Machininh skin on cast stainless

[Bruce Caulley]

Ahoy!

 

I have a job from cast H7A Stainless that has a very hard outer skin.

 

Tried being conservative with standard Iscar HOF face mill, but am blowing up too many inserts.

 

Iscar on their way in to have a look, but thought I would ask if anyone has a better method. This part may be on the boundary of using ceramics????

 

Bruce

[crazy^millman]

Ceramics and run it till you think it might blow up then push it harder. That skin could upwards of 60 rc so I would look to that verse carbide.

 

HTH

[Superman]

Bruce,

Iscar will probably push you to these "HELIDOs"

http://www.iscar.com/Ecat/familyhdr.asp/fn.../lang/EN/type/1

 

They are similar to "FF" feedmills but better tip life, more edges and similar feeds / speeds , they start to go downwards when machining near walls, good for open cutting of Ti and 15-5 PH and a few other awkward materials

 

Shallow DOC < 1mm, Hi feed= 1mm per tooth, CS 45mm/min

[Bruce Caulley]

I like the helido and have one of the new style feedmills, but I think I will just leave these faces un-machined. I was only really doing it to save on balancing further down the track, but if it takes half a day to save a couple of hundred $$ it isn't worth it.

 

Might get myself prepared next time with some ceramics or some other idea that comes to mind between now and the next batch.

 

Bruce