economical drill for stainless

[HEAVY METAL]

I have some 1.75 thick stainless steel plates with a lot of different holes sizes from about 5/8 down to .130 dia. MY mill has 3000 max rpm and no thru coolant. Just wanted to get some ideas on some good drills that wont break the bank for ss.

thanks heavy

[[email protected]]

Since you dont have thru coolant, I would just go with a standard 135 degree cobalt

[crazy^millman]

Good old cobalt at about 32 sfm will drill that all day long and only cost you the extra running time expensive drills make up. So does the extra cost of the drills make up for running the job faster. Do not forget my 2 for 1 rule in manufacturing though. My rule is that for ever minute you save you really gain 2 minutes. So as long as the expensive drills cost more than what you would make it saved time then go with the old stand by.

 

325 sfm .003 to .005 per rev with a premium carbide drills would not be out of the question in my mind on the bigger sizes. 325 sfm .0015 to .0025 on the smallest drill sizes. 10 times faster on the SFM is what I am thinking so now you have to ask yourself what is your time worth???

 

HTH

[X-L Engineering Corp]

Sumicarbide

They have both coolant thru and non-coolant thru and I've had very good success with both

[HEAVY METAL]

i have heard some good things about the guhring parabolic cobalt firex coated drills anyone used these

[[email protected]]

I've only used the firex drills with thru coolant

[Josh Kinney -Elite Engineering]

Guhring all the way.

 

I was drilling 0.375" deep in Tungsten with a 0.252" Guhring 1702 drill, no thru coolant and getting 800 holes per drill holding +0.001"/-0.000"....

[chris m]

I have used Guhring Firex [they have some "super" Firex now] HSCO parabolic drills in stainless with external coolant [F5522 or something like that] with pretty good success but SFM is low. The Guhring hi-performance solid carbide drills [like a 1702] kick some serious a$$. I think 300 SFM is definitely real, but Ron's feedrate numbers are low; I would think you're looking at .008 or .010 IPR with the right drill. We have actually done this in 17-4PH in production, so these aren't some BS catalog numbers I am quoting here.

 

It will cost you some $$ up front, but the dividends in time are significant

[Robert Ouellette]

osg 1100 and 1700 drill are great. .008 - .017 per rev and not that expensive either. my loves them for doing the tube sheets we do all the time. we went from 8hrs cycle times to 45mins with them.

[BrianP.]

+1 On the OSG 1100 and 1700 series drills. Have used them in a couple of places on different stainless steels. Recomended by the manufacturer no spotting. Saves an operation which of course equals time.