What do you call small diameter tube ? When I operated a spark erosion machine we often used tube of 1mm or less to put small holes in. This was gripped in a collet chuck ready to fit on the spark machine, we would then put the collet chuck in the lathe three jaw and spin at 800 or more revs. When spinning lightly grip the tube with finger and thumb close to where being held and run your hand away from the chuck towards the tailstock. Sounds dangerous and scary but works and tube comes out straight after a couple of goes.

Pyro MICC cable uses a roller box to straighten it after decoiling, thin sheet steel is straightened with a set of rollers after decoiling but the machine must be set up to run continuously or you will get roller marks that will be visible in the finished panels.

Mike

Another vote for Mike's suggestion….

I've installed a lot of Pyro in my time, there is a proper tool for straightening Pyro…

I've even visited the Pyro works when it was at Hebburn while serving my apprenticeship…(seems so long ago now..)

Good visit the BICC wonder how many apprentices did it, back to straitening depending on the length I roll mine

between two flat pieces of wood.

H

My method for straightening small tube was brought about by necessity. You just can not use a DTI on tube sub 1mm diameter. Once on the spark machine the final check to see if it was straight was done using the machines audio facility, IE electrical contact and zero the read out then bring the quill down and check again.