Stop guessing your speeds and feeds.
Generic charts and shop-floor rules of thumb are why tools burn up and finishes suffer. The right starting point comes from data tied to the actual tool, material, and cut.
Why it happens — and the fix
1Generic charts that ignore your tool and setup
RobbJack's calculator is built on the company's own tested machining data and returns separate roughing and finishing numbers for your exact tool or for a material and diameter — RPM, feed, chip load, depth of cut, and spindle power.
2Not accounting for rigidity and machine power
The calculator derates the chip load for setup rigidity and caps spindle power, reducing depth of cut (never your RPM or feed) when a cut would overload the machine — so the numbers are usable, not just theoretical.
3Material you've never run before
Pick the material and the engine selects an appropriate tool and starting speeds and feeds — from aluminum (run max RPM) to Inconel (around 100 SFM), with the chip-load-per-tooth math handled for you.
4Slitting saws need their own math
Saws interpolate chip load by blade thickness and follow depth-of-cut rules end mills don't. The calculator has a dedicated slitting-saw mode that even recommends the K-series saw and the right thru-coolant arbor.
The proof
- Roughing + finishing
- separate cards for every result
- End mills + saws
- including hardened-steel die-mold mode
- Print sheet
- take the setup sheet to the machine
Dig deeper
Not sure where to start?
Send us your toughest part. Our application engineers will recommend the tool and the numbers.