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Gantry for NEMA17 Motor, 0.25" Stock, Pinion-Type Belt
STATUS: up to date, works well, feels good, not measured for stiffness or straightness etc.
USED IN: Little Rascal
Smaller Gantries. Uses 45* bearings in 3DP blocks, with one set riding on flexures for smooth preloaded motion. Cut aluminum or steel rail on WJ with high cut quality, or cut acrylic on laser. 0.25" or similar (6.35mm) stock assumed.
shoulder bolts can be substituted for fabricated bushings
s/o to Rahul in Kerala for this example:
BOM for N17
| Type | Size | QTY | Where Used | Vendor | PN |
|---|---|---|---|---|---|
| Flat Head Thread-Forming | No. 6, 1/2" | 20 | Most Plastic Fasteners | McMaster | 95893A255 |
| Bearing Shims | 5x10x0.5mm | 22 | Adjacent Every Bearing | McMaster | 98089A331 |
| Shoulder Bolts | 5x10xM4 | 2 | Pulleys | McMaster | 92981A030 |
| Shoulder Bolts | 5x6xM4 | 8 | Rollers | McMaster | 92981A146 |
| Heat-Set M4 Tapered Inserts | M4 | 10 | Anchors for Sholder Bolts into Plastic Parts | McMaster | 94180A351 |
| Heat-Set M3 Tapered Insert | M3 | 3 | Threads for M3 Screws to Adjust Motor Tension and Bearing Preload | McMaster | 94180A331 |
| M3 SHCS | 10mm Long | 4 | Motor Mounting | McMaster | 91292A113 |
| M3 SHCS | 14mm Long | 2 | Bearing Preloading | McMaster | 91292A027 |
| M3 SHCS | 20mm Long | 1 | Tensioning Pulley | McMaster | 91292A027 |
| M3 Washers | - | 7 | Screws without Washers are Sad Screws | McMaster | 93475A210 |
| M4 SHCS | 20mm Long | 4 | Belt Mounting | McMaster | 91292A121 |
| M4 Washers | - | 4 | ibid | McMaster | 93475A230 |
| 625ZZ Bearings | 5x16x5mm | 12 | - | VXB | link or McMaster 6153K113 |
| 20T or 16T GT2 Pulley | 10mm or Wider, 5mm Bore | 1 | - | Amazon or SDP/SI | Amazon Link |
| 10mm (or 9mm) Wide GT2 Belt | Find Steel-Core for Stiffness! | 1 | - | Amazon or SDP/SI | Amazon Link |
Materials for N17
1/4" Acrylic from McMaster, for 12x24" for small lasers pick 8505K755
1/4" ALU 6061 Typical (6.35mm)