Cleveland Twist Drill PM Plus Series 538 End Mills

Speed and Feed Recommendations

Note: Series 538 end mills have been designed for heavier than average feed rates. In fact, running them at slower than recommended feed rates can seriously degrade performance. When in doubt, increase feed rates to the maximum capabilities of your machine and fixturing.

Material Uncoated SFM TiCN Coated SFM

Chip Load Per Tooth By Cutting Diameter

1/2" 3/4" 1" 1-1/4" 2"
Aluminum
(Soft/Gummy)
250 - 500 400 - 2,500 .005" .007" .010" .012" .015"
Aircraft Aluminum Alloys (Less Than
10% Silicon)
250 - 750 500 - 3,250 .005" .007" .010" .012" .015"
Aluminum Alloys
(More Than
10% Silicon, Wrought & Cast)
Not Recommended
Copper Alloys (Long Chip) 250 - 500 350 - 1,500 .005" .007" .009" .012" .015"
Copper Alloys (Short Chip) 150 - 250 200 - 1,250 .003" .006" .008" .010" .013"