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Thread: Trying to drill Very hard metal
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27th October 2013, 12:55 AM #16
I lookk forward to both the pictures and the discussion in Bendigo
Cheers,
Joe
9"thicknesser/planer, 12" bench saw, 2Hp Dusty, 5/8" Drill press, 10" Makita drop saw, 2Hp Makita outer, the usual power tools and carpentry hand tools...
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27th October 2013, 09:27 AM #17Senior Member
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I think the OP is drilling the plug for lockwire which would be .032" maximum requiring a 1/16" hole so a masonary drill will not work. If this is a genuine aircraft part it would most likely be made from chrome moly which work hardens very easily if drilled at too high speed, try around 400 rpm for hss drills.
Lex.
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27th October 2013, 02:00 PM #18Senior Member
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27th October 2013, 07:36 PM #19SENIOR MEMBER
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27th October 2013, 08:41 PM #20.
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I have cut several dozen holes from 5 mm to 8 mm through the very hard stuff used in the nose bearings of chainsaw bars with masonry bits. The bit effectively scrapes its way through the metal using the method I described above. I say scraped, because the chips generated look much more like scrapings than twist drill swarf. The bit does the same through mild steel so is of course much slower than a twist drill. Notice I also said "new" bit in my first post which normally has enough of an edge to perform the scraping. Old bits can be used but the carbide needs to have enough of the edge restored to do the job.
A problem can arise at breakthrough where the edges of the hole can grab and snap the carbide. To reduce the possibility of this I usually drill to breakthrough and then drill from the other side. disintegrating the carbide. I have probably wrecked 3-4 bits either because of this problem or by pushing too hard. Most people that try this do not push hard enough but it is also possible to push too hard thereby totally disintegrating the carbide
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