pgmrmike
Hot Rolled
- Joined
- Jun 24, 2010
- Location
- Plantersville, TX
Have a job drill drilling 304 stainless, I thought I did my research and bought Guhring 5525 carbide drills with coolant thru. I programmed their recommended speed and feed. Straight thru, no peck. By the time I got 2" deep chips started packing and drill making noise. Been fighting it and only thing that works is pecking .250 deep then feed fast off to -.2" then feed back down fast and slow feed to recommended .1" from re-engagement. After about 2-1/2" deep each peck goes down to .2" then eventually .15".
I am feeding out instead of rapid to keep the coolant under the chips so I dont recut on the way down.
No chips exit until almost to top of the hole.
The chips dont look bad, I upped the feed a bit to make them smaller/tighter but it had no effect. They just wont come out.
I know the problem is my coolant pressure is too low, but figured I would get more depth before it was an issue. I think I have 150psi thru though it blows coolant very well. ( if I am reading it right, 150 is the low end of their recommendation )
I just broke one in the hole, customer material.
4 axis Leadwell V30 VMC Linear ways-not most rigid machine in the world, but more rigid than the Haas' I have run
Guhring 5525 1/4" ( 6.35mm )
304 Stainless
Coolant concentration 12 ( upped it to make chips come out )
Any other tips or recommendations?
I am feeding out instead of rapid to keep the coolant under the chips so I dont recut on the way down.
No chips exit until almost to top of the hole.
The chips dont look bad, I upped the feed a bit to make them smaller/tighter but it had no effect. They just wont come out.
I know the problem is my coolant pressure is too low, but figured I would get more depth before it was an issue. I think I have 150psi thru though it blows coolant very well. ( if I am reading it right, 150 is the low end of their recommendation )
I just broke one in the hole, customer material.
4 axis Leadwell V30 VMC Linear ways-not most rigid machine in the world, but more rigid than the Haas' I have run
Guhring 5525 1/4" ( 6.35mm )
304 Stainless
Coolant concentration 12 ( upped it to make chips come out )
Any other tips or recommendations?