(3123 Posts) Location: Central Ohio
I’m leaning toward the dowel plug idea myself, but with a twist.
First cut the tube(s) to rough length with a saw. Chuck up an oversized dowel (or block) in lathe mode, and turn a slightly-tapered tenon to fit inside the tube. Mount the tube “between centers” and dress the rough cut with a parting tool, right on top of the tenon. The tenon is semi-sacrificial, but it should be good for several cuts.
If you turn a groove in the tenon at the part-off line, you could even sand/polish the cut end of the tube.
(637 Posts) Location: Destrehan, LA
I would try the dowel inside then mounted in chuck and while turning I would use a utility knife to do the cutting. If I would use the bandsaw I would use dowel inside with tape around the plastic to then make the cut, if necessary then sanding disc to smooth edge.
(1475 Posts) Location: Portland, Oregon
I have been thinking about this since I read the post yesterday. My suggestion would be to use an X-Acto saw blade. They have very fine teeth for doing delicate work.
Mark V completely upgraded to Mark 7 Mark V 520 All SPT's & 2 Power Stations Model 10ER S/N R64000 first one I restored on bench w/ metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more. Model 10E S/N 1077 oldest one I have restored. On bench w/ metal ends & retractable casters.