On 05/28/2018 06:21 AM, Dean Hoffman wrote:
I bought one at a farm supply store years ago for some really odd
project.* It walked down the pipe instead of making a straight cut.

I had one of those poorly-manufactured tubing cutters too.

If you started the cut going clockwise, the cutter would track true.

If you started the cut going anticlockwise, the cutter would start cutting a fine thread.

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Note: For you millennials who can't read an analogue clock, try youtube for an example of clockwise motion.