Unlocking Smooth Performance for High-Torque & Speed Builds

What Are Helical Gears?

Helical gears feature teeth cut at an angle (less than 90 dAegrees) to the gear axis. Unlike straight-cut gears, this design enables gradual tooth engagement, resulting in:

• Up to 40% more surface contact between meshing gears
• Significantly reuced noise and vibration
• Smoother power transfer under load
• Enhanced durability for high-stress setups

In airsoft, helical gears solve a critical pain point: balancing high-stress setups (e.g., DMRs) with silent operation—a key focus for Jvan Airsoft technical builds.

Why Use Helical Gears in Airsoft?

Torque Applications (Primary Use Case)

• Ideal for M150-M170 spring setups and DMR builds
• Gear ratios optimized for torque multiplication:
• 100:200 (≈24:1 ratio)
• 100:300 (≈36:1 ratio)
• Handles piston pre-engagement better than straight-cut gears

Critical Installation Differences: Helical vs. Straight-Cut Gears

Shimming: Precision Is Non-Negotiable

1.Contact Area Matters

• Target 80-90% tooth engagement (visually verify through bushing holes)
• <60% contact causes grinding, heat buildup, and failure

2.Side-to-Side Play Control

• Helical gears generate axial thrust forces during operation
• Allow <0.1mm lateral movement (tighter than straight-cut gears)
• Loose shimming causes gear "walking" and premature wear

Final Validation:

• Spin test (gears must rotate freely with grease)
• Auditory check: Hissing = good; Grinding = critical failure
• Current draw test (<25A on 30k motor)

Pro Tips from Jvan Airsoft

1.Greasing Protocol:

• Use molybdenum disulfide grease on tooth flanks
• Avoid lithium grease (attracts dirt)

2.Compatibility Notes:

• No specialized pistons or pinions needed for
• Works with standard V2/V3 gearboxes

3.Failure Prevention:

• Over-shimming causes binding → Measure gear stack height
• Under-shimming strips teeth → Verify 0.05mm gear-to-bushing clearance

Conclusion: When to Go Helical

Helical gears are viable for:

• ✅ High-torque spring builds (>M150)
• ✅ Stealth-focused replicas
• ✅ High-speed setups (20-30 RPS with quality motors)
• ❌ Avoid if using low-cost gear sets (poor angle consistency causes binding)

Business Development

• Heidi
• JIN WANG METAL(HK) LIMITED
• Whatsapp：+8618103050072
• E-Mail :heidi@hardwareprecision.com