nova_robotics (Jul 25, 2020)
many HVAC guys have a powered machine to do this with drop in cassettes for each size of tubing. Plus having one for each size has another advantage there is no need to adjust the roller centerline for different sized tubing.
True enough an auto mechanic might only have a couple of sized straighteners for steel lines such as brake and fuel lines 1 for 3/16, 1/4,&5/16" and one for 3/8, 7/16, & 1/2" He might even use the same devices for running copper air lines in the cases of restoring antique trucks but he would also need 1 more to fit the 5/8 &3/4" air lines in that case. It wont matter if the copper is not absolutely perfectly cylindrical as his fittings will be flared connections anyway.
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