Is it possible to buy a metal hoop?

[dvddvd]

I'm planing on building a spray booth rig for spraying guitars.

I was planning on using 20mm steel conduit.

I've found a pillow bearing flange/ base for the base plate.

Then I was going to bend some steel conduit into a large u shape with a 90 degree where it goes through the base plate.

I wanted a 400mm round wheel/hoop at the bottom so I can turn the piece while I spray the body..

Is there any pre made metal hoops that I could use that can be welded onto the conduit?

 

[dvddvd]

 

[dvddvd]

A bit like this but instead of the D shape handle on the bottom a circular hoop.
How easy would it be to bend a perfect circle in 20mm conduit with a manual pipe bender machine?

 

[ChaiLatte]

How easy would it be to bend a perfect circle in 20mm conduit with a manual pipe bender machine?

It would not be possible. The best you might get is two individual, separate bends just over 180 degrees, but full circle, no.

All conduit benders use a former, so whatever bend you get will be the radius of the provided former. You can probably look up (or go to a local multistorey carpark and measure) what that radius is for 20mm conduit but it will be smaller than 200mm.

Look at a picture of one and think about what you see and how you would proceed. You need a straight length projecting from the end of the conduit to hook under the part that resists the bending force. Once you have pulled the first 90 or 120 degrees of the bend, how do you slide the conduit forward to hook back under that part to pull the remainder of the bend?

https://www.angliapipetools.co.uk/p...bender-20-25-mm-hilmor-el25-parts-compatible/

For a full circle, a 3 roll bender is the tool, and you need to buy wheels for it that accommodate 20mm diameter material (the 3/4" ones below would probably be OK).

https://stakesys.co.uk/rb38-3-roll-bender

If you have more time than money, you could copy that one using some 3D printed wheels, some bearings and a scissor jack all mounted between two stout pieces of wood (e.g. kitchen worktop offcut). I have also seen pictures of someone mounting two rollers to the bed of a milling machine, using the spindle as the third roller and the Y-axis to put on the squeeze.

I would be tempted to cut a plywood circle a bit smaller than the ID of the finished ring, fill the tube with kiln dried sand (ends capped) and pull it around the circle, restraining it from lifting as you go. You will need to go maybe 125% around the circle as the two ends will not bend.

Edit:

https://www.smythstoys.com/uk/en-gb...ts-basketball-hoop-wall-mounted-45cm/p/233755

Hacksaw off the excess and file smooth. I think it could be 450mm.

 

[Chief Sawdust Maker]

Have you got a good exhaust fitting shop near you? Not one of the big chains but a local specialist
We have a local one and he has a cnc pipe bender and will make stuff to order in mild and stainless in a wide range of diameters

 

[ChaiLatte]

Have you got a good exhaust fitting shop near you?

I have not seen many 20mm diameter exhaust pipes. The boy racers around here tend to go for 5".

A CNC bender will not do a full circle because it has to grab the pipe in the same way as a manual bender. A full circle has to be rolled. For superb exhaust bendsmanship, please see lancethegass on Youtube.