Cutting cardboard tubes

Cutting Cardboard tubes accurately can be achieved with this setup.
 

1. Two pieces of wood are joined in an "L" shape that is longer than
   the piece of tube needed (accuracy of the angle is not important).

2. A hobby saw is nailed/screwed to the end of the "L" frame with
   the cutting blade sticking out just fare enough to cut through the
   thickest of tubes you might need to cut.

3. Tube is marked the correct length then place the tube at the blade
   where the cut is needed.

4. Get a block of wood and clamp this at the other end to stop tube
   from moving off the cutting mark.

5. Now turn the tube against the saw while applying a little pressure
   to keep the tube held against the end block.

The result is a perfect square cut which is what you need for coupling
points on those long rockets. Saw can be found at hobby stores.

Cutting Bulk Heads & Retaining Rings.

Balsa rings can be made using an adjustable hole
cutter purchased at hobby stores. Cut the outside ring first.

Medium size wooden rings up to 4" can be made
using an adjustable hole cutter shown on left.

This type of cutter is adjustable so that the rings
match the tube size.

Then nail the rings together to a scrap piece of
wood and cut the centre hole.