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Old Mar 12, 2012, 07:34 AM
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Portugal
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Question
glue question

What's the best glue for aluminium to plastic?


thanks
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Old Mar 12, 2012, 10:06 AM
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Stabilit Express, or a 2-part acrylic adhesive.

In the U.S. I use these; available from auto part stores.
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Old Mar 12, 2012, 10:40 AM
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Portugal
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Thanks for your reply... Will try to find out an equivalent glue here...
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Old Mar 12, 2012, 10:52 AM
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You could try Polyurethane glue or CA too. I would rough up both surfaces also. You did not say what type of plastic. Polyethelene and nylon can be difficult to glue. I think CA (cyano-acrylate) melts styrene plastics.

Jake
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Old Mar 12, 2012, 10:55 AM
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Indeed it's nylon...
Gorilla glue can't be used here?
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Old Mar 12, 2012, 11:05 AM
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Quote:
Originally Posted by HF_ATL View Post
Indeed it's nylon...
Gorilla glue can't be used here?
Then forget the 2-part acrylic! Can you be more specific as to exactly what you're attempting to do? A photo of the intended assembly, or repair?
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Old Mar 12, 2012, 11:10 AM
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Atm, I don't have any photo... But the idea it's for gluing a small alu circle to a nylon fuselage. Motor will be attached to that circle via screws.

I'm also thinking in using screws together with glue to hold that alu circle to the fuselage.
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Old Mar 12, 2012, 11:39 AM
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Quote:
Originally Posted by HF_ATL View Post
Atm, I don't have any photo... But the idea it's for gluing a small alu circle to a nylon fuselage. Motor will be attached to that circle via screws.

I'm also thinking in using screws together with glue to hold that alu circle to the fuselage.
I've not heard of nylon being used for a fuselage before. In any case, you have a slippery plastic. In your case I'd use a urethane adhesive such as GOOP. Not sure what is available for you, but you should be able to find GOOP, or similar, in a home improvement, or craft store.
Sand the matting surfaces of the aluminum and nylon and apply adhesive as per instructions and let dry for several days. And yes, use screws.
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Old Mar 12, 2012, 03:39 PM
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Difficult to comment without really seeing the problem, but why bother with glue at all? I assume the aluminium is to stop the motor damaging the nylon? Could you simply use longer mouting screws that pass through the motor mount, the aluminium circle and the fuselage and some washers and bolts inside the fuselage to hold it all together?
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Old Mar 12, 2012, 05:52 PM
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Roughen the plastic with some 80grit paper,apply a bead of silicon sealant in the centre and then press your roughened alloy disc into place, attach with 4 small self taping screws.
I have used this method to hold plastic floats to the alloy struts on seaplanes with great success. On fibreglass the gell coat separates when you try to remove the floats
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Old Mar 12, 2012, 07:07 PM
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First of all thanks for all your feedback here!

So, here is my issue...
That X cross is from the original motor mount pack.
The idea is to attach a bigger alu plate (circle) so that it covers all the nose plus a margin...
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Old Mar 12, 2012, 08:14 PM
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Ah an AXI motor. Are you going to backmount it or mount it inside the fuselage like an inrunner?

I would here make a firewall that is smaller than the plane's nose but bigger than the hole in the front of the fuselage and glue it in from behind, maybe with epoxy or something like gorilla glue, and then screw the motor in from behind the firewall, which can't go out the front because the firewall is pulling the fuselage.

You could make the firewall out of decent 1/8 birch plywood too. If its nylon probably a rubber based glue like Walthers Goo or contact glue might work. even Phenoseal adhesive caulk. I do not know where in Portugal you can get this. Maybe even Hot Melt Glue
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Old Mar 12, 2012, 08:52 PM
Guz
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Agreed on making a "firewall". Use some G10 (aka circuit board base), it's a glass epoxy laminate. Strong and lightweight, and can be epoxied in, then drill the holes for the motor mount.
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Old Mar 12, 2012, 09:35 PM
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HI HF_ALT

You need the following
http://www.espritmodel.com/cb-motor-mount.aspx
or you can just make your own from plywood.

Frans
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Old Mar 13, 2012, 06:27 AM
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Thanks for all the suggestions...

The motor is a brushless outrunner, an axi 2820/12.
I also have considered using plywood instead of alu. The only reason I firstly thought using alu is due to better heat dissipation as the motor can get quite hot. However, plywood will be much easier to attach to the fuselage (supposedly).

I've white gorilla glue, hot glue, and epoxy to try out. Maybe I can also try using pcb board I've laying around (not sure if it can really handle the motor without breaking).
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