4140

Hi guys, So I know this doesn't sound like a machine thread but I think it actually makes sense to approach the material discussion based on a specific machine. What machines beautifully on a huge CNC with fast, constant surface speed, coolant and carbide tooling may not a a smaller manual...

After few tests ended with this results: SS 304 have gone very well. A36 better than 1020 4140 "same" finish as 1045 and 8640