In article .net,
Peter Grey wrote:

"Ernie Leimkuhler" wrote in message
...


The JD Squared and Protools benders are both very popular for car work.

http://www.pro-tools.com/

http://www.jd2.com/


Ernie,

Can one do increasing radius bends on these or am I looking at building or
buying a bender like the one you built that's shown on your site?

Peter



2 very different concepts and applications.

Draw benders are for making small radius bends in thin wall tube
without collapsing the tube walls.

Ring rollers (aka- angle rolls) are for making large radius bends in
tubing and bar stock.

To make a spiral tube usually requires a special CNC controlled power
bender.