Gears and transmission
12T Spur Gear with Hub and Cross Pin Hole
- Bounding box
- 10.3 × 10.3 × 12.0 mm
- Engine
- Precision B-rep
- Parameters
- 9
- Published
- September 30, 2026
Download
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The prompt
Create this part using simple sequential CAD operations. STEP 1 — GEAR Create ONE closed planar 12-tooth spur gear profile on the XY plane at Z=0. - 12 teeth - Module: 0.75 mm - Pressure angle: 20° provisional - Pitch diameter: Ø9.00 mm - Outside diameter: Ø10.50 mm - Root diameter: Ø7.30 mm - All profile geometry must lie exactly at Z=0. - Profile must be closed, planar and non-self-intersecting. - Extrude 7.53 mm along +Z. STEP 2 — HUB Create a centered Ø9.00 mm cylindrical hub from Z=7.53 to Z=12.00 mm. Hub extension = 4.47 mm. Use a sharp shoulder at Z=7.53 mm. Fuse gear and hub into ONE solid. STEP 3 — AXIAL BORE Cut a centered Ø5.00 mm through-bore along the Z axis through the complete 12.00 mm length. STEP 4 — TRANSVERSE PIN HOLE Create ONE Ø2.25 mm diametrical through-hole through the hub. Hole axis: X axis. Hole centerline: Y = 0 Z = 9.055 mm The hole must pass through both sides of the hub and intersect the Ø5.00 mm axial bore. The nearest edge of the Ø2.25 mm hole must be 0.40 mm from the shoulder at Z=7.53 mm. IMPORTANT ANGULAR POSITION: Clock/rotate the 12-tooth gear around the Z axis so the transverse pin-hole openings are centered directly beneath TWO OPPOSITE TOOTH VALLEYS (root spaces), NOT beneath tooth centers. Because there are 12 teeth, the opposite pin-hole opening must also align with the opposite valley, 180° away. Looking along the Z axis, the X-axis transverse-hole centerline must pass through the centerline of two opposite tooth valleys. Do NOT position either pin-hole opening beneath a tooth. The hole is located in the HUB below the valley. It must NOT cut through the gear teeth or root valley itself. FINAL: - 12 teeth / 12 valleys - Pin-hole openings aligned beneath two opposite VALLEYS - Ø10.50 outside diameter - Ø9.00 pitch diameter - Ø7.30 root diameter - 7.53 mm gear width - Ø9.00 hub OD - 4.47 mm hub extension - 12.00 mm overall length - Ø5.00 axial through-bore - ONE Ø2.25 mm transverse through-hole - One connected solid Do not change any specified dimension.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 0.75 mm | 0.3 – 2 |
| Number of Teeth | 12 teeth | 6 – 48 |
| Gear Face Width | 7.53 mm | 2 – 20 |
| Gear Clocking (valley on X) | 15 deg | 0 – 30 |
| Hub Diameter | 9 mm | 6 – 16 |
| Hub Extension | 4.47 mm | 1 – 20 |
| Axial Bore Diameter | 5 mm | 1 – 8 |
| Pin Hole Diameter | 2.25 mm | 0.5 – 4 |
| Pin Hole Axis Height (Z) | 9.06 mm | 8 – 11.5 |
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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