On 12/1/22 08:52, Les Newell wrote:
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
That is what this is, laid up. Pretty stuff. If I can control the chop
saw slow enough. Straight down chop probably better. I sure wish you
could buy a carbide blade that was actually sharp. CBN I have but its
too small for anything but a teeny router to spin. Its also gawdawful
$$$, That is why my original idea was the chuck it up in a 4 jaw, put
the CBN wheel in that die grinder and let the lathe cut it off. I can
feed X as slow as .0002" per dial click. And that disk is only .030"
thick. I have a teeny router, and when the Saphire-5 printer gets here,
I can make a mount to hold it in a QCTH holder. Slow but perfect. Or I
could use the die grinder as I already have a mount for it, used it to
fix the bent spindles mt5 bore years ago. I can also cobble up a vacuum
fitting to collect the dust, which hopefully the best HEPA grade of
shop-vac filter will stop.
The chop saws dust bag isn't that effective a collector so I'll skip
that test.
Take care & stay well, Les.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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