- Joined
- Dec 22, 2015
- Messages
- 561
I wanted to make a hex ER40 collet block and mounted a piece of mystery steel in the RT chuck, with TS support but I couldn't take very many cuts before the end mill was dull. I have 2 - 3/4" HSS end mills and dulled both of them in only a few short passes on this stuff. I resharpened both and tried again with the same results. I can't get 3 - 0.025" DOC passes over this short piece before the end mill is dull again. Here are a couple of pics.
First one is of the first 0.025" with a freshly sharpened end mill.
this one is of the 3rd 0.025" pass (ie a total DOC of 0.075") and I couldn't finish it.
I turned this stuff down from some 2 1/2" rusty round bar and it didn't seem to be unusually hard. Yet I can't mill the stuff. Any ideas?
First one is of the first 0.025" with a freshly sharpened end mill.
this one is of the 3rd 0.025" pass (ie a total DOC of 0.075") and I couldn't finish it.
I turned this stuff down from some 2 1/2" rusty round bar and it didn't seem to be unusually hard. Yet I can't mill the stuff. Any ideas?