I've had best results with abrasives. A Dremel, angle grinder cut-off
wheel or CBN wheel should work. I generally use a cut-off wheel and
square it up with abrasive paper if needed. No need for internal support
if you are gentle. Be very careful of the dust - it does similar things
to your lungs to asbestos.
Is this tube pultruded or laid up? If it's a uniform black it's
probably pultruded. If you can see the weave it's laid up. Pultruded
tube is very directional. The majority of the fibres are aligned along
it's length so it's strong in bending, tension and compression along
it's length. Sideways crush loads however will break it easily. If you
bolt it down you must use a solid plug to support the walls. Laid up
tube is much more expensive but it is stronger and generally more
resistant to side crush loads.
Les
On 01/12/2022 04:05, gene heskett wrote:
Greetings all;
An unusual question. How to cut, neatly, and squarely, a 20mm square
carbon fiber tube to length, say 550mm out of an 800mm tube. I'm
making a linear rail bearing X axis for two of my 3d printers,
I have a die grinder that I can mount in a quick change holder, and a
2" by 30 thou CBN disk and 1/4" arbor, and a 4 jaw chuck on my Sheldon.
Do I need to print an 18mm square plug to insert into this tubing to
support the 1mm thick tubing walls, or can a relatively light grip be
enough to hold it fixed while I turn slow and cut it off with the CBN
wheel running at about half line voltage in the die grinder?
All I can see in my minds eye is a hugely ragged edge cutting it by
hand with a hacksaw.
Better ideas anybody?
Thanks All.
Cheers, Gene Heskett.
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