Gears and transmission
Sportster Swingarm Assembly
- Bounding box
- 271.8 × 638.1 × 124.9 mm
- Engine
- Precision B-rep
- Parameters
- 35
- Published
- August 7, 2026
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The prompt
Create a complete, fully detailed 3D CAD model of a 2008 Harley-Davidson Sportster swingarm. Construct from heavy-wall tubular steel finished in semi-gloss black powder coating with visible, precise robotic TIG weld beads at all joining intersections. 1. FRONT PIVOT TUBE & CHASSIS INTERFACE: - Core Component: One horizontal cylindrical front pivot barrel tube measuring exactly 240mm long. - Interior Geometry: Completely hollow with a through-bore diameter of exactly 1.0 inch (25.4mm) to fit a stock pivot axle. - Reinforcements: Two triangular steel gusset plates welded underneath where the side rails meet the pivot tube for frame stability. 2. ASYMMETRIC MAIN RUNNER TUBES: - Dimensions: Structural round tubing with a 1.25-inch outer diameter and a 0.125-inch wall thickness. - Geometry: Symmetrical width tapering outward to a rear internal axle block spacing of exactly 195mm. - Left-Side Tube Profile: Includes a 12mm outward clearance bend to provide operating room for the 1-inch final drive belt and rear sprocket pulley. - Right-Side Tube Profile: Straight runner tube tracking directly from the pivot gusset to the right axle plate. 3. REAR AXLE TRACK BLOCKS & ADJUSTERS: - Core Component: Two vertical solid steel rectangular axle blocks welded to the rear ends of the main tubes. Each block is 16mm thick, 80mm long, and 52mm high. - Adjustment Slot: A horizontal slotted cutout running down the center of each block, exactly 25.1mm high to accept a 25mm rear wheel axle, allowing 2 inches of horizontal sliding adjustment travel. - Tension Assembly: A threaded adjuster bolt channel drilled horizontally through the rear face of each axle block, terminating in an integrated hex locknut assembly for belt tension tracking. 4. SUSPENSION & BRAKE HARDWARE ARCHITECTURE: - Shock Mounts: Two dual-plate vertical clevis brackets welded to the top face of both runner tubes, positioned exactly 70mm forward of the axle slots. Each tab features a 0.5-inch inner pass-through mounting eyelet hole. - Brake Anchor: An integrated horizontal solid steel slide track welded to the inner right runner arm, measuring 8mm wide and 45mm long, serving as the anti-rotation keyway for the rear brake caliper bracket. - Line Guides: Three small, hollow cylindrical loop clips welded along the top of the right-side runner arm for brake line routing. - Belt Guard Bracket: A flat, vertical rectangular tab with a single threaded hole welded to the bottom midpoint of the left runner arm to secure the lower belt guard. 5. ENGINE COMPATIBILITY & OUTPUT: - Structural Constraint: This is a factory-spec dual-shock cruiser swingarm assembly. Do not include monoshock linkage mounts, under-slung rocker pockets, or sportbike-style bracing structures. - Presentation: High-fidelity hard surface modeling. Output geometry with clean topological flow ready for STEP, IGES, and STL conversion.
Parameters
| Name | Value | Range |
|---|---|---|
| Pivot tube OD | 38.1 mm | 30 – 50 |
| Pivot tube length | 240 mm | 200 – 300 |
| Pivot bore diameter | 25.4 mm | 20 – 30 |
| Runner tube OD | 31.75 mm | 25 – 40 |
| Runner wall thickness | 3.18 mm | 1 – 5 |
| Runner length | 520 mm | 400 – 600 |
| Left runner outward bend | 12 mm | 0 – 20 |
| Gusset plate length (Y) | 80 mm | 50 – 120 |
| Gusset plate height (Z) | 50 mm | 30 – 80 |
| Gusset plate thickness | 6 mm | 3 – 10 |
| Axle block thickness (X) | 16 mm | 10 – 25 |
| Axle block length (Y) | 80 mm | 60 – 100 |
| Axle block height (Z) | 52 mm | 40 – 70 |
| Inner spacing between blocks | 195 mm | 160 – 220 |
| Axle slot height | 25.1 mm | 20 – 30 |
| Axle adjustment travel | 50.8 mm | 30 – 60 |
| Adjuster hole diameter | 10 mm | 6 – 14 |
| Adjuster hole depth | 30 mm | 15 – 50 |
| Clevis forward offset from axle | 70 mm | 50 – 100 |
| Clevis tab thickness | 6 mm | 3 – 10 |
| Gap between clevis tabs | 12 mm | 8 – 20 |
| Clevis tab height above tube | 40 mm | 30 – 60 |
| Clevis tab depth (Y) | 25 mm | 20 – 40 |
| Clevis eyelet hole diameter | 12.7 mm | 8 – 16 |
| Brake track width (Z) | 8 mm | 5 – 15 |
| Brake track length (Y) | 45 mm | 30 – 60 |
| Brake track inward protrusion | 10 mm | 5 – 20 |
| Brake track Y position from runner start | 350 mm | 100 – 500 |
| Brake clip outer diameter | 10 mm | 6 – 14 |
| Brake clip inner diameter | 8 mm | 4 – 10 |
| Brake clip length | 12 mm | 8 – 20 |
| Belt guard tab thickness (X) | 4 mm | 2 – 8 |
| Belt guard tab width (Y) | 30 mm | 20 – 40 |
| Belt guard tab height (Z) | 15 mm | 10 – 25 |
| Belt guard hole diameter | 6 mm | 3 – 10 |
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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