I got a PVC pipe cutter a year or two ago, and used it once. Now I need to use it again and I am finding it extremely difficult to get it to cut the pipe. This cutter is of the style where there is a sharp disc on the outer edge and two black rollers on the inner edge with a screw-like mechanism to move the inner edge towards the outer one; one rotates the cutter around the pipe (or vice versa) while gradually tightening the screw.
The first problem that I had (when I first used the device) was that I seemed to have to turn the screw an insane amount to get the pipe completely cut, to the point where the pipe itself is showing visible deformation (bowing). If the cut in the middle of the pipe this doesn't seem to be a problem (I'm using 3/4" schedule 40 PVC), but if I need to cut a short length of pipe (under 2-4 inches) this can damage the pipe.
The second problem I only encountered now after not using the cutter for a year or so. The problem that I am having now is that, before I have tightened the cutter enough to cut all the way through the pipe, I am seeing some kind of black mark being made on the pipe itself. Since the rollers are black I can only suspect that the force between the pipe and the roller is causing part of the roller surface to come off. Obviously I don't want a black film compromising the integrity of the bond; I have tried sanding it but it doesn't completely come off. I wound up using a pocket knife to finish cutting the pipe but that is rather sloppy and the edges requires a lot of sanding.
Is this just a crappy tool (my searches for "PVC pipe cutter" yield hardly any images similar to the type I am using, but it's what the hardware store had) or did I just get unlucky? I haven't really used it that much so I wouldn't think the problem would be the disc blade getting dull. I assume I probably need to throw away this cutter and get a new one, or is there some trick like applying oil to the roller or something?