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1st July 2009, 01:29 AM #1
Need to make large holes in steel
I need to make 25 mm holes in 2 bits of 5 mm plate. The biggest drill bit I have is a 16 mm bit. Anyone know of a way to make these holes and they don't have to be perfectly circular with your basic run of the mill items found in a typical workshop? I am considering using a file to make the hole larger but that will be slow. Other option is to buy a bigger drill bit but it would only be used for a one-off job.
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1st July 2009, 02:27 AM #2
Buy a bigger drill = dollars from your pocket
File it bigger = time from your life
What can you best affordAshore
The trouble with life is there's no background music.
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1st July 2009, 02:52 AM #3GOLD MEMBER
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Have you thought of using a Hole Saw. Even though they will cost a few dollars you would probably find a use for them doing other jobs.
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1st July 2009, 07:04 AM #4Mug punter
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1st July 2009, 09:22 AM #5Pink 10EE owner
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superdrill??? I have seen one in action and they do work well..
http://www.practool.com/super-drill.html
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1st July 2009, 10:54 AM #6
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1st July 2009, 10:59 AM #7
I faced the same problem while running electrical wires around the workshop just recently..
The quickest option I found was a "step" drill. I ended up buying one and doing all of the holes I needed.
They can be expensive, depending on the step size you want, or conversly contact a garage installer and see if they will lend/hire you one of theirs for a few hours.
look here : http://www.irwin.com/irwin/consumer/...rwinProd100146I try and do new things twice.. the first time to see if I can do it.. the second time to see if I like it
Kev
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1st July 2009, 12:30 PM #8Member
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you could use an arc welder to blow the holes in the plate. I know I can do it easy enough and unfortunately all to frequently, so doing it on purpose would be a nice change
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1st July 2009, 12:34 PM #9Mug punter
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1st July 2009, 01:02 PM #10
Thanks guys for your ideas. I haven't had to use the drill press for anything over 13 mm and I agree with Bob, what a PITA and that was for the 16 mm bit that I had. The machine struggled no matter what lubricant I used or what speed I used. Thought that the bit was blunt but even after sharpenings it still was slow and I got the triangle hole. I will investigate the hole saws.
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1st July 2009, 01:22 PM #11
Hate to say this but if you got a triangular hole then the drill wasn't sharpened properly
Ashore
The trouble with life is there's no background music.
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1st July 2009, 03:48 PM #12Intermediate Member
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Yeah just buy one of those el cheapo hole saw kits you see at places like Bunnings & other cheap shops.
Last time i bought a kit it was $14.00 or something,cut 3 holes through engine bay sheet metal for a turbo kit & still looks like it would cut plenty more.Only thing i had to do was drill a good pilot hole.
If it goes blunt after a few cuts who cares its cheap lol.
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1st July 2009, 06:06 PM #13
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1st July 2009, 07:00 PM #14SENIOR MEMBER
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Walk in to an engineering shop with your two plates and a slab. Job done.
Tools
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1st July 2009, 07:17 PM #15
If you're up for a short drive, I have bits in that size here if you want to bring them here and drill them
Cheers
DJ
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