[patnok]

I have this choice of inserts on hand:
CNMG-432-TF IC807 iscar
CNMG-432-PP IC9250 iscar
CNMG-432 TCN55 interstate

roughing If I get it to break the chips it burns up inserts, if too slow it makes razor wire.....tried all these inserts (gonna use the interstates they were cheap $5 each)
HAAS SL-10 going .25" deep on 11/16" rod
gotta make 1000's of them. need to find a "balance"
Any advise welcome.

[garylb]

I have this choice of inserts on hand:
CNMG-432-TF IC807 iscar
CNMG-432-PP IC9250 iscar
CNMG-432 TCN55 interstate

roughing If I get it to break the chips it burns up inserts, if too slow it makes razor wire.....tried all these inserts (gonna use the interstates they were cheap $5 each)
HAAS SL-10 going .25" deep on 11/16" rod
gotta make 1000's of them. need to find a "balance"
Any advise welcome.

i had the same problem cutting alloy steel which machines similar to stainless, i now use a kennametal insert at 200 m/min with 0.15 mm/rev feed and 1.25mm depth of cuts and it chips off easy now! I think the trick is to take small cuts and increase the feed until it chips

[patnok]

what grade insert so i can cross reference. I'm getting maybe 25 parts per edge. :drowning: 100 per insert. I'm gonna translate your feeds tomorrow & try it.

thanks

[patnok]

addendum: what is the difference between M1 & M2 inserts?????????

[gizmo_454]

I use a Mitsubishi CNMG431-SA in grade US735. Start it around 330sfm and 0.004-0.005" per rev. Personally, having used our SL-10 on lots of stainless, I wouldn't try 0.25" per side. At that speed and feed, I wouldn't go any more than 0.1" DOC. We run these in 303, 304, 316, and 316L @ 32 HRC. 303 and 304 can run a little faster than the 316, but 330 sfm is a good starting point.

Good luck!

Mike

[patnok]

i'm going .035 DoC ....making razor wire

[littlerob]

@ .25 the DOC is too much, if their burning up they aren't staying cool. @ .035 the chip can't curl over and break, hence the stringers. Use a .1 DOC and a feedrate around .015. Your SFM at 300 is fine, (maybe a little slow). Tool life will just need to be T&E.

Robert

[garylb]

i use kennametal grade kc5010 which is the universal grade but does the job well!
try a 0.050" doc and feed as fast as you can. 0.035 is probably a bit too small but it may still chip if you wack the feed up!

[gizmo_454]

I don't personally think an SL-10 will push 0.100" DOC and 0.015" per rev. At least, not in stainless. Usually in steel, at 0.100" DOC and 0.006-0.008" per rev pulls 80-90% on our SL-10's spindle load meter. My point here, is not to debate what the SL-10 is, or is not capable of, but to help with the situation. So let's get to it...

What are the starting and finishing diameters? If you are only taking 0.035" DOC because that is all you need to remove for the part to be to size, I would recommend going to a smaller tool nose radius like 0.016". That will help. I have also found that using an insert like a DCMT 31.51, will help break the chip up, cut freer, and generally give a shinier finish for the lighter DOC. My favorite so far, again from Mitsubishi, is that style of insert in grade US7020 and their MV breaker running at about 500sfm and 0.003-0.004" per rev.

One way or the other, a little more information is needed to be able to help completely. Starting size, finishing size, and length of turned segment are good info to have.

Mike

[patnok]

Doing better today 330sfm & F.0045 .07 deep. I'll try the .05 doc & speeding up the feed tomorrow. Still making razor wire. Also redirected the coolant so it is spraying up at the cutting point. That seemed to also help. Better tool life, 50secs off the 10 part cycle time so I'm gainin' on it. Now if I could only get chips & not strings.........

thanks for all the help

[patnok]

Starting dia. is .6875. finish dia. is .372. turning down 2" 304ss

[KenFoulks]

Are you using a tail stock, what is the length of cut?

I recommend the CNMG-432-TF IC807 at 600 SFM, .014 IPM, .07 DOC

[KenFoulks]

Here is the tech info on the insert. Assuming your SL-10 has a max spindle speed of 6000 RPM, 600 SFM is max at your smallest diameter.

[patnok]

so you saying max the "clamp" rpms @ 6000 (max on sl-10) & run 600sfm?

[littlerob]

600 SFM at .687 Diameter is NOT 6000 RPM it is 3335. Did I miss something?

[KenFoulks]

Starting dia. is .6875. finish dia. is .372. turning down 2" 304ss

.372 is the smallest diameter, at that size at max RPM is 600 SFM.

[patnok]

I should have confessed that I am/was a mill guy. I'm still trying to wrap my head around this surface feed (S###) & and it's relation to feed rate (F.00##). My main issue is breaking the chips. I'm getting about 100-120pcs per $5 insert now (the iscar is what $20?). That's ok. The razor wire I could do without.
thanks for the input I'm gonna try that 6grand stuff tomorrow.

[littlerob]

You're right my fault I missed that.

[Matt@RFR]

I should have confessed that I am/was a mill guy. I'm still trying to wrap my head around this surface feed (S###) & and it's relation to feed rate (F.00##).

You should be programming in inches per revolution (IPR), so feedrate stays constant no matter the RPM. It only looks like it's feeding faster as SFM goes up.

main issue is breaking the chips. I'm getting about 100-120pcs per $5 insert now (the iscar is what $20?). That's ok. The razor wire I could do without.
thanks for the input I'm gonna try that 6grand stuff tomorrow.

Maybe using $5 inserts is part of your problem. Do you use $10 1/2" endmills in the mills?

[patnok]

The high dollar iscar fared no better. so I figured if i'm gonna burn up inserts they're gonna be the cheap ones! almost done with this batch. I'll school up some more before the next. Thanks for all the input on this & my next post will be how to.........