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Tool Talk Discussion Forum

drill speed for 1/2 in or larger hole in steel

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eric

07-23-2003 16:54:05




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tractor supply has a 150$ clark floor press. i gather this is not top of the line, but does clark make ok stuff. it slows down to 250rpm. is that slow enough? i seem to remember that 160rpm is what someone once stated here as ideal for large hole in hard stuff. thanks for your time eric




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Roger

07-24-2003 15:15:04




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 Re: drill speed for 1/2 in or larger hole in steel in reply to eric, 07-23-2003 16:54:05  
Cutting speed for mild steel is 100 Feet per minute with HSS.

Formula for mild steel is CS X 4 / D, for cutting with HSS.

CS is the cutting speed of the material, and D is the diameter of the hole or drill size.

So, for a 1/2" drill on mild steel"

100 X 4 / 1/2

= 400 / 1/2
= 800 RPM

Different materials have different cutting speeds naturally, and carbide drills can usually go double the speed of HSS drills. Of course, a lot of it also depends on the rigidity of the setup.

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Mark

07-24-2003 02:52:48




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 Re: drill speed for 1/2 in or larger hole in steel in reply to eric, 07-23-2003 16:54:05  
Just my two cents, I would look for a good quality used drill press before I buy another cheap drill press. For the first year when I had mine I had to repair it after every use. Stupid stuff. I the plastic crank handle snapped off, the spindle handle bolt sheared, and I had to replace the chuck with a good jacobs( cost 1/2 of a new machine) It was just made very poorly. I think I am finally learning to purchase (1) good used item vs. (4) new crappy items.
Alot of item you purchase nowaday have just too much plastic for my taste. I don't think I have been to a Mal-Wart in over two years. This sites exists for that reason. I don't anticipate the China Diesels tractor restoration page in 40 years.

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Joe (Wa)

07-23-2003 22:29:14




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 Re: drill speed for 1/2 in or larger hole in steel in reply to eric, 07-23-2003 16:54:05  
Not much steel here but a nice drill speed chart. Joe



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wdTom

07-23-2003 18:06:52




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 Re: drill speed for 1/2 in or larger hole in steel in reply to eric, 07-23-2003 16:54:05  
Well it might be slow enough. For large drills slower is better. I have slowed down imported drill presses more by getting a larger solid pully and boreing it out to fit over the largest pully on the idler pully, then making a "splice" or plate to attach the two pullies together using a few small (maybe #6 or #8) socket head screws in each pully. For the money you are talking about it is probably a Chineese import, they are a good value for the money. Not up to the quality of older US drill presses though, but they do come with the idler which allows low speeds.

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Frank M.

07-23-2003 18:04:40




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 Re: drill speed for 1/2 in or larger hole in steel in reply to eric, 07-23-2003 16:54:05  
I've had a Clarke drill press for about 7 years. I've used it a lot for wood working. Just within the last 3 years I've got the old iron bug and I've used it a few times on steel. Just recently used it to drill a couple of 5/8" holes in some angle iron. I put it on the slowest setting( I'm not sure of the RPM) and used lots of cutting oil. Worked just fine.
Frank M.



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RexB

07-23-2003 17:47:12




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 Re: drill speed for 1/2 in or larger hole in steel in reply to eric, 07-23-2003 16:54:05  
I've a Clark bandsaw, has worked fine. 250rpm is okay for steel. Happy Drilling!



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RexB

07-24-2003 09:21:34




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 Re: Re: drill speed for 1/2 in or larger hole in s in reply to RexB, 07-23-2003 17:47:12  
My drill press 2 lowest speeds are 180 & 280 rpm. I used the 180 rpm to drill 22 5/8" holes in a 1/2"x6"x32' mildsteel Ibeam used as a 3ton hoist in shop. Used the 280rpm speed to drill a kazillion holes in 5/16" steel beams in homemade flatbed trailer. For the price of that Clark press, and you're not going to use daily . . .



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