Gluing 'Hard' plastics
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Gluing 'Hard' plastics
I am not sure if this question has been asked before, but here goes! I have broken off the steps on a Heljan Class 14 loco. I am looking for some advice on the best type of glue to reattach the steps? I have tried an epoxy and a superglue. Both intialy seem to work but the slightest pressure and the joint breaks! Any advice would be appreciated
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Re: Gluing 'Hard' plastics
Try a solvent on a non visible part of the model - to determine which one to use.
ABS solvent may work?
ABS solvent may work?
Tim V
(Not all railways in Somerset went to Dorset)
(Not all railways in Somerset went to Dorset)
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Re: Gluing 'Hard' plastics
It isn't possible to offer any informed suggestions on solvents without, as Tim implies, knowing what sort of plastic is involved. However, either epoxy or superglue [or both] would usually work, so I wonder just how much contact area is actually involved here. Modern steps are commonly fairly thin, resulting in a small contact area, so it may be necessary to use some form of reinforcement behind the break.
Regards
Noel
Noel
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Re: Gluing 'Hard' plastics
I'd epoxy a piece of fret waste over as much of out of sight area. As Noel says, reinforcement is necessary.
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Re: Gluing 'Hard' plastics
A useful idea, if the steps are thick enough, is to pin the two parts together. Drill a small hole, 0.45mm or 0.3mm, in one side of the break and another in the corresponding place on the other part. It might be difficult to judge so as to get the holes in exactly the right place. The parts are then glued together in the usual way.
For difficult plastics, I always give a coating of Deluxe Materials Tricky Stick which somehow prepares the surfaces and superglue and epoxy seem much happier to stay put.
Philip
For difficult plastics, I always give a coating of Deluxe Materials Tricky Stick which somehow prepares the surfaces and superglue and epoxy seem much happier to stay put.
Philip
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Re: Gluing 'Hard' plastics
Gentlemen,
Many thanks for all your replies. I must admit i was a bit shy of trying the pin and glue method on such a small part, but having seen the replies and given it more thought, I will give it a go as it seems to be the most logical way around the problem, maybe with some small re enforcing strips behind the steps as well.
Many thanks for all your replies. I must admit i was a bit shy of trying the pin and glue method on such a small part, but having seen the replies and given it more thought, I will give it a go as it seems to be the most logical way around the problem, maybe with some small re enforcing strips behind the steps as well.
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Re: Gluing 'Hard' plastics
Belt and braces........
Re: Gluing 'Hard' plastics
Cors you could always try welding the bits of plastic.....
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Re: Gluing 'Hard' plastics
Having glued a lot of Lima side frames to things I've found evostick first then thin zap (the pink bottle) gives a good solid result. Let the evostick dry first.
HTH
Jim
HTH
Jim
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Re: Gluing 'Hard' plastics
Thanks for the subsequent suggestions. I'm not sure about the 'welding' idea, having watched the 'film' it would appear to leave a very 'coarse weld', and the steps need something very fine just on the mating surface, with maybe some re enforcement on the rear which would not be visible. I'm leaning towards the 'pin and glue' idea which should be strong and not visible, with maybe a couple of re enforcing strips on the rear..... if i'm accurate enough with the drill and economic with the epoxy!
Re: Gluing 'Hard' plastics
You don't have to use the 2.5mm rod used in the video, you could use something much finer, like 1mm, though you would have to keep it short to ensure that it could be forced against the substrates.
Probably the best solution to broken steps is to glue short lengths of angle brass behind the plastic step. Or even better substitute a whole built up step arrangement for the plastic mouldings, but of course you would have to replace all the steps on your loco.
Probably the best solution to broken steps is to glue short lengths of angle brass behind the plastic step. Or even better substitute a whole built up step arrangement for the plastic mouldings, but of course you would have to replace all the steps on your loco.
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Re: Gluing 'Hard' plastics
Doh! Why didn't i think of brass angle behind the steps! Thanks Bill
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Re: Gluing 'Hard' plastics
Dave
You aren't the first person to mention the fragility of the steps on the Class 14. Rod Hall and myself paid a visit to Dean Forest railway and measured up the steps to form the basis of an etch :
Justin Newitt had them etched for me and Rod has since fitted them to the 14. These rely on the pin and glue method. I gave Justin the file, which he was - at some stage - going to add to his website. You could always ask him if he's prepared to get another set etched.
regards
Mike
Edited to add photos
You aren't the first person to mention the fragility of the steps on the Class 14. Rod Hall and myself paid a visit to Dean Forest railway and measured up the steps to form the basis of an etch :
Justin Newitt had them etched for me and Rod has since fitted them to the 14. These rely on the pin and glue method. I gave Justin the file, which he was - at some stage - going to add to his website. You could always ask him if he's prepared to get another set etched.
regards
Mike
Edited to add photos
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Re: Gluing 'Hard' plastics
Mike , thanks for the suggestion
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