Gallery, Projects and General > How to's

Drilling large holes in thin metal using a twist bit!

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BillTodd:
Odd, a few months ago a tool maker at work showed me this rag trick , I'd not seen it before , now it appears everywhere. New or like flu - just popping in to infect a new generation :-)

Mark_Fisher:
Thanks! Why does it work?

Sent from my GT-P3113 using Tapatalk

mattinker:
BillTodd I'm glad to contaminate, I feel that this kind of thing shouldn't be lost! Mark, how does it work? Well, I think that by filling up the space with rag, the tendency for the two flutes to move sideways is counteracted or at least reduced therefore cutting in an arc instead of a series of tangents.

Regards, Matthew

awemawson:
Probably first discovered by some hapless chap who caught his sleeve when drilling. When they were consoling him on the loss of his arm, they could at least compliment him on the roundness of the hole  :jaw:

Biggles:
Mat, I posted before I read your comment but there are other makes and sizes also. I would have thought the punch method safer than a rag round the quill of a drill. (The rag could catch the vice and spin the lot round). But it is interesting.  :headbang:

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