Planing spirals

[TomG]

That picture leaves a lot to the imagination. It probably is set up the same as the rifling machine, but you just can't see it in the pic. I can't think of a reason why not to do it the same.

BTW, I believe the rifling machine can do a barrel nearly as long as the sine bar (as long as the long leg of the triangle it creates). The indexing head and barrel supports are all adjustable to suit whatever length barrel is being rifled.

Tom