device build record to support ISO 9001 and regulatory quality system requirements.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nWhere can I source a reliable duplex worm gear supplier who can provide custom worm configurations with OEM documentation for machine tool or precision instrument programmes in Germany, Japan, or Canada?<\/summary>\n
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For machine tool, precision instrument, or medical device OEM programmes in Germany, Japan, or Canada requiring a duplex worm gear<\/strong> with custom module, worm hand, wheel tooth count, or adjustment mechanism, the supplier qualifications to confirm are: ISO 9001:2015 certification with documented precision gear grinding capability, ability to supply the \u00b10.045 mm backlash specification with dimensional verification at delivery, and availability of material certificates for both the hardened steel worm and the bronze or polymer worm wheel. Our EP series meets all three requirements. We accept customer engineering drawings or physical samples for OEM reverse engineering, with a drawing approval step before production release. Standard lead time for catalogued configurations is 10\u201325 working days; custom high-precision ground configurations run 30\u201360 working days. Sample orders of 1\u20135 pcs are available for first-article qualification and backlash measurement verification before production commitment.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n

 <\/p>\n

\u00c9diteur : PXY<\/p>","protected":false},"excerpt":{"rendered":"

The EP-Duplex Worm Gear series is engineered for high-precision transmission systems requiring adjustable backlash and zero-clearance operation. Featuring a unique dual-lead design, these gears allow for precise center distance adjustment via axial shifting of the conical worm or rotation of an eccentric hub. Assembly is simplified with stamped orientation arrows on both the worm and wheel to ensure correct alignment, while a reference V-groove (60\u00b0, 0.3mm deep) on the tooth tip facilitates accurate positioning for near-zero backlash (\u00b10.045). Available in configurations like the split-worm (System Ott) or split-wheel designs, they offer superior load capacity and rigidity. Ideal for CNC machines, rotary tables, and precision instruments, EP-Duplex Worm Gears ensure smooth, backlash-free performance in demanding applications.<\/p>","protected":false},"featured_media":2015,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[71],"product_tag":[],"class_list":["post-2014","product","type-product","status-publish","has-post-thumbnail","product_cat-worm-gear","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/superiortransmissioninc.com\/fr\/wp-json\/wp\/v2\/product\/2014","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/superiortransmissioninc.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/superiortransmissioninc.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/fr\/wp-json\/wp\/v2\/media\/2015"}],"wp:attachment":[{"href":"https:\/\/superiortransmissioninc.com\/fr\/wp-json\/wp\/v2\/media?parent=2014"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/fr\/wp-json\/wp\/v2\/product_brand?post=2014"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/fr\/wp-json\/wp\/v2\/product_cat?post=2014"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/fr\/wp-json\/wp\/v2\/product_tag?post=2014"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}