Process Conditions
Shown are the suggested ranges for cutting speeds and feed rates using high speed tool steel under dry cutting conditions at a 0.015 in. depth of cut. Generally cutting speeds are lower for hard materials, higher for soft materials. Both cutting speeds and feed rates can be substantially increased when coolants are used and carbide tooling is substituted for steel tooling. Typical Speeds and Feeds
| Workpiece Material | Hardness (Hardness Brinell scale) | Cutting Speed (sfpm) | Feed Rate (ipt) |
|---|---|---|---|
| Aluminum | 70 to 125 | 300 to 500 | 0.006 to 0.010 |
| Brass | 60 to 100 | 110 to 275 | 0.007 to 0.009 |
| Cast Iron | 250 to 320 | 30 to 55 | 0.005 to 0.006 |
| Mild Steel | 275 to 325 | 60 to 80 | 0.006 |
| Stainless Steel | 275 to 325 | 40 to 55 | 0.006 |
| Plastics | ... | 150 to 350 | 0.006 |
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