- Mar 5, 2020
- Reaction score
I did consider using silver steel (drill rod) but the sizes available where far from ideal. The steel is also much harder to machine on my little CNC mill. Being a small mill I don't use pumped coolant which also becomes an issue when trying for a good surface finish. Should I have uses silver steel then I would have dropped the temper and would have tried to keep a higher temper at the rocker/valve interface - possible but tricky.