Hello Don,
It is best to hang them of course..... my husband made me a hanger that was portable and would latch on to any table edge by way of a C clamp that was bolted to the bottom of the hanger. It involved a thick dowel with a large hook at the top end. It was cut to the length that would hold the motor/shaft combo at the ideal height for me. Everyone is different so you would have to play with it a bit to figure that out, but it worked very well for me. I do sometimes go to carve with a friend who also power carves and has reasonable dust collection for both of us or to carve outside with an extention cord.
I never took my power carver to class though. My classes were not set up for power carving and it isn't fair to inflict all that fine dust on the others in class nor expect them to have to wear a mask just so I could power carve.
In the end, it was this very thing that led me to leave the class even though I enjoyed it very much. Others started bringing their power carvers and using them in an enclosed area that had no dust collection set up for power carving. I couldn't stand the dust and did speak up politely a time or two about it. I was met with "oh, it's not hurting anything" or "I'm way over in this corner so the dust is over here". Of course, the dust was all over the room and everyone was breathing it.
I said no more as it didn't seem to be an issue with everyone else (although another couple did have to quit due to both of them having breathing problems) so I just quit attending. I still go back just to say hi once in a while, but the person in charge of the group should have insisted that no power carving be done in that situation and nipped it in the bud when it was just starting to be a problem.....
I include my tale of caution here because many classes and carving groups are set up with gouge and knife carving in mind. There is no facility for dust collection. Wood dust is a HUGE health hazzard....
But back to the portable hanger....you could use what ever you happen to have, dowel, metal tubing, etc..... A few bolts, a hook of some kind and a C clamp and you are good to go.
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carving.