Commit aba145d5 authored by Jake Read's avatar Jake Read

upd8 N17

parent 06e09b92
......@@ -38,27 +38,40 @@ Make sure to change 'type' to .step, and check the 'save to my computer' box. No
~ ongoing ~
-42.3 mm - ( 6.5 * 2 ) * 1 mm
- 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.
https://www.vxb.com/20-625ZZ-5x16x5-Metal-5mm-Bore-Miniature-p/kit250.htm
![n17sofar](images/n17-blocks.jpg)
Flat Heads
- 20mm for reach-thru on motor runner
- ? there are more ?
![n17sofar](images/n17-assem.jpg)
- holes in plate
- wj plate
- wire organizer test, plate feet
### BOM for N17
- 3dpnext
- wj
- do we have belts, do we have pulleys, order bearings, last mcmaster, admirals, etc, close it out and next up we do software problems
625ZZ bearings are 5x16x5mm [VXB 20](https://www.vxb.com/20-625ZZ-5x16x5-Metal-5mm-Bore-Miniature-p/kit250.htm)
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).
### 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.
Might want to replace all M3 Heat-Set Inserts with Plastic Hardware.
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.
At the end of the day, they're not a *whole lot* smaller than the N23s.
## Gantry for NEMA23 Motor, 0.375" HDPE
![RCTN23-0375HDPE](images/RCTN23-hdpe-img.jpg)
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