Pete Deal
Titanium
- Joined
- Apr 10, 2007
- Location
- Morgantown, WV
I have a few parts (6) to make from Nitronic 60. Each has a 10-24 threaded hole .375" deep thread. I need to do some mill work on them anyway so i figured I would thread mill them. I wonder if any of you that are very adept at thread milling would check my numbers before I snap it off.
Cutter: single thread form, .135" od, 3 flute.
Hole: #25 (.1495")
I see 150 sfm recommended so I will be running about 4200 rpm.
.0003" per tooth is also recommended. On the straight this would be about 3.8 ipm.
Planning on .004" per pass. This seems like a lot to me but looking at various online references they seem to recommend less passes than I have.
Since my first cut will be .004 in a .1495 hole I used .158" as the outer diameter and calculated the feed as follows:
Programmed Feed = 3.8ipm x (.158-.135)/.158 = .55ipm.
Cutter: single thread form, .135" od, 3 flute.
Hole: #25 (.1495")
I see 150 sfm recommended so I will be running about 4200 rpm.
.0003" per tooth is also recommended. On the straight this would be about 3.8 ipm.
Planning on .004" per pass. This seems like a lot to me but looking at various online references they seem to recommend less passes than I have.
Since my first cut will be .004 in a .1495 hole I used .158" as the outer diameter and calculated the feed as follows:
Programmed Feed = 3.8ipm x (.158-.135)/.158 = .55ipm.