- Feb 22, 2020
- Reaction score
Silver steel seems to be pretty good at hardening without excessive distortion in smaller diameters, as you would use for D-bits. That's what I'm making my camshaft from. You harden by heating it cherry red then quenching in water or oil, then temper it at around 200 degrees Celsius.
I plan to do the finish machining using CBN tooling on the lathe and mill, followed by polishing. We shall see how that goes on my pathetically small and non rigid mill, but on the lathe I've even been able to turn down HSS tool bits using CBN.
when I mentioned CBN I meant as a grinding wheel abrasive, yes you can turn hardened steel and I've even done it with carbide, but crankshafts and camshafts are generally too flexible to cut reliably as the deflection you'll get with the force required to make a cut will result in a very out-of-round and non-concentric set of journals. so the best way to finish a crankshaft or camshaft after hardening is with grinding, and since I've had bad results with alumina (doesn't wear evenly, and the parts I was making were too small to allow me to traverse the grinding wheel back and forth during grinding), and diamond isn't compatible with steel (as I understand it, could be wrong, someone enlighten me), so CBN seems like the next alternative to try.