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Rack Gear Spec Table
Rack Gear Specifications — 8 sizes
KS B 1401JIS B 1702
A linear gear that meshes with a pinion to convert rotary motion to linear motion. Used in CNC machines, automatic doors, and transfer systems.
Practical Notes
- Rack and pinion module must match. Apply spring-preload design to minimize backlash.
- Joint precision is critical for long strokes. Pitch misalignment at joints causes vibration and noise.
Selection Guide
Converts rotary motion to linear motion. Used in CNC gantries, automatic doors, and linear actuators. Rack and pinion module must match.
Rack GearKSJISRack Gear
4 sizesThe dimensions below are identical across KS B 1401 · JIS B 1702.
| Nominal | m | α | ha | Formula | Use |
|---|---|---|---|---|---|
| M1 Rack | 1 | 20° | 1 | Pitch=πm | Dynamic , CNC |
| M1.5 Rack | 1.5 | 20° | 1.5 | Pitch=πm | Machine Tool Table |
| M2 Rack | 2 | 20° | 2 | Pitch=πm | Large Feed Device |
| M3 Rack | 3 | 20° | 3 | Pitch=πm | Crane, Heavy Equipment |
Key Features
- Straight gear (rack) + pinion combination converts rotary to linear motion and vice versa
- No stroke limit; rack splicing enables unlimited linear travel
- Module 1–10; precision-ground racks achieve cumulative pitch error ±0.02 mm/m
Key Applications
CNC gantry feed, automatic door opening, injection mold movement, machine tool tables, AGV travel drive
FAQ
How to reduce rack-pinion backlash?
Spring-preloaded pinion (spring load on one of dual pinions), split pinion, or rack pressing methods reduce backlash.