Expanding mandrell - Woodworking Talk - Woodworkers Forum
 
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post #1 of 4 Old 03-26-2008, 12:52 PM Thread Starter
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Expanding mandrell

I would like to make some small wood cigar punches which are about 1/2" in diameter and have a 3/8" hole in the center to accept a brass or SS cylindrical cutter blade. I would like to be able to drill the hole first and then mount the piece on a small expanding mandrell that will expand inside the 3/8" hole. My lathe has a 2MT headstock. Can anyone recommend a product that will handle this?

Ken

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post #2 of 4 Old 03-26-2008, 02:36 PM
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Off hand Ken i cannot think of a comercial madrell that is available, not to sure what you are doing, but you could use a jacobs chuck and maybe some form of rag bolt/raw bolt not sure if you have a diff name there. this might be of use as well.
Its an o ring pin chuck made from a bolt this might do you.

http://content.penturners.org/articl...8/pinchuck.pdf

Other than that, turn a bowl, table lamp Hee Hee hope you find something ken..LB
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post #3 of 4 Old 03-26-2008, 02:59 PM
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A pin chuck might work. You can get them at http://www.woodturnerscatalog.com/ but I could not find the pin chuck online. they used to have them with the bottle stopper supplies.
A pin chuck is a round rod with a flat ground on it. A small round rod fits on this flat. You insert it in a hole and rotate it. The small rod tries to rotate toward the outside of the flat. This acts like a ramp and and the small rod locks the piece of wood on the pin chuck. Craft supplies used to sell a 3/8" pin chuck for making bottle stoppers. Perhaps you can call them and find out if it still exists.
I build mine. A little care with a hacksaw and file is all it takes. I siimply took a nail and cut it off. Then I cut and filed a flat that was just a few thousandths less deep than the nail was thick. I cut this in a 3/8" piece of drill rod. I use it all the time for bottle stoppers but it should work for what you are doing.
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post #4 of 4 Old 03-27-2008, 04:02 PM
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There is a type of expanding bolt which I beleve is used for anchoring things in concrete. I do not know the exact name of it. It is similar in idea to the expandable plug that you use to secure something to drywall. Perhaps you could locate one of these and modify it a little.

Another possible way to accomplish what you want to do would be with a piece of pre-threaded ready rod, some nuts, washers, and some rubber hose.

Gerry

Last edited by Gerry KIERNAN; 03-27-2008 at 04:04 PM.
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