1/4" Diameter Alloy Steel Regular (3XD-5XD): 3/4" LOC and Below. Here are the recommended End Mills as well as Speeds and Feeds for the Optimized Tool Path (like a VoluMill, DynamicMill or iMachining) in Alloy Steels like 4140, 4340 or 8620:
1/4" Diameter x 3/4" Length of Cut x 5 Flute Alcrona Pro Coated Variable Pitch End Mill
| Axial DOC |
3/4" and Below |
| Radial DOC |
.025" |
| SFM |
500 |
| RPM |
7,640 |
| CLPT |
.0035" |
| IPM |
133.7 |
| Metal Removal Rate |
2.50 |
*Do not use these Speeds/Feeds if you are not running an Optimized Tool Path
