{"id":1397,"date":"2026-06-15T03:26:03","date_gmt":"2026-06-15T03:26:03","guid":{"rendered":"https:\/\/worm-shaft.com\/?post_type=product&p=1397"},"modified":"2026-06-15T07:13:26","modified_gmt":"2026-06-15T07:13:26","slug":"duplex-worms-gear","status":"publish","type":"product","link":"https:\/\/worm-shaft.com\/de\/produkt\/duplex-worms-gear\/","title":{"rendered":"Duplex Worms Gear"},"content":{"rendered":"
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Precision Motion Control<\/div>\n

Duplex Worm Gear \u2014 Zero-Backlash Precision Worm Drive Solutions<\/h2>\n

Engineering-grade duplex worm gear sets engineered for UK and global B2B industries demanding repeatable positional accuracy, minimal backlash, and long-term load reliability. Supplied from our certified manufacturing facility with full customisation capability.<\/p>\n

Get a Quote<\/a>
\nView Specifications<\/a><\/div>\n<\/div>\n<\/div>\n

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\"Duplex<\/div>\n<\/div>\n<\/div>\n

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Need a custom duplex worm gear for your UK application?<\/span>
\nSend Enquiry \u2192<\/a><\/div>\n

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

\"DuplexA duplex worm gear \u2014 sometimes called a dual-lead worm gear \u2014 is a precision worm gear set where the left and right flanks of the worm thread are intentionally manufactured with slightly different modules and diameter quotients. This engineering choice means the two tooth profiles carry distinct lead angles, causing tooth thickness to increase continuously from one end of the worm to the other, while the gap between threads decreases correspondingly. The practical result is a mechanism that gives the design engineer precise, continuous control over backlash \u2014 without compromising contact geometry, load capacity, or transmission efficiency.<\/p>\n

Unlike conventional worm gears that rely on eccentric hubs, conical worm axial shifts, or split-wheel arrangements to manage backlash, the duplex worm gear method is geometrically clean. Backlash adjustment is achieved simply by shifting the worm axially until the section carrying the required tooth thickness engages with the worm wheel \u2014 no geometric distortion of the contact zone, no changes to meshing interference thresholds, and no reduction in the load-bearing area. This preserves the evolved contact profile that makes worm gears so effective at transmitting high torque across a compact, 90-degree shaft arrangement.<\/p>\n

At the worm wheel, the different modules on each side produce different addendum modification coefficients and different rolling circle diameters per flank. The tooth thickness and gap width remain constant around the wheel’s circumference, making the wheel itself straightforward to inspect and replace. This asymmetry between worm and wheel is the fundamental working principle behind the duplex system’s ability to deliver zero or near-zero backlash in demanding applications like CNC rotary tables, precision milling machines, and servo-controlled press equipment across UK manufacturing facilities.<\/p>\n<\/div>\n

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Technical Specification \u2014 Duplex Worm Gear Design<\/h2>\n
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\"Fig.1<\/p>\n

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FIG. 1<\/span><\/p>\n

Axial worm shifting adjusts backlash by positioning the correct tooth-thickness section in contact with the worm wheel \u2014 no geometric distortion occurs.<\/p>\n<\/div>\n<\/div>\n

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\"Fig.2<\/p>\n

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FIG. 2<\/span><\/p>\n

Alternative backlash methods \u2014 conical worm shift, split-worm, split-wheel \u2014 all introduce geometric compromise. The duplex method avoids these entirely.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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How the Duplex Worm Gear Works \u2014 Principle, Material and Assembly<\/h2>\n

The operating principle of the duplex worm gear<\/a> rests on a simple but powerful geometric insight: if you manufacture the two thread flanks with marginally different modules, you produce a worm whose tooth thickness varies continuously along its length. When this worm is paired with a correctly matched duplex worm wheel, the assembly allows for precise backlash setting through nothing more than an axial position shift. Moving the worm toward the thicker-tooth end reduces backlash; moving it toward the thinner end opens the clearance. The engineer can set any desired backlash value at initial mounting and re-adjust it as the gear set wears \u2014 without disturbing the involute contact geometry, without changing the centre distance, and without introducing any interference between mating teeth.<\/p>\n

Correct assembly is critical. Both the worm and the worm wheel carry an orientation arrow stamped into the component body; these two arrows must align in the same direction when the set is assembled. Incorrect orientation causes the effective centre distance to increase beyond the design value, making precise mesh impossible and risking damage to both components. A V-groove reference mark (60\u00b0 included angle, 0.3 mm deep) is cut into the tip of the reference tooth on the worm. When this marked tooth is positioned directly in line with the worm wheel’s centre of rotation at the nominal centre distance, the gear set achieves its designed near-zero backlash of \u00b10.045 mm.<\/p>\n

Material selection is matched to the application. Worm shafts are produced in hardened alloy steel \u2014 typically case-hardened to a surface hardness of 58\u201362 HRC \u2014 giving the worm thread excellent wear resistance under the high sliding velocities inherent in worm gear contact. Worm wheels are cast or forged in phosphor bronze or high-tin brass alloys, which provide the self-lubricating properties needed to manage the sliding contact between dissimilar metals while preserving surface finish over millions of operating cycles. For particularly demanding UK applications such as heavy-duty tilting tables or continuous-cycle press operations, our engineering team can specify alternative materials including ductile iron or nickel-aluminium bronze to achieve the required fatigue life.<\/p>\n

\"Duplex<\/p>\n

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Primary Application Scenarios<\/h3>\n
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\u2699<\/div>\n
CNC Rotary Tables<\/div>\n
Servo-driven indexing demands bidirectional positioning with no lost motion. Duplex worm gears eliminate angular error from backlash at every reversal.<\/div>\n<\/div>\n
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\ud83d\udd27<\/div>\n
Milling Machines<\/div>\n
Table feed drives on horizontal and vertical mills benefit from zero-backlash transmission, preventing chatter and improving surface finish on cut components.<\/div>\n<\/div>\n
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\u26e4<\/div>\n
Tilting Tables<\/div>\n
Angular positioning under varying load, including impulse-loaded workpiece engagement, is managed reliably without gear set damage or positional drift.<\/div>\n<\/div>\n
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\ud83d\udd27<\/div>\n
Precision Presses<\/div>\n
Alternating contact flank conditions in press drives are handled cleanly; the duplex design prevents start-up wear spikes that plague conventional adjustment methods.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Why Duplex Worm Gears Outperform Conventional Solutions<\/h2>\n

Every alternative backlash control method \u2014 eccentric hub rotation, conical worm shifting, split worm halves, split wheel discs \u2014 shares a common flaw: each adjustment moves the contact zone away from the geometrically optimum position. The result is a smaller contact patch, reduced load-carrying capacity, lower transmission efficiency, and measurable start-up wear every time the setting is changed. In high-cycle UK manufacturing operations, that wear cost compounds into significant unplanned maintenance. The duplex worm gear sidesteps all of this because its backlash control mechanism is geometrically neutral: the contact area, efficiency, and tooth stress distribution remain unchanged across the full adjustment range.<\/p>\n

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\u2713 Geometrically Accurate Contact<\/div>\n
Backlash adjustment never alters the evolved contact area. Load-carrying capacity and transmission efficiency remain at their designed values throughout the gear’s service life.<\/div>\n<\/div>\n
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\u2713 Adjustable Even After Wear<\/div>\n
Worn gear sets can be readjusted continuously and delicately without component replacement, reducing downtime and total cost of ownership for UK machine builders and end users alike.<\/div>\n<\/div>\n
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\u2713 Centre Distance Tolerance<\/div>\n
Because teeth are executed in involute form, the gear set is insensitive to small centre distance changes caused by worm shaft deflection under load \u2014 a real benefit in large frame machines.<\/div>\n<\/div>\n
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\u2713 Zero Start-Up Wear Penalty<\/div>\n
Competing methods introduce accelerated wear at every re-adjustment. The axial-shift duplex method causes no additional wear event during or after adjustment.<\/div>\n<\/div>\n
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\u2713 Bidirectional Precision<\/div>\n
Suitable wherever contact flanks alternate, making duplex worm gears ideal for reversing drives in presses, positioning axes, and servo-controlled rotary systems.<\/div>\n<\/div>\n
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\u2713 Custom Ratios and Dimensions<\/div>\n
Available with reduction ratios from 5:1 to 100:1 and in a wide range of centre distances, with full custom engineering available from our factory for OEM and retrofit requirements.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Customer Success: Real-World Performance<\/h2>\n

The following case study and customer reviews reflect applications where our duplex worm gears have delivered measurable performance improvements in UK and European production environments.<\/p>\n

\"Duplex<\/p>\n

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Case Study<\/div>\n
Precision Engineering \/ CNC Machining \u2014 West Midlands, UK<\/div>\n<\/div>\n

Eliminating Positional Drift on a Five-Axis CNC Rotary Table<\/h3>\n

A West Midlands precision machining firm producing aerospace turbine components had been experiencing angular positional error accumulation in the rotary B-axis of their five-axis CNC machining centre. The existing conventional worm gear drive showed backlash of approximately 0.12 mm at the table rim after 18 months of operation, resulting in rejected parts and costly re-machining cycles. Their maintenance team had repeatedly adjusted the eccentric hub arrangement, but each adjustment introduced a short-lived improvement followed by renewed drift as start-up wear opened the clearance again within weeks.<\/p>\n

They specified a replacement duplex worm gear set from us in a custom centre distance to fit their existing housing. Following installation and axial adjustment to the V-groove reference mark, measured backlash at the table rim was brought to under 0.03 mm. Over the following 14 months of three-shift operation, no further backlash adjustment was required \u2014 and when one was eventually carried out as part of a scheduled service, it was completed in under 20 minutes without removing the gear set from the machine. Part rejection rates on that axis fell by over 90%, and the customer has since specified duplex worm gear sets for two additional machining centres in their facility.<\/p>\n

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Backlash: 0.12 mm \u2192 <0.03 mm<\/div>\n
Part Rejection: \u201190%+<\/div>\n
Adjustment Time: <20 min<\/div>\n<\/div>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“We’ve been using these duplex worm gear sets in our press-brake indexing heads for just over two years. The ability to re-adjust after wear without pulling the entire head apart has saved us several days of downtime we used to budget for annually. The part quality from our engineering team is excellent.”<\/p>\n

James Whitfield<\/div>\n
Production Engineering Manager \u2014 Sheffield, UK (Sheet Metal \/ Press Tooling)<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“We specified a custom duplex worm gear for a high-speed tilting table used in automotive jig welding. Getting a quote was straightforward, delivery was faster than we expected, and the gear set performed exactly as predicted on the bench. We’ve ordered three more since.”<\/p>\n

Marek Kowalski<\/div>\n
Mechanical Design Lead \u2014 Coventry, UK (Automotive Jig & Fixture Manufacture)<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“The supplier’s engineering support was what set them apart. We needed a non-standard reduction ratio and an extended worm shaft to fit our milling machine’s existing gearbox housing. They came back with a complete proposal, including centre distance and mounting recommendations. Zero-backlash operation confirmed on first run.”<\/p>\n

Dr. Sarah Hutchinson<\/div>\n
Chief Engineer \u2014 Bristol, UK (Scientific Instrument \/ Metrology Equipment)<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Manufacturing Capability & Custom Engineering Services<\/h2>\n

Our manufacturing facility operates precision gear-grinding and worm-milling machines calibrated to ISO 1328 accuracy grades, supported by a full metrology suite including CMM and involute gear testers. This infrastructure allows us to deliver standard duplex worm gear sets quickly from stock, while also supporting fully bespoke engineering for OEM, retrofit, and research applications. UK B2B customers frequently approach us with non-standard requirements: unusual centre distances, specific reduction ratios not in the standard range, custom shaft extensions, special flange mounting configurations, or material upgrades for corrosive or elevated-temperature environments. Our application engineers work directly with your design team to confirm compatibility and specify the optimum duplex worm gear solution.<\/p>\n

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\"Ever<\/p>\n

WORKSHOP \u2014 PRECISION GEAR GRINDING<\/span><\/div>\n<\/div>\n
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\"Ever<\/p>\n

WORKSHOP \u2014 QUALITY INSPECTION & METROLOGY<\/span><\/div>\n<\/div>\n<\/div>\n
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Our Custom Duplex Worm Gear Capabilities<\/h3>\n
\u2713 Custom Centre Distances<\/span>
\n\u2713 Non-Standard Reduction Ratios<\/span>
\n\u2713 Special Shaft Extensions<\/span>
\n\u2713 Custom Flange Mounting<\/span>
\n\u2713 Alternative Materials (NiAlBronze, Ductile Iron)<\/span>
\n\u2713 Surface Treatment Options<\/span>
\n\u2713 OEM & Retrofit Supply<\/span>
\n\u2713 Full Technical Documentation<\/span><\/div>\n

Get a Quote for Your Custom Requirement<\/a><\/p>\n<\/div>\n<\/div>\n

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Frequently Asked Questions<\/h2>\n
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\n\u25b6<\/span> What is the difference between a duplex worm gear and a standard worm gear, and which one should I choose for a precision CNC rotary table in the UK?<\/summary>\n
A duplex worm gear has two flanks manufactured with different modules, allowing backlash to be adjusted by axially shifting the worm without disturbing the contact geometry. A standard worm gear uses fixed tooth profiles and requires eccentric hubs or other compromising methods to control backlash. For a precision CNC rotary table in the UK where bidirectional positioning accuracy is critical, a duplex worm gear is the preferred choice \u2014 it maintains its contact area and efficiency regardless of where the backlash is set.<\/div>\n<\/details>\n
\n\u25b6<\/span> How much does a custom duplex worm gear set cost, and how do I get a price from a UK-ready supplier?<\/summary>\n
The cost of a duplex worm gear set depends on the centre distance, reduction ratio, materials, and any custom machining requirements such as special shaft extensions or non-standard flanges. To receive an accurate quote, contact our team at sales@cardancoupling.top<\/a> with your centre distance, required ratio, shaft dimensions, and any special material or surface finish requirements. We respond to UK B2B enquiries promptly.<\/div>\n<\/details>\n
\n\u25b6<\/span> Where can I find a reliable duplex worm gear supplier that ships to the UK and can handle custom engineering projects?<\/summary>\n
We supply duplex worm gear sets to UK machine builders, OEMs, and end users from our certified manufacturing facility. We handle custom centre distances, non-standard ratios, special shaft configurations, and alternative materials, with full technical documentation and engineering support throughout the project. All units are inspected to ISO 1328 standards before dispatch.<\/div>\n<\/details>\n
\n\u25b6<\/span> How do I adjust the backlash on a duplex worm gear, and will the adjustment affect the tooth contact area or transmission efficiency?<\/summary>\n
Backlash on a duplex worm gear is adjusted simply by shifting the worm axially until the section carrying the required tooth thickness engages the worm wheel. A V-groove mark on the reference tooth provides a clear zero-backlash reference position. Unlike eccentric hub or split-component methods, this axial shift does not displace the contact zone, so load-carrying capacity and transmission efficiency remain at their designed values. Readjustment after wear is equally clean and quick.<\/div>\n<\/details>\n
\n\u25b6<\/span> What industries in the UK typically use duplex worm gears, and what makes them the right choice for precision manufacturing?<\/summary>\n
UK industries that commonly specify duplex worm gears include aerospace machining, automotive jig and fixture manufacture, precision press tooling, scientific instrument production, and medical device manufacture. The combination of zero or near-zero backlash capability, re-adjustability after wear without geometric compromise, and maintained transmission efficiency makes them the preferred choice wherever bidirectional positional accuracy is a quality or regulatory requirement.<\/div>\n<\/details>\n
\n\u25b6<\/span> When should I readjust my duplex worm gear set after extended use in a milling machine application?<\/summary>\n
Readjustment is advisable when measured backlash at the machine axis exceeds the tolerance your process requires \u2014 typically indicated by increased positional error in CNC feedback or visible play during manual dial indicator testing. Duplex worm gears make this readjustment quick and non-invasive: a minor axial shift of the worm, referenced to the V-groove mark, restores the original backlash value without removing the gear set from the machine or disturbing alignment.<\/div>\n<\/details>\n
\n\u25b6<\/span> Which materials are available for duplex worm gear sets, and can the worm wheel be supplied in a corrosion-resistant alloy for a food processing application in the UK?<\/summary>\n
Standard duplex worm gear sets are supplied with a hardened alloy steel worm and a phosphor bronze worm wheel. For food processing and other corrosive or wash-down environments common in UK production facilities, we can specify nickel-aluminium bronze for the wheel and coated or stainless steel for the worm shaft. Please describe your environment and operating duty cycle when requesting a quote, and our engineers will recommend the appropriate material combination.<\/div>\n<\/details>\n<\/div>\n<\/div>\n

<\/p>\n

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Ready to Specify a Duplex Worm Gear for Your UK Application?<\/div>\n

Send us your technical requirements \u2014 centre distance, ratio, shaft configuration, and operating environment \u2014 and receive a detailed engineering proposal with a competitive price from our team.<\/p>\n

Get a Quote \u2192 sales@cardancoupling.top<\/a><\/p>\n

edit by gzl<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Duplex worm gear with zero-backlash axial adjustment. Involute tooth profile, hardened steel worm, phosphor bronze wheel. ISO 1328 certified. Custom ratios 5:1\u2013100:1. UK B2B supply.<\/p>","protected":false},"featured_media":1402,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[5370],"product_tag":[],"class_list":["post-1397","product","type-product","status-publish","has-post-thumbnail","product_cat-worm-gear-shaft","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/product\/1397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/comments?post=1397"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/media\/1402"}],"wp:attachment":[{"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/media?parent=1397"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/product_brand?post=1397"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/product_cat?post=1397"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/worm-shaft.com\/de\/wp-json\/wp\/v2\/product_tag?post=1397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}