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Old Dec 07, 2002, 01:57 AM
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robw's Avatar
Detroit, Michigan
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how do you cut carbon rods?

how do you cut carbon rods, without making them frey?
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Old Dec 07, 2002, 02:34 AM
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United States, CO, Longmont
Joined Jul 2001
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Hi. I use an Exacto blade. I roll the blade over the rod on a hard, smooth surface. I don't press too hard--just get it straight. A few rocks back and forth cuts a deep groove all the way around the rod. Then I can easily snap it. This old method also works on brass and aluminum tubing and wooden dowels.

Regards,
Q
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Old Dec 07, 2002, 02:47 AM
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The 'score and snap' method works well provided you have a blade with no nicks in it (meaning a fresh blade). You do get some localized delamination of the inner fibers when you use this method but you can go back and apply some thin CA to re-bond those loose fibers.

If you need an absolutely 'clean' cut with no 'brooming' then I recommend you get a diamond cut-off wheel (Orchard Supply has them) for your Dremel tool. Apply two turns of masking tape at the area to be cut, mark and cut (slowly) with the cut-off wheel.

Of course this will generate CF dust, you could 'wet' cut it to lower the dust generation but you will end up with the cleanest cut with little or no fiber-matrix separation.

Regards,
Roger
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Old Dec 07, 2002, 03:36 AM
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vancouver, bc
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a dremel... but do it outside. I hear that CF dust is really bad for you.

or use one of those cutoff pliers that electricians use. They have holes that line up when the plier is open, and then slice through whatever is in the holes when you close them.

if you do fray a CF rod, just dab a tiny bit of CA on the end, that will prevent fraying also. I put some CA on scrap paper, then touch the CF rod to the glue.
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Old Dec 07, 2002, 04:14 AM
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I just use a hand saw with a fine blade, a junior hacksaw usually. CF won't fray.

Mike
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Old Dec 07, 2002, 07:15 AM
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stick in a drill -
rotate and cut with a dremel cuttof wheel while blowing the dust away from you

this is the best way possible-

no fraying
no masking tape
just a clean non-flayed cut

you can cut on top of a wet sponge or cloth to get rid of all toxic dust(while using a dremel)
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Old Dec 08, 2002, 03:34 AM
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San Mateo, California, United States
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Quote:
Originally posted by Kevin Graehl
stick in a drill -
rotate and cut with a dremel cuttof wheel while blowing the dust away from you

this is the best way possible-

no fraying
no masking tape
just a clean non-flayed cut

you can cut on top of a wet sponge or cloth to get rid of all toxic dust(while using a dremel)
That would be fine for cutting short sections of CF rod Kevin, but you will find it rather dangerous with long lengths of > 6".

I simply use my bare hands, take a deep breath and blow while spinning the rod with my fingers while slicing through with the cut-off wheel. The masking tape is so that you can keep track of where the blade is so it doesn't 'wander' about, has nothing to do with keeping the CF from delaminating while cutting.

Regards,
Roger
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Old Dec 11, 2002, 12:54 AM
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mabye you didn't understand right..

any length is possible

put CF in drill
set on top of knees
rest palm on to of CF
angle dremel to cut
blow dust away

this method is the only way i have found it usefull to cut larger CF tubes (hollow) with square ends

for the smaller rods and exacto knife will work fine as will the drill dremel method
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Old Dec 11, 2002, 03:19 AM
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Kevin,

I am not looking for any argument here, and I did understand what you were communicating.

I'm simply bringing up the point that with the CF tube supported in this fashion, cutting long lengths of material will be very difficult to hold steady.

Ever watch a machinest 'parting off' a finished component on a lathe? The cut-off tool is always located close to the lathe chuck, never at a distance. This minimizes errors caused by flexing of the material being cut. And CF tubing does flex, it's this flexing which can cause the cutting tool to gouge and catch ahold of the material being cut resulting in injury.

But each of us has our own technique, one that works for us and this forum provides a means of disseminating that information.

Believe me, I've seen my share of 'industrial' accidents to warrant my position here.

I'd recommend that instead of holding the drill in your hand that you lock it up in a bench vise. That way you can guide the end of the CF rod adjacent to the cutting area. No chance of it whipping about.

Regards,
Roger
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Old Dec 11, 2002, 09:00 PM
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no argument i thought you didn't understand
i have seen one to many accident -broken bits, ripped shirts,
splinters, larger red chips---(high school regional occupation program - Machine Shop) i learned alot from that class and am hoping for a sherline multilathe to apperar under the christmas tree this year---

yeah right
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Old Dec 11, 2002, 09:35 PM
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No worries there Kevin...


And in the spirit of xmas, here you go...
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Old Dec 11, 2002, 09:39 PM
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United States, FL, West Palm Beach
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Cutting carbon rods

I use the cutters from these folks and they work very well with clean cuts.
Of course, it only works on smaller stuff.
Click on the link and then select carbon cutter.
Chuck

http://www.airdyn.com/index.htm

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Old Dec 12, 2002, 03:36 AM
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ya crazy
are the tolarances on that as close(or loose) as they advertise?

how much did you pay
you can Instant Message me or leave it here

i am hopping that my mom gives me christmas money this year
she did last year but hasent said anything yet
but now i am 21 years old and too afraid to ask

crossing my fingers
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Old Dec 12, 2002, 05:02 AM
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Brussels, Belgium
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Before flying helis I flew/builded kites.

Put some tape on the carbon rod were you need to cut it.


Pierre
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Old Dec 30, 2002, 08:10 AM
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United States, NC, Franklin
Joined Dec 2002
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Re: Cutting carbon rods

Quote:
Originally posted by Bandikoi
I use the cutters from these folks and they work very well with clean cuts.
Of course, it only works on smaller stuff.
Click on the link and then select carbon cutter.
Chuck

http://www.airdyn.com/index.htm

Hi

do you know if any of these tubes at this site will replace the tail boom?

thanks, Jim (thehornetsmasher)
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