TimC
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| posted on 20/10/13 at 04:28 PM |
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Carbon fibre rod for gearshift mechanism?
I'm thinking of using 8mm pultruded carbon rod and bonded-on fittings for my gear-change mechanism.
Does anyone have any experience or advice?
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liam.mccaffrey
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| posted on 20/10/13 at 04:59 PM |
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What would the benefit be Tim, weight?
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steved
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| posted on 20/10/13 at 06:12 PM |
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they take a lot of abuse ,cant see it working and the weight saving over alloy rods wont be much ,though no harm in trying
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TimC
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| posted on 20/10/13 at 06:32 PM |
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Maybe, but also no welding and painting - potentially something that I can do in the house one evening.
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steved
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| posted on 20/10/13 at 06:41 PM |
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you shouldnt need to weld the alloy rods just tap the ends and screw in rosejoint ,simples
i just cant see carbon working with bonded ends ,very happy to be proved wrong though 
[Edited on 20/10/13 by steved]
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TimC
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| posted on 20/10/13 at 07:01 PM |
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quote:
Originally posted by steved
you shouldnt need to weld the alloy rods just tap the ends and screw in rosejoint ,simples
i just cant see carbon working with bonded ends ,very happy to be proved wrong though
[Edited on 20/10/13 by steved]
Maybe - I'm using some serious adhesive - This stuff will happily stick steel to
GRP
I may give it a go - if it breaks on the shake-down, so be it.
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Thatcher
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| posted on 20/10/13 at 08:00 PM |
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I plan to do the very same thing with some 10mm UD or uni directional carbon fibre tube and make a collar out of ally for the gbox lever and bond it
together with Loctite's C2 heat cure adhesive but not for a while yet. Check out my pre preg carbon fibre gear knob post to see some pics.
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Duncan36
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| posted on 20/10/13 at 08:55 PM |
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Tim you'll have to make sure the carbon is high temp. We had problems with the pushrods on a Jordan as the originals weren't made with
high temp resin and one failed due to the heat.
www.acorn-printing.co.uk
www.tshirtuk.com
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twybrow
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| posted on 20/10/13 at 11:25 PM |
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No issue with this at all. The only concern is you get you fittings on the end to be a snug fit, and your bond line wel defined with a decent
adhesive. The downside of using a pultruded rod is that as a solid lump of carbon and epoxy, they are not the most efficient structure - ie with the
same amount of resin and fibre, you could make a far stiffer rod if it were hollow (I am assuming here you are using a solid rod, as opposed to a
tube?).
Strangley enough I was playing with some of this yesterday, to clean resin out from inside a pipe. We make the stuff in 5-15km rolls to use as the
main load bearing structure within high voltage overhead power lines. It is VERY good in tension, and when constrained in a sleeve, it can take a huge
compression load too (buckling is your enemy).
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Autoflock Motorsport
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| posted on 21/10/13 at 07:48 AM |
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you could still tap and thread the ends combined with 3m 8115 panel bond, it will go no where. Does the shape have to be tube? why not make a bespoke
part which is suited to the exact needs?
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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