Brackets and mounts
Motor + ESC Mount Assembly for 20 mm CF Tube Arm
- Bounding box
- 1212.8 × 381.0 × 53.0 mm
- Engine
- Precision B-rep
- Parameters
- 59
- Published
- October 27, 2026
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The prompt
Design a motor + ESC mount assembly for a 20 mm OD / 18 mm ID carbon-fibre tube arm. Units: mm. Parametric, cleanly named features, STEP export. REFERENCE PARTS (simplified): - Tube: OD 20, ID 18, length 250. - Motor (T-Motor MN4006): cylinder Ø44.35 x 21 tall, 4xM3 holes on [CONFIRM from T-Motor drawing: assume 16 x 16 pattern], shaft Ø4, prop adapter 6. - Prop: 15" disc, Ø381, 5 mm thick, placed above the motor. Used for clearance checks only. - ESC (T-Motor Air 40A): block [ASSUMED 60 x 25 x 12 until datasheet confirmed]. CUSTOM PARTS: 1. Motor clamp, lower half: Al 6061-T6. Saddle of Ø20 H8 for the tube, 2 mm wall, 24 mm long along the tube, 2x M3 clamp screws on the split line (clearance Ø3.4, counterbore for socket head). One M3 cross-hole through the tube axis for the anti-rotation bolt. Top face is a motor plate, 3 mm thick, with 4x M3 tapped holes and a Ø12 centre relief. Add fillets R2 on all outside corners and lightening cut-outs. 2. Motor clamp, upper half: mirrors the lower, with the same M3 cross-hole and clamp-screw bosses. 3. Internal plug: Al 6061, Ø17.9 x 20 long, bonded into the tube end with epoxy. M3 cross-hole, 1 mm wall around it. 4. ESC bracket: clip-on half-clamp on the tube (Ø20), 2x M3 screws, flat pad 60 x 25 with 2 zip-tie slots (3 x 1.5). Located 70 mm inboard of the motor axis, on the side of the tube. Minimum 3 mm air gap under the ESC. FASTENERS (simple models): M3x16 clamp screws (x2), M3x25 cross-bolt with nyloc, M3x6 motor screws (x4). Check head clearance and tool access. ASSEMBLY: place the motor axis at the tube end, perpendicular to the tube. Run an interference/clearance check. Nothing within the 15" prop disc except the motor. Cable path along the underside of the tube, bend radius at least 15 mm. OUTPUTS: assembly + part files, an isometric view, an exploded view, mass of each custom part, dimensioned drawings (material, tolerances, thread callouts), STEP of the full assembly.
Parameters
| Name | Value | Range |
|---|---|---|
| Part Layout Spacing | 120 mm | 40 – 400 |
| Tube OD | 20 mm | 10 – 40 |
| Tube ID | 18 mm | 8 – 38 |
| Tube Length | 250 mm | 50 – 600 |
| Motor Body Diameter | 44.35 mm | 20 – 80 |
| Motor Body Height | 21 mm | 8 – 60 |
| Shaft Diameter | 4 mm | 1 – 10 |
| Shaft Length | 12 mm | 2 – 40 |
| Prop Adapter Diameter | 6 mm | 3 – 20 |
| Prop Adapter Height | 8 mm | 1 – 30 |
| Motor Mount Hole Pitch | 16 mm | 8 – 40 |
| Motor Mount Hole Dia | 3.4 mm | 2 – 8 |
| Propeller Disc Dia | 381 mm | 100 – 600 |
| Propeller Disc Thickness | 5 mm | 1 – 20 |
| ESC Length | 60 mm | 20 – 120 |
| ESC Width | 25 mm | 10 – 60 |
| ESC Height | 12 mm | 3 – 40 |
| Clamp Length Along Tube | 24 mm | 12 – 80 |
| Saddle Wall Thickness | 2 mm | 1 – 8 |
| Motor Plate Thickness | 3 mm | 1.5 – 10 |
| Motor Plate Size X | 40 mm | 15 – 100 |
| Motor Plate Size Y | 40 mm | 15 – 100 |
| Motor Screw Pitch (Sq) | 16 mm | 6 – 40 |
| Motor Screw Tap Drill Dia | 2.5 mm | 1.5 – 6 |
| Centre Relief Dia | 12 mm | 4 – 30 |
| Clamp Screw Clearance Dia | 3.4 mm | 1.5 – 8 |
| Counterbore Dia | 6 mm | 3 – 14 |
| Counterbore Depth | 3 mm | 1 – 10 |
| Clamp Screw Boss Dia | 7 mm | 4 – 20 |
| Clamp Screw Boss Height | 8 mm | 2 – 30 |
| Clamp Screw Offset | 5 mm | 1 – 25 |
| Cross Bolt Hole Dia | 3.4 mm | 1.5 – 10 |
| Cross Bolt Position | 12 mm | 2 – 70 |
| Lightening Cut-out Dia | 4 mm | 1 – 12 |
| Lightening Cut-out X1 | 6 mm | 1 – 70 |
| Lightening Cut-out X2 | 18 mm | 1 – 70 |
| Internal Plug Diameter | 17.9 mm | 5 – 38 |
| Internal Plug Length | 20 mm | 5 – 80 |
| Plug Cross Hole Dia | 3.4 mm | 1.5 – 10 |
| Plug Cross Hole Position | 10 mm | 1 – 70 |
| ESC Clamp Length | 30 mm | 10 – 90 |
| ESC Pad Length | 60 mm | 20 – 120 |
| ESC Pad Width | 25 mm | 10 – 60 |
| ESC Pad Thickness | 3 mm | 1 – 10 |
| ESC Clamp Screw Dia | 3.4 mm | 1.5 – 8 |
| ESC Screw X1 | 5 mm | 1 – 80 |
| ESC Screw X2 | 25 mm | 1 – 80 |
| Zip-Tie Slot Length | 3 mm | 1 – 10 |
| Zip-Tie Slot Width | 1.5 mm | 0.5 – 5 |
| Zip-Tie Slot Spacing | 20 mm | 4 – 80 |
| Screw Shank Dia (M3) | 3 mm | 1 – 8 |
| Screw Head Dia | 5.5 mm | 2 – 16 |
| Clamp Screw Head Height | 3 mm | 1 – 10 |
| Clamp Screw Length (M3x16) | 16 mm | 4 – 60 |
| Cross Bolt Length (M3x25) | 25 mm | 6 – 80 |
| Nyloc Nut Across Flats | 5.5 mm | 2 – 20 |
| Nyloc Nut Height | 2.4 mm | 1 – 12 |
| Motor Screw Head Height | 3 mm | 1 – 10 |
| Motor Screw Length (M3x6) | 6 mm | 2 – 30 |
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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