Update on Pocket NC v2-50 Threadmilling
After machining a fair number of parts with threads, I’ve tweaked my thread milling feeds and speeds to both go a little bit faster, give a more reasonable fit, and remove the last bit of niggling interference with the M2.5 recipe.
I’ll list the changes here, and have updated the original recipe
| Old | New | |
|---|---|---|
| Chamfer Width | 0.10mm | 0.05mm |
| M3 Pitch Diameter Offset | 0.538mm | 0.568mm |
| M3 Stepovers | 10 | 6 |
| M3 Repeat Passes | NO | YES |
| M3 Lead To Center | NO | YES |
| M2.5 Pitch Diameter Offset | 0.430mm | 0.480mm |
| M2.5 Stock to Leave | 0.0mm | -0.02mm |
| M2.5 Stepovers | 7 | 4 |
| M2.5 Repeat Passes | NO | YES |
| M2.5 Lead To Center | NO | YES |
Notably, the “Lead To Center” option found on the linking tab is what prevents the M2.5 threads from rubbing when inserting in later passes. Thanks to Quincy Jones from Implemented Robotics for that tip over in the mjbots discord!