1/2" Diameter PH Series Stainless Regular (3XD-5XD): 1-5/8" 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 17-4PH and 15-5 PH (38-42 HRc) and Titanium (6AL4V):

1/2" Diameter x 1-1/2" Length of Cut x 5 Flute Alcrona Pro Coated Variable Pitch End Mill
1/2" Diameter x 1-5/8" Length of Cut x 5 Flute Alcrona Pro Coated Variable Pitch End Mill
| Axial DOC | 1-5/8" and Below |
| Radial DOC | .035" |
| SFM | 300 |
| RPM | 2,292 |
| CLPT | .004" |
| IPM | 45.84 |
| Metal Removal Rate | 2.60 |
*Do not use these Speeds/Feeds if you are not running an Optimized Tool Path
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