Speeds & feeds
Enter the material, cutter and engagement — you get starting RPM, feed, removal rate and power.
Spindle speed and feed rate
Starting values for an end mill. Enter the engagement too — the feed is corrected for chip thinning and we work out removal rate and power. Then fine-tune by sound and chips.
Starting values for typical end mills; power uses an approximate specific cutting force kc and 80 % efficiency. Always check your cutter maker's catalogue.
ISO 286 fits, ISO 2768 general tolerances and Ra roughness are now in the CAD tools.