Black Friday Deal got me :)

yep, already had that thought with the 4-jaw chuck route. the pneumatic idea will require different jaws for different material size but those could be made as well. that's the easy part. figuring out how to put it all together and not break the bank in the process is the hard part any kind of hollow body design for something fancy gets expensive quick the bigger you get.

That manual self-centering 4 jaw chuck came yesterday, and that brand seems pretty well made and works really well.

i have some material ordered and coming for a attempt at a rotary union, the seals should be here today, i hope this material is not under sized or i will have issues. for whatever reason thick-walled tube in this size range is expensive and i only had one supplier that i have used that was fair on price, but sizes were limited. i checked on bar stock prices and that was even more expensive yet it's amazing how you get screwed so bad on prices for small orders.

these unions are hard to make on the cheap. i did see one import that had 120 mm bore but was around $400 each. what i am trying is 140 mm bore. not big enough for a 4" square tube so it is what it is i guess. if i can make these i can make 2 of them for around half the price of one of the smaller imports.

i hope i can make it work would be a neat build and if nothing else i am eager to try it at least. nothing ventured nothing gained