Large size adjustable transfer punch

[mklotz]

A project I wish I had never started led to the need to transfer the location of a 22 mm hole. My usual transfer punches only go to 1/2" and my expanding punches (top in picture below) don't go much farther. The commercial spring-loaded one-size-fits-many only goes to about 3/4".

Then I remembered the hole-centering-aid I described earlier here...

http://www.homemadetools.net/forum/h...6216#post35510

The largest of these goes to 1". Pop it in a collet, drill and ream for a close sliding fit for the one-size-fits-many punch and Robert's your mother's brother.

The new hole wiped out the center but that was quickly restored with a slightly larger center drill. Now the tool serves two purposes-a goal for which I always strive when making tools.

[Paul Jones]

Marv,

Thank you for introducing me to expanding transfer punches. I like your idea for the larger diameters. Thank you for the posting.

Regards, Paul

[Frank S]

I no longer have any pictures or the tool but your adjustable transfer punch looks alot like the drawing I have of one that I made
It worked on holes from .5" through 1.75" as long as the material was thick enough
a snap ring not shown held the adjustable punch in the squaring shell
just hold the outer shell to the work piece to make the punch perpendicular to the part and strike the center punch

[mklotz]

I no longer have any pictures or the tool but your adjustable transfer punch looks alot like the drawing I have of one that I made
It worked on holes from .5" through 1.75" as long as the material was thick enough
a snap ring not shown held the adjustable punch in the squaring shell
just hold the outer shell to the work piece to make the punch perpendicular to the part and strike the center punch

Functionally, they look to be identical although my commercial one is much smaller than yours.

[mklotz]

Marv,

Thank you for introducing me to expanding transfer punches. I like your idea for the larger diameters. Thank you for the posting.

Regards, Paul

Yes, they're very handy and, of course, solve the problem of transferring metric sized holes; I've never found a set of metric transfer punches.

They're still sold but, to my amazement, are far more expensive than I remember paying...

Enco - Guaranteed Lowest Prices on Machinery, Tools and Shop Supplies

I remember paying about $30 many years ago.

[Paul Jones]

Marv,
After reading your article, I too looked for the adjustable transfer punches on eBay and at Enco. These are more expensive than I expected but do cover a wide range of small hole sizes of any size. I may look into making my own. Thank you for the ideas.
Paul

[DIYer]

Thanks mklotz! We've added your Large Adjustable Transfer Punch to our Metalworking category,
as well as to your builder page: mklotz's Homemade Tools. Your receipt:

Large Adjustable Transfer Punch by mklotz

tags: punch, hole transfer