Commit abfdf597 authored by Jake Read's avatar Jake Read
Browse files

add n17

parent aba145d5
......@@ -36,41 +36,33 @@ Make sure to change 'type' to .step, and check the 'save to my computer' box. No
## Gantry for NEMA17 Motor, 0.25" ALU
~ ongoing ~
- last rites before building a machine is to 3dp a new set of blocks and re-build that gantry on your desk. test it w/ new circuits and invent cable management that works real good.
### BOM for N17
625ZZ bearings are 5x16x5mm [VXB 20](
Bearing Shims are 5x10x0.5mm (McMaster, 18-8)
Shoulder Bolts are 5x6xM4 mostly and 5x10xM4 at the pulleys.
Pulleys are 10mm GT2 (try to find steel-core GT2)
Belt Pinion is 20T (speed!) or 12T (resolution!)
Uses many Heat-Set Tapered Inserts, M3 (94180A331) and M4 (94180A351).
Smaller Gantries. Uses 45* bearings in 3DP blocks, with one set riding on flexures for smooth preloaded motion. Cut rail on WJ with high cut quality.
### Notes from the First Build
Increased preload from 0.2 to 0.4mm
A few fitting things ... motor mounts get lots more clearance
Increased sizes for heat-set inserts to make overflow smaller.
Overall, pretty good. Could do with some more allowance around the 'reachover' ... recall the M4 Heat-Set Insert for the 'vertical' constraining bearing pushes PLA into the through-hole for its 'option-retaining' shcs.
Ostensibly easy to cut on a laser with 1/4" Acrylic for very-easy machine-making.
Might want to replace all M3 Heat-Set Inserts with Plastic Hardware.
This is ready to be applied in the [Little Rascal]( [(see also)]( project. My last thoughts are:
- could abandond servo-belt type, not enough motor torque to overcome friction at this size. re-up on that for N23, with steel belts, for milling and other higher force applications.
- in abandoning this, belt tensioning becomes easy: make simple, small stops and apply tension at the motor. become smaller.
- I would be interested in a motor-hanging-from-end-of-plate flying belt type at this size, for very fast applications (lasers).
Mounting Blocks-Into-Plate wants a 3.5mm M3 through hole, and counter-sinks. Flat heads into countersunk holes helps overconstrain the finnicky plastic blocks. 10mm length black-oxide seems best.
Plastic is heavy.
Added 1mm more space between the two blocks to try to eliminate the backlash I found in the planar direction. (i.e. in displacements not-normal to the rail).
It seems to run pretty well, wants to be pre-loaded into the 0.5mm range.
### BOM for N17
At the end of the day, they're not a *whole lot* smaller than the N23s.
Type | Size | QTY | Where Used | Vendor | PN
--- | --- | --- | --- | --- | ---
Flat Head Thread-Forming | No. 6, 1/2" | 20 | - | McMaster | 95893A255
Bearing Shims | 5x10x0.5mm | 22 | - | McMaster | 98089A375
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 | 1 | - | McMaster | 94180A331
Various M3 SHCS | - | 5 | - | - | -
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](
## Gantry for NEMA23 Motor, 0.375" HDPE
This diff is collapsed.
This diff is collapsed.
This diff is collapsed.
This diff is collapsed.
This diff is collapsed.
This diff is collapsed.
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment