Re: 316 stainless

tlipton2@xxxxxxxxxxx wrote: 
Hi Steve,

I am making the assumption that this is straight turning
non-interrupted cutting. 

Yup.

And your DOC is a radius.

Yup

I would suggest you 
switch to a more wear resistant grade like 1025 or 1525. If your edge
is actually wearing away and not failing because of a built up edge
then switching to a more wear resistant grade should help.  Drop your
feedrate a little if you switch grades.


I have available CNMG-432 PR grade 4035
                 CNMG-432 QM grade 4015

The only 1525 available (in house) is a PF geometry.

Also have TCMP?(single sided)-433 UR grade 4025



You might try using a roughing tool for ripping off the main part of
the stock and a finishing tool for a light final pass if you not
already doing that.

Already doing that, using a CNMG-432 in a S05 grade for finishing. .03 D.O.C.


The feed and speed numbers that are given on the insert package
represent a calculated cutting life of 20 minutes of actual cutting
time. Sounds like you got pretty close to the theorectical.

If you go through the math and look at the total cost for 128 parts its
still better to change the insert more often at the higher feedrate.

I made these assumptions,
10 min = 18 pcs Higher rate  (1 used insert edge)
18 min = 18 pcs Slower rate  ( 1 used insert edge) You didn't say how
many parts were completed at the lower feedrate.
Insert edge change 5 min
15 pcs per edge (safe)
Insert cost $3.75 per edge ($15 insert cost)
Shop rate at $100/Hr

High feedrate comes in at $240 total cost for 128 pcs
Low feedrate comes in at $333 total cost for 128 pcs.

The Sandvik tech help is excellent. So lean on these guys.
1-800-726-3845

In a perfect world one edge would do all the parts which is what I
always wish for. I hate to babysit a machine to change tools.

That's my problem. It's a gantry fed double spindle Mazak. I need to get 128 pcs before the rougher fails. I may have to go to a tool life grouping, but I hate to because the off shift derelicts (I mean operators) don't understand much but change the roughers every pallet.

I prefer 
a stable running machine myself. It allows me to do my work in parallel
which the math here does not take into account. I will take a guy doing
two jobs at once over one job at once any day.

Hope this helps

Tom Lipton


Thanks.

--
Steve Walker
res6nlr2@xxxxxxxxxxxxxxxxx (remove wallet to reply)
.