Ground Helical Gear — Module 3 & 4

Whether you are upgrading a CNC machining centre on a factory floor in Birmingham, integrating precision drives into an automated conveyor in Manchester, or sourcing replacement gears for robotics in London, the Ground Helical Gear Module 3 & 4 delivers the dimensional accuracy and surface finish that demanding UK engineering applications require. These gears are designed to transmit torque smoothly with reduced noise and vibration — a direct result of the helical tooth geometry and the final gear-grinding operation that brings every tooth flank to a mirror-quality surface.

The helical angle of 19°31’42” is carefully chosen to balance axial thrust with torque-carrying capacity, making these ground helical gears a reliable choice for multi-stage gearboxes, servo-driven linear systems, and precision indexing tables used across British manufacturing, aerospace component production, and pharmaceutical packaging lines.

Gear-Ground Finish

Each tooth flank is processed through a final gear-grinding operation, achieving surface roughness values that reduce friction, extend service life, and dramatically lower running noise — essential for precision CNC environments across UK factories.

Premium Alloy Steel

40Cr steel delivers excellent tensile strength and impact resistance for moderate-to-heavy loads, while 20CrMnTi is specified for applications demanding superior case depth and core toughness — both materials selected specifically to handle demanding load cycles without fatigue failure.

DIN6 Grade 5 Precision

Manufactured to DIN6 international Grade 5 standards, these ground helical gears provide repeatable tooth spacing accuracy and minimal runout, which translates into consistent positioning performance in servo-driven or CNC-controlled axis applications used in robotics and automation.

Dual Hardening Options

HRC 48–55 via induction hardening suits general industrial power transmission, while the HRC 55–60 carburising route provides exceptional contact fatigue resistance for high-cycle, high-load scenarios — giving UK specifiers the flexibility to match the gear to the actual duty cycle rather than over-engineering every application.

Optimised Helix Angle

The 19°31’42” helix angle is not arbitrary — it provides the ideal balance between smooth tooth engagement and manageable axial thrust force, reducing bearing loading on the shaft while still achieving the load-sharing benefits that separate helical gears from straight-cut alternatives in high-speed drive trains.

Custom Configurations

Standard catalogue items ship promptly, but our engineering team also supports fully bespoke configurations — modified bore diameters, altered keyway positions, specific tooth counts, or surface coating requirements — all tailored to the exact drawings or performance specifications you supply.

Unlike spur gears that engage along a single line of contact, ground helical gears engage progressively as the teeth wrap around the gear blank at the helix angle. This gradual engagement distributes the load across multiple teeth simultaneously, resulting in quieter operation, less vibration transfer into the machine structure, and higher torque capacity for a given module size. In UK factory environments — where noise-at-work regulations under the Control of Noise at Work Regulations 2005 are enforced — the acoustic advantage of helical gearing is a practical compliance benefit, not just an engineering nicety.

The manufacturing sequence begins with high-quality bar stock of either 40Cr or 20CrMnTi alloy steel, selected for their hardenability profiles and machinability. After rough turning and hobbing, heat treatment is applied: induction hardening (HRC 48–55) creates a hard surface layer while preserving a tough core, whereas carburising (HRC 55–60) diffuses carbon into the surface to a carefully controlled case depth before quenching. Both routes are followed by finish gear grinding, which corrects any distortion introduced during heat treatment and brings the tooth profile back to DIN6 Grade 5 accuracy. The result is a ground helical gear that retains its precision under real operating temperatures and loads — a critical requirement for continuous-duty industrial drives.

These ground helical gears see active use in: CNC machining centres (X/Y/Z axis drives), automated packaging machinery, robotic joint drives, industrial conveyor reduction stages, and agricultural machinery gearboxes across England, Scotland, and Wales. Their compatibility with standard rack systems also makes them ideal for linear motion applications — pairing naturally with a V-Type Ground Helical Guide Rack or a Rectangular Guide Rail to form a complete precision linear drive system.

“We trialled the Module 4 ground helical gears on a robotic palletising cell at our logistics centre in Leeds. The noise reduction compared to our old hobbed gears was immediately noticeable on the factory floor. After eight months of three-shift operation, there is no measurable wear on the tooth flanks. We’ve since standardised these gears across four additional robot axes.”

“Our pharmaceutical packaging line in Hertfordshire required very low backlash and minimal vibration transmission into the tablet counting heads. The YMCL303282 ground helical gears met our specification exactly — DIN6 Grade 5 with verified surface finish documentation. The supplier provided a full material certificate without prompting, which satisfied our GMP validation requirements without any back-and-forth.”

“We source Module 3 ground helical gears for the axis drives on our plasma cutting tables in Glasgow. Competitive quote, accurate dimensional inspection report shipped with every batch, and the custom bore diameters we requested were machined to tolerance on first delivery. Turnaround time from order to receipt in Scotland was well within our project schedule.”

Our manufacturing facility operates a fully integrated production line covering raw material inspection, bar turning, gear hobbing, heat treatment, and computer-controlled gear grinding on Klingelnberg and Gleason platforms. Every finished ground helical gear passes through dimensional inspection using Zeiss coordinate measuring machines, and gear accuracy is reported to full DIN6 Grade 5 tolerance stacks — not just pitch error alone. Material traceability records are maintained from bar stock to shipment, providing the documentation chain that UK customers in aerospace, medical devices, and defence supply chains regularly require.

Beyond catalogue items, our product customisation service handles: non-standard bore diameters and keyway orientations, modified face widths, alternative helix angles for specific axial thrust requirements, shaft extensions, flange integration, black oxide or zinc-phosphate surface protection, and bespoke module / tooth-count combinations that are not listed in the standard range. Engineering drawings in DXF, DWG, STEP, or IGES format are accepted directly, and our applications engineering team will review your specification within one working day to provide a manufacturability assessment and indicative lead time before you commit to an order.

Custom Order Capabilities

• ✓ Non-standard bore & keyway
• ✓ Bespoke module & tooth count
• ✓ Modified face width
• ✓ Alternate helix angles
• ✓ Surface coating options
• ✓ Full material traceability
• ✓ DXF / STEP drawing accepted

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