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THREE FACET PRICKPUNCH

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ieezitin:
Hello lads..

I found this trick on Tony's website and it works perfect...

its really annoying to watch a drill bit wobble on the prick mark / center punch mark just as your about to plunge it in the work, sometimes it wonders off and bores off mark and ruins your work, to solve this problem grind three facets on the punch on a 30 deg angle... i used this old punch and recycled it for this purpose......


























Loads a money........


Anthony

JHovel:
Interesting.
Does it work any better than a round conical one?
If so, why?
Cheers,
Joe

ieezitin:
I have no idea why this works, my results have been very satisfactory compared to the conical punch, try it yourself and let us know what you find.

Anthony.

chipenter:
Same as a watchmakers countersink never chatters , great for deburing holes .

Lew_Merrick_PE:
I was taught (back in the Dark Ages) to first use a Prick Punch (with a 60° included angle at the tip) and then use a Drill Center Punch (with a 130° included angle at the tip).  [Mind you we used 135° included angle drill bits exclusively.]

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