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Drilling speeds

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Terry

01-12-2001 09:50:37




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I just bought a 3/4" drill bit for my drill press and will be drilling some 1/2" holes out to 3/4. The material is just mild steel and I was needing to know what speed to drill at so as not to smoke my new, rather pricey, bit. Is there a chart that will tell speeds for different sizes and materials? I am not the easiest person in the world on drill bits. Thanks for any help.

Terry




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Rod MI

01-13-2001 16:08:50




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 Re: drilling speeds in reply to Terry, 01-12-2001 09:50:37  
Make shire you have the part clamped firmly when opening those holes up or when drill brakes threw it will BITE YOU!!!
My rule for pilot drilling is use a drill 1 or 2 sizes bigger then the web of the drill depends a lot on drill size.



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Bill D

01-12-2001 13:14:19




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 Re: drilling speeds in reply to Terry, 01-12-2001 09:50:37  
Most of the newer drill presses have a chart on speeds The formula posted will also work Make sure you have a good tight set up as it is easy for the drill to grab when drilling out a hole.I would run a little slower than the recommended speed



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Gordon

01-13-2001 12:07:33




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 Re: Re: drilling speeds in reply to Bill D, 01-12-2001 13:14:19  
Slower the better if you want the drill bit to last a LONG time. Turn the Bit slow, feed easy, but keep it cutting, and use a cutting oil or cutting coolant. You can use the (old style) high carbon steel drill Bits if you turn them slow enough and never over heat them. For production work speed is important. Speed vs cost of drill bits and labor cost are all important. For my use speed is not important at all. The time to go to town it get a new drill bit and the cost of the new drill bit are major concerns. Have fun, Gordon

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BFO

01-12-2001 09:57:54




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 Re: drilling speeds in reply to Terry, 01-12-2001 09:50:37  
Just remember this simple formula;
Drill speed = (4 X the cutting speed)/ drill diameter,

where the cutting speed for mild steel is 70-100, when using a HSS drill bit.

The minumum would be 373 rpm, and the max speed would be 533 rpm.



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Shopguy

01-12-2001 16:45:24




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 Re: Re: drilling speeds in reply to BFO, 01-12-2001 09:57:54  
BFO has basicly the correct formula,but good shop practics is to slow down,especially in your case where the pilot dia of 1/2 likely exceeds the web width of the 3/4 drill,causing chatter.A little cool tool helps extend bit life and you are better to touch up the bit more often,quenching frequently,rather than pushing to far and then having to grind back a 1/4" to renew your edge.
Good luck
Shopguy
P.s no such thing as to slow,the formula is for a ideal world,balancing production rate and tool life.

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Terry

01-12-2001 20:27:39




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 Re: Re: Re: drilling speeds in reply to Shopguy, 01-12-2001 16:45:24  
Thanks for all the responses. What is a simple rule for the size of a pilot hole when drilling a larger hole? Some of the 3/4 holes I have to drill don't have a hole of any size there now. I am printing all this out and hanging it by my drill press for future reference.

Terry



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Shopguy

01-13-2001 03:20:30




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 Re: Re: Re: Re: drilling speeds in reply to Terry, 01-12-2001 20:27:39  
Hi Terry
Can't remember if there is a rule,been useing instinct.I'd center drill,3/16,3/8,5/8 then 3/4.Speed up for the first couple drills.Keep in mind I am talking strong machine & set up.Judge your situation acorddingly.
BE safe
Al



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Ray,IN

01-13-2001 20:40:18




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 Re: Re: Re: Re: Re: drilling speeds in reply to Shopguy, 01-13-2001 03:20:30  
My personal rule for pilot drills is, select a size no larger than the web of the final bit. I never step up sizes, I drill pilot then final size, this has always worked for me, whether tool steel,mild steel or aluminum. Sounds like all these guys have been around, good advice! Slow is good.



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testing 123

01-29-2001 18:08:04




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 Re: Re: Re: Re: Re: Re: drilling speeds in reply to Ray,IN, 01-13-2001 20:40:18  
s



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BFO

01-12-2001 17:27:51




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 Re: Re: Re: drilling speeds in reply to Shopguy, 01-12-2001 16:45:24  
Al, you and Bill are absolutely right, slower is better. In the absence of charts, the formula is easy to remember and a good place to start.



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testing 123

01-29-2001 17:07:27




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 Re: Re: Re: Re: drilling speeds in reply to BFO, 01-12-2001 17:27:51  
.



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