Gear Designer
Create precise involute gears for CNC routers and laser cutters. Supports spur gears, internal gears, and gear racks. Generate matching gear pairs with a shared module.
Configuration
Laser kerf width. Outer contours grow by half the kerf, bores and cutouts shrink — parts come out to size after the cut.
Determines the tooth size
Standard: 20°
Each gear gives up half of it (thinner tooth). Milled 0.05–0.1 mm, lasered usually 0 — the kerf compensation handles it there.
Helps avoid undercut
Spokes
Classic radial spokes with constant width
0 = solid (no spokes)
0 = automatic from bore and spoke width
No design generated
Involute Profile
Precise calculation of the involute tooth profile according to DIN standards. Adjustable pressure angle and profile shift.
Gear Pairs
Create two matching gears with different tooth counts. A shared module guarantees perfect meshing.
Racks & Internal Gears
Generate gear racks for linear drives or internal (ring) gears for planetary gearboxes.
Gear Design Tips
- Module: Determines the tooth size. All gears must share the same module to mesh together. Typical: 0.5-5mm.
- Tooth count: Use at least 6-8 teeth to avoid undercutting. More teeth = larger diameter at the same module.
- Pressure angle: The standard is 20°. Use 14.5° for smoother running, 25° for higher load capacity.
- Profile shift: Can be used to avoid undercutting at low tooth counts (positive shift).
- Material: Wood/MDF for decorative gears, plastic (POM/Delrin) for functional gears, metal for heavy loads.
Key Formulas
Pitch diameter:
d = m × z
Tip diameter:
da = d + 2m
Root diameter:
df = d - 2.5m
Center distance:
a = (d₁ + d₂) / 2
m = module, z = tooth count, d = diameter