Ground Helical Gear — Module 1.5

What Makes This Gear Different?

The Ground Helical Gear Module 1.5 is engineered to DIN6 Grade 5 tolerances, representing a step above standard industrial gearing in both surface finish and dimensional accuracy. Manufactured from high-alloy 40Cr or 20CrMnTi steel, each gear undergoes either high-frequency induction hardening (HRC48–52) or full carburising and quenching (HRC55–60), depending on the application demand. The tooth flanks are then precision ground — a critical final process that removes all heat-treatment distortion, delivering a tooth profile that is geometrically perfect and ready for high-load, low-noise operation.

With a helix angle of 19°31’42”, these helical gears transmit torque gradually across the face width, dramatically reducing impact loading and operational noise compared with straight-cut spur gears. Industries across the United Kingdom — from automated packaging lines in the East Midlands to robotics integrators in the Thames Valley — rely on this geometry for demanding continuous-duty cycles.

Accuracy Grade

DIN6 Gr.5

Module

1.5

Helix Angle

19°31’42”

Material

40Cr / 20CrMnTi

Max Hardness

HRC55–60

Finish Process

Gear Ground

A helical gear’s teeth are cut at an angle to the gear axis — in this case 19°31’42”. As the gear rotates, each tooth engages its mating rack or pinion gradually along the face width rather than in an instantaneous line contact, which is how straight spur gears work. This continuous engagement spreads the load across multiple teeth simultaneously, resulting in smoother torque delivery, considerably lower noise emissions, and dramatically extended fatigue life under cyclic loading conditions.

The ground helical gear process begins with gear hobbing or shaping to rough form, followed by heat treatment. Heat treatment inevitably introduces minor geometric distortion to the tooth flanks. The critical final step — gear grinding — removes this distortion using CNC-controlled abrasive wheels that trace the exact involute profile. The result is a tooth surface accurate to within a few microns, far exceeding what hobbing or shaving alone can achieve. This gear grinding step is precisely why DIN6 Grade 5 is attainable, making this gear suitable for servo-driven precision axes, high-speed indexing tables, and medical or semiconductor equipment where positioning repeatability is paramount.

⚙ CNC Machining Centres

High-speed rack-and-pinion drives on gantry-style machining centres, laser cutting beds, and plasma tables across the UK’s fabrication sector demand the positional accuracy that only gear-ground components can deliver consistently.

🔧 Packaging & Food Lines

Servo-driven filling, sealing, and labelling machines in food manufacturing facilities across Yorkshire and the Midlands use ground helical gears to meet stringent hygienic runout tolerances while maintaining high throughput speeds without excessive noise.

🤖 Robotics & Automation

Collaborative robot (cobot) linear axes, SCARA pick-and-place systems, and automated warehouse solutions increasingly specified in Scotland and the South East rely on the low backlash and predictable transmission error of precision ground helical gearing.

📈 Medical & Life Sciences

OEM equipment builders producing imaging, laboratory automation, and surgical platform systems based in Cambridge and Oxford research corridors rely on DIN6 Grade 5 ground gears for the micron-level repeatability their instruments demand.

🎯

DIN6 Grade 5 Accuracy

Tight tolerance on profile, lead, and pitch errors translates directly to lower backlash and better positioning repeatability in your machine build.

🔊

Low Noise Operation

The helical tooth form distributes contact gradually, reducing impact noise by 6–10 dB compared with spur gears of the same module under equivalent load conditions.

🔥

Superior Wear Resistance

A case-hardened surface at HRC55–60 withstands abrasive wear and adhesive scuffing, extending overhaul intervals and reducing unplanned downtime on production lines.

⚙

Higher Load Capacity

Multi-tooth simultaneous contact spreads bending and contact stress, allowing a smaller module gear to carry loads that would require a larger spur gear, saving space and weight in tight machine envelopes.

📎

Broad Size Range

Twelve standard codes cover bore diameters from 14 mm to 25 mm with face widths from 19 mm to 65 mm, giving specifying engineers the freedom to match the gear to the shaft without compromising on quality grade.

🔄

Drop-In Compatibility

Standardised keyway and bolt-circle dimensions allow direct replacement of worn standard gears without modification to housings, shafts, or existing rack assemblies — minimising retrofit engineering time.

Accuracy Grade

DIN6 International Grade 5

Material

40Cr / 20CrMnTi

Tooth Type

Helical (Right-hand)

Helix Angle

19°31’42”

Hardness Treatment

H.F. Induction HRC48–52° / Full Carburising HRC50–55°

Manufacturing Process

Gear Tooth Surface Ground

Our manufacturing facility operates a dedicated gear grinding division with Reishauer and KAPP-NILES CNC grinding centres, supported by a full in-house heat treatment shop, CMM quality lab, and gear metrology station. This integrated process chain means every ground helical gear leaves our factory with full traceability from raw material certificate to final inspection report. UK procurement teams and engineering managers who have worked with us directly consistently remark on the consistency of our lot-to-lot dimensional accuracy — something that matters enormously when building multi-axis machines where gear interchangeability is required.

Beyond standard catalogue sizes, we offer a comprehensive custom gear manufacturing service tailored to your application’s exact requirements. Whether you need a non-standard bore diameter, a modified tooth count to achieve a specific gear ratio, a bespoke face width, or a special surface coating (black oxide, phosphating, or custom plating), our engineering team can accommodate the request with a lead time competitive with UK-based suppliers. Custom orders can be placed with no minimum order quantity penalty for prototyping runs, making us a practical partner for product development as much as production supply.

📧 Get a Quote for Custom Gears

“

We trialled three suppliers before settling on these ground helical gears for our linear axis drives. The DIN6 accuracy is genuine — our metrology lab verified it on the first batch and every subsequent delivery. Lead times to our Sheffield facility have been reliable, and the technical team responded to our custom bore enquiry faster than any UK distributor we had contacted.

James Thornton

Lead Mechanical Engineer, Precision Machine Tools Ltd — Sheffield, England

“

We supply bespoke packaging automation to the food and beverage sector across Wales and the South West. Noise levels on production floors are a real client concern, and the helical gears from this range have allowed us to quote confidently against noise specifications that our previous spur gear design simply could not meet. The pricing is competitive relative to similar-quality European product, and the minimum order quantities suit our project-by-project procurement model.

Claire Davies

Procurement Manager, SwiftPack Automation Ltd — Bristol, England

“

I specified the YMCL152265 code for a servo rack-and-pinion axis on a semiconductor wafer handling platform we build here in Cambridge. The critical requirement was positional repeatability below 5 microns over a 600 mm stroke. After commissioning with this ground helical gear, we achieved 3.2 microns repeatability — better than our simulation predicted. The inspection certificate and raw material traceability documentation also made our CE compliance process straightforward.

Dr. Ravi Chandrasekaran

R&D Director, NanoMotion Systems Ltd — Cambridge, England