On 6/5/2018 4:59 PM, Howard Beel wrote:

"Terry Coombs" wrote in message
news
I ended up using my one homemade indexable end mill , only took 2
triangular inserts . What worked was to lock the rotary table in
position and using the end of the mill to do the cutting . Average
depth of cut was around .015" per pass , cranking slow in X . I first
tried locking down both axes and advancing the RT one hole (in a 47
hole plate) at a time . That calculated out to about .003" feed per
hole . Full depth cuts , and that didn't work so well . I didn't make
a killin' on this , but learned a little more about machining hard
materials . I gotta say , I felt very pessimistic about this whole
thing when an M42 end mill just skated on the part . Delivered them
today and found out it took 20 years to cause the damage , this
should give him 20 more - and this was their only option , parts are
no longer available .

--
Â*Snag
Yes , I'm old
and crochety .
Get off my lawn !


Next time you need to machine hardened material try ceramic
inserts. They will cut material that carbide won't scratch.

Best Regards
Tom.

---

Â* Thanks for the tip , Tom . This isn't really a business for me , more
of a hobby . Occasionally someone calls me and says "Can you ..." and
I'll usually say sure , I can try !


--
Snag
Yes , I'm old
and crochety .
Get off my lawn !