304 stainless

[fourperf]

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

thanks

mark

[DSL PWR]

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.

[dertsap]

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

[fourperf]

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.

Originally Posted by dertsap 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

[DSL PWR]

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.

[dertsap]

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/...dProduct=24119
http://70.182.182.95/productcart/pc/pdf/se.pdf

[fourperf]

thanks a lot

that really helps

mark