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Gallery, Projects and General => How to's => Topic started by: ieezitin on July 04, 2016, 10:04:22 AM

Title: THREE FACET PRICKPUNCH
Post by: ieezitin on July 04, 2016, 10:04:22 AM
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......


(http://i721.photobucket.com/albums/ww212/ieezitin/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_161954_zpsjlk2s8iq.jpg) (http://s721.photobucket.com/user/ieezitin/media/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_161954_zpsjlk2s8iq.jpg.html)



(http://i721.photobucket.com/albums/ww212/ieezitin/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_161831%20%20%20%20%20%20hy_zpsuditgtdf.jpg) (http://s721.photobucket.com/user/ieezitin/media/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_161831%20%20%20%20%20%20hy_zpsuditgtdf.jpg.html)




(http://i721.photobucket.com/albums/ww212/ieezitin/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_161822_zps4o7h8uvw.jpg) (http://s721.photobucket.com/user/ieezitin/media/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_161822_zps4o7h8uvw.jpg.html)



(http://i721.photobucket.com/albums/ww212/ieezitin/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_161811%20%20%20%20hy_zpsqu7tsumc.jpg) (http://s721.photobucket.com/user/ieezitin/media/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_161811%20%20%20%20hy_zpsqu7tsumc.jpg.html)



(http://i721.photobucket.com/albums/ww212/ieezitin/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_170735_zpsqgo1qqwc.jpg) (http://s721.photobucket.com/user/ieezitin/media/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_170735_zpsqgo1qqwc.jpg.html)



(http://i721.photobucket.com/albums/ww212/ieezitin/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_164927_zps4pxypkf7.jpg) (http://s721.photobucket.com/user/ieezitin/media/Canedy%20Otto%20column%20drill%20press%201910%20circa/THREE%20FACET%20PRICKPUNCH/IMG_20160703_164927_zps4pxypkf7.jpg.html)


Loads a money........


Anthony
Title: Re: THREE FACET PRICKPUNCH
Post by: JHovel on July 04, 2016, 10:36:12 AM
Interesting.
Does it work any better than a round conical one?
If so, why?
Cheers,
Joe
Title: Re: THREE FACET PRICKPUNCH
Post by: ieezitin on July 04, 2016, 10:53:39 AM
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.
Title: Re: THREE FACET PRICKPUNCH
Post by: chipenter on July 04, 2016, 11:02:03 AM
Same as a watchmakers countersink never chatters , great for deburing holes .
Title: Re: THREE FACET PRICKPUNCH
Post by: Lew_Merrick_PE on July 04, 2016, 12:47:15 PM
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.]
Title: Re: THREE FACET PRICKPUNCH
Post by: DavidA on July 04, 2016, 12:53:29 PM
The following may be helpful here.

https://www.youtube.com/watch?v=Ot8wPGQW3JI

Dave.
Title: Re: THREE FACET PRICKPUNCH
Post by: velocette on July 04, 2016, 09:05:33 PM
Hi
One thing I was taught in the distant past was to file off flush with the surface was to use a thin warding file remove the burrs

Eric
Title: Re: THREE FACET PRICKPUNCH
Post by: Imagineering on July 05, 2016, 06:53:31 AM

If you do this to a piece of Carbide and make the angle steeper, it works as a perfectly good engraving Tool in a CNC Setup.
Title: Re: THREE FACET PRICKPUNCH
Post by: Pakrattuk on August 16, 2016, 12:45:30 PM
I remember hearing from a jeweller friend who was working with stainless steel at the time that a 3 sided centre punch like the one shown, was ideal for stainless steel as the sides produced by the punch gave the drill something to bite into as opposed to a round punch mark which could often lead to the drill spinning and work hardening the stainless, I've used this type of punch anytime i'm drilling stainless steel and rarely have any problems