can someone give me an idea on how to treat 304 stainless (as far as feeds and speeds and type of endmills)

thanks

mark

Feed it as hard as you dare, and follow the speed charts for your tool. When drilling, do not peck drill. This causes the stainless to work harden.

follow manufacturer specs
hanita varimills are tough and work extremely well , also for drilling i would recommend solid carb drills ,hss is to slow and get dull ,if its a long run then time saved justifies the cost , we have great success with the kennametal drills , we been into serious runs of 316l and ive been more than impressed with how many holes we get out of a drill

what kinds of feeds and speeds do you use on the carbide drills? I have been machining the profile with solid carbide and mills with great results. .625 carbide em 4 flute at 1631 rpm feed 13.4. I have burnt up a few drills (hss). I will try carbide but any reccomdation on feed/speed. I could not even find a website with reccomended f/s. Thanks

Mark

btw I am doing #7 holes to tap and .25 through holes.

follow manufacturer specs
hanita varimills are tough and work extremely well , also for drilling i would recommend solid carb drills ,hss is to slow and get dull ,if its a long run then time saved justifies the cost , we have great success with the kennametal drills , we been into serious runs of 316l and ive been more than impressed with how many holes we get out of a drill

If you are burning up drills several things are happening. You may be spinning too fast (slow down the rpm), taking too light of cut (speed up your feed) or a combination of both. It sounds like you are work hardening the SS and that will make it tough to tap.

i would suggest getting the kennametal catalogue to start with ,there is a ton of good info in it
we use the dynapoint drills a lot

follow their guide and you'll be rockin ,sometimes the speeds and feeds are jaw dropping but run it at that and you'll have good results , use g81 DONOT use center or spot drills with these , they are best with thru spindle ,if you don t have thru spindle then you may have to peck (worst case senario) depending upon how deep the hole is
the drills aren t cheap but if you run them till they're worn they are cheap to have resharpened
http://70.182.182.95/ProductCart/pc/configurePrd.asp?idProduct=24119
http://70.182.182.95/productcart/pc/pdf/se.pdf

thanks a lot

that really helps

mark