Need Help!- Milling D2 Tool Steel

[trikerider2oo7]

I am a fairly new CNC machinist running a Haas VF-3 mill. I have to machine D2 tool steel and am having a hard time finding a good speed and feed rate. Im using 3/4" Accupro TiCN coated, solid carbide, fine tooth roughing end mills. They are about $200 a piece and I have already destroyed several of them. I have tried to take take .125 and .250 deep cuts, the full width of the end mill at 1200 rpm 10in/min, 1000rpm 10in/min, and 750rpm 6in/min. So far I have had the best luck with the 750 and 6, .125 deep but it still isnt right. Anyone have any speeds and feeds that would work good? Thank you

[peaceandcalm]

i think your problem is not the spindle speed, its the feed and depth..
try this option since i am doing tool steel as well on my current job..and it works good, i dont have the same cutter as you, but i think should be close enuf..
try:
2mil depth of cut (inch 0.078 i think)
spindle speed 1273 rpm
feed 4 to max 5 inches per min...

and dont use coolant what so ever..not even a drop or mist..
you can blast dry air would be heaps better...

hope this helps

[kling8]

I think peace and calm is close, your depth of cut was way to deep, I've run a face mill, with carbide inserts machining tool steel, It worked it was hard on the inserts, but did the job. So more passes less depth.. Good luck

[verticle 360]

yes,depth of cut is the name of the game.i work with soft tool steele and hard cut it.carbide and air is the way to go,hard or soft..030 d.o.c. feed 50-60 in.per min. on soft.on a 50 taper viper.