Gears and transmission
12T Spur Gear with Hub and Pin Hole
- Bounding box
- 10.3 × 10.3 × 12.0 mm
- Engine
- Precision B-rep
- Parameters
- 12
- Published
- September 30, 2026
Download
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The prompt
Create one solid 12-tooth spur gear with hub and holes. GEAR: - 12 teeth, 30° spacing - Module: 0.75 mm - Pressure angle: 20° - Outside/tooth-tip diameter: Ø10.50 mm - Pitch diameter: Ø9.00 mm - ACTUAL root diameter: exactly Ø7.30 mm - Every tooth valley bottom must lie on radius 3.650 mm. - Ø7.30 mm is the actual physical valley/root diameter, NOT a reference or construction circle. - Gear face width: 7.53 mm - Straight spur teeth - 12 equal teeth and 12 equal open valleys HUB: - Centered hub diameter: Ø9.00 mm - Hub starts at Z = 7.53 mm - Hub ends at Z = 12.00 mm - Hub extension: 4.47 mm - Overall length: 12.00 mm - Sharp gear-to-hub shoulder AXIAL BORE: - Centered Ø5.00 mm through-hole along the main Z axis - Open through the entire 12.00 mm part TRANSVERSE PIN HOLE: - ONE Ø2.25 mm diametrical through-hole along the X axis - Center: Y = 0, Z = 8.755 mm - Must pass through both sides of the hub and intersect the Ø5.00 mm axial bore PIN-HOLE CLEARANCE: - Shoulder: Z = 7.530 mm - Nearest edge of Ø2.25 mm hole: Z = 7.630 mm - Shoulder-to-nearest-hole-edge clearance: exactly 0.100 mm - Hole center: Z = 8.755 mm - Do NOT measure the 0.100 mm to the hole center. ANGULAR ALIGNMENT: Rotate/clock the gear so the X-axis transverse pin hole is centered directly beneath TWO OPPOSITE TOOTH VALLEYS. The pin-hole openings must be beneath valley centerlines, NOT beneath tooth centers. IMPORTANT: Preserve Ø10.50 mm actual tooth-tip diameter. The deepest physical points of all valleys must be exactly radius 3.650 mm, producing Ø7.300 mm actual root diameter. Do not deepen the valleys below R3.650 mm. Create one connected valid solid.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 0.75 mm | 0.3 – 3 |
| Number of Teeth | 12 teeth | 8 – 60 |
| Pressure Angle | 20 deg | 14.5 – 25 |
| Outside / Tip Diameter | 10.5 mm | 4 – 60 |
| Actual Root Diameter | 7.3 mm | 2 – 50 |
| Face Width (tooth length) | 7.53 mm | 1 – 40 |
| Hub Diameter | 9 mm | 3 – 40 |
| Hub Start Z (shoulder) | 7.53 mm | 0.5 – 40 |
| Hub End Z (overall length) | 12 mm | 1 – 60 |
| Axial Bore Diameter | 5 mm | 0.5 – 20 |
| Transverse Pin Hole Diameter | 2.25 mm | 0.3 – 10 |
| Pin Hole Center Z | 8.76 mm | 0.5 – 40 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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