Gluing Carbon fiber

[PBO]

I'm not familiar with T4 CF chassis although I'm guessing it's the carbon variation rather than the carbon fibre...??

It might also mean you're considering gluing cut pieces 'end on' to the sheet? this isn't the strongest way of completing a join but if you take a few cues from boat guys & drill a series of small holes along the bottom edge for the resin to run through it should provide additional strength

[crazyjr]

Originally Posted by PBO

I'm not familiar with T4 CF chassis although I'm guessing it's the carbon variation rather than the carbon fibre...??
The only available T4 CF chassis is the factory team molded one

It might also mean you're considering gluing cut pieces 'end on' to the sheet? this isn't the strongest way of completing a join but if you take a few cues from boat guys & drill a series of small holes along the bottom edge for the resin to run through it should provide additional strength basically what i am planning to do, I may even go with alumnium standoffs If gluing the CF isn't strong enough

Comments in red in quote

[pinkpanda3310]

Whilst exotherm is a valid point and something I didn't know about, I don't think we need worry about it in rc applications. The link you gave us is for more industrial applications. I can't see a 2-3mm bead of epoxy heating itself to the point of decomposition.

Was interesting to learn about though

[KaztheMinotaur]

The cheap Hobby King epoxy will do that if it too thick.

[PBO]

Originally Posted by pinkpanda3310

Whilst exotherm is a valid point and something I didn't know about, I don't think we need worry about it in rc applications. The link you gave us is for more industrial applications. I can't see a 2-3mm bead of epoxy heating itself to the point of decomposition.

Was interesting to learn about though

Epoxy is epoxy it doesn't discriminate between RC & other applications

The melodramatic Gurit summary aside, what exotherm means is a compromised bond, how much depends on a few factors. If you think cooking your Araldite in your Kingswood at 40-50 celcius is a good idea, then who am I to stand in the way of backyard theories!! I sense that crazyjr probably doesn't want his gluing to come 'unstuck' if he can avoid it though & slower, moderate temps gives better results

[KaztheMinotaur]

Where is a good place to buy CF at?

[crazyjr]

Originally Posted by KaztheMinotaur

Where is a good place to buy CF at?

not sure right now, I got mine from graphite-girl on Ebay about three years ago

[pinkpanda3310]

Originally Posted by PBO

Epoxy is epoxy it doesn't discriminate between RC & other applications

The melodramatic Gurit summary aside, what exotherm means is a compromised bond, how much depends on a few factors. If you think cooking your Araldite in your Kingswood at 40-50 celcius is a good idea, then who am I to stand in the way of backyard theories!! I sense that crazyjr probably doesn't want his gluing to come 'unstuck' if he can avoid it though & slower, moderate temps gives better results

I was referring more to the volume/mass of epoxy being used ie- a smaller quantity spread more thinly would dissapate heat better. When I did my stuff the glue might have been 1/10mm thick between the cf sheets?? The excess was wiped so that might have been 1/2mm.

IDK maybe I've been lucky it hasn't caused me any problems

[PBO]

Originally Posted by pinkpanda3310

I was referring more to the volume/mass of epoxy being used ie- a smaller quantity spread more thinly would dissapate heat better. When I did my stuff the glue might have been 1/10mm thick between the cf sheets?? The excess was wiped so that might have been 1/2mm.

IDK maybe I've been lucky it hasn't caused me any problems

You're right about heat dissapation but generally speaking epoxy resins don't like being heated - it reduces the strength of the resin

The ideal temp window (generally speaking) is between 10 - 35 celcius...this is for ambient, resin & substrate equally

When you go above or below the resin looses strength

[crazyjr]

Ok guys, one last question. What would happen if i used super glue (cyanoacrylate), to set the parts in position, then used the epoxy for final setting? Is there a chemical reason not to?

thanks guys, this is a good discussion.