Conchuck

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Have seen that type of internal clamp before, but used with pipes and the such. Should work well on good solid woods.

As with a pin chuck, the hole needs to be dead on the shaft size.

Not much difference in function than the closed end expansion chucks -- but 22 mm is about a 1 inch hole.
 
This seems easy enough to replicate though... It really shouldn't be that tough to make a few of these in various smaller sizes. If I were going to fab a few, I would just make them as mandrels instead of chucks.

The only thing that worries me is that it looks like it will put too much pressure on a tubeless pen. I would think that anything with brass guts should be fine though.
 
That does look interesting.

But did anyone else find it odd with all the tools in the background he didn't use a drill press?
 
After watching, the video do not see a big need for a ConChuck. If they had demonstrated some off center turning using the ConChuck, might feel differently.

You would waste less wood using your stepcenter, 2 & 4 prong drive centers and live centers to accomplish what he did.

You would waste less wood using a 4-jaw chuck whether gripping a tenon or expanding into a dovetail recess.
 
termitepenman said:
I contacted Pop's Shed yesterday to inquire if I could get a ConChuck in the U.S. I was told that they did not have a distributor in the U.S, but they would ship for a complete price of $100 USD.
Click to expand...

Geez that's strange, I was offered it for $95 Australian dollars + $25 shipping to Canada.

I am machining my own version and may demonstrate here if all goes well. It's NOT as easy to build as suggested. Somewhat 'tricky' to get the threaded bolt to 'attach' to the bottom sector and continue to spin in order to have expansion to the upper sector. It's been a good challenge to figure out so far.

Thanks to the thread originator(Carmen) for this posting.:smile:
 
a big problem i see with it is that when you do get it round, the hole you used to put the chuck i will be off center at the least a bit. We made a similar devise one time but it had double bevels and held item on center.
 
I thought thats why the make the woodscrew for your chuck? Mine came with my Talon and I have screwed on some odd shaped blanks with no problems. No way am I paying $100 for a freakin expansion bolt that screws on to your spindle..........
 
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