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.
Development Notes ...
- while heat-setting M4 inserts in for the rollers, (1) there isn't really enough space to get the soldering iron in (without melting the adjacent pla) and (2) it's difficult to guarantee these go in straight. maybe use a press-in insert? / a hex nut ?
- long runs (beams) are not stiff ... try 1/8" waterjet stiffening folded members
BOM for N17
| Type | Size | QTY | Where Used | Vendor | PN |
|---|---|---|---|---|---|
| Flat Head Thread-Forming | No. 6, 1/2" | 12 | - | McMaster | 95893A255 |
| Flat Head Thread-Forming | No. 6, 3/4" | 8 | - | McMaster | 95893A258 |
| Bearing Shims | 5x10x0.5mm | 22 | - | McMaster | 98089A331 |
| Shoulder Bolts | 5x10xM4 | 2 | Pulleys | McMaster | 92981A030 |
| Shoulder Bolts | 5x6xM4 | 8 | Rollers | McMaster | 92981A146 |
| Heat-Set M4 Tapered Inserts | M4 | 10 | - | McMaster | 94180A351 |
| Heat-Set M3 Tapered Insert | M3 | 5 | - | McMaster | 94180A331 |
| M3 SHCS | 10mm Long | 4 | Motor Mounting | McMaster | 91292A113 |
| M3 SHCS | 14mm Long | 5 | Tensioning and Tuning | McMaster | 91292A027 |
| M3 Washers | - | 9 | 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