This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.
From: email@example.com (C. D. Tavares)
[On cutting Estes-style body tubes]
The simplest and best I ever used was Howard Kuhn's jig from the old CMR.
It's a simple piece of wood L-angle molding, with a notch for a razor
blade cut into one side (from the wing toward the elbow) at one end.
The only other parts are a wood block and a large black spring clip (the
kind you hold really thick reports together with). If you want, say, a
6" piece of tubing, you set the block 6" away from the razor notch and
clamp it there with the spring clip. Now lay the tube down the L-angle,
butting it up against the wood block. Insert the razor blade, press
lightly, and turn the tube. (Put a dead engine into it if the tube is
the right size to fit one.) Three to six turns, and you have an edge
that looks factory-cut.
---- ( ) <- spring clip | <- razor (edge on, / \ | sharp edge down) ____________---------___________________________|_______ | /_| |__/| | | | | |_______| || angle molding | | | | wood block || | |----------|____________|/-------------------------------j / lay tube here and spin it / /________________________________________________________/