Rubber parts out of polyuretan for -69 Imp.

OldWarHorse300

OldWarHorse300

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Here's some parts for my -69 Le Baron project. LCA bushings and rear spring isolators are no longer available so I decided to try to make these and some other parts . First I did measuring for 3D modeling, luckily these was simple parts and easy to make with Solidworks . After that it was time for CNC routing , mdf block works for casting mold. Isolators needs two part mold.
Mold surface is painted with 2-part polyuretan topcoat for easy releasing. Metal parts must be sandblasted with coarse sand and clean as possible. Metal needs special primer layer before polyuretan casting. Casting material hardness is A70 , like car tire or maybe little stiffer .
Casting is made by guy who is working with this material. This is very fast 2 component mixing, pot life/ reaction time is only 20 seconds! So there is no time for hesitation..
I'm very happy with a result, parts fits in place nicely.
Regards,
Mika

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Funny, Just yesterday, I was watching a YouTube video on casting your own polyurethane suspension bushings using 3d printed molds.

FWIW:

 
I need lower control arm bushings. I sent spec drawings to firm feel last week to see if they could make some replacement bushings. Frank was happy to get the drawings and said he is going to see what he can do about making up obsolete bushings. But you are a hero. I am beyond impressed. Clap clap.
 

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Boydsdodge said:
I need lower control arm bushings. I sent spec drawings to firm feel last week to see if they could make some replacement bushings. Frank was happy to get the drawings and said he is going to see what he can do about making up obsolete bushings. But you are a hero. I am beyond impressed. Clap clap.
Click to expand...
...hero...heh, don't know about that but thank you!
About bushings..Rare Parts used to make these but not anymore. I did 2 sets of bushings, one with old metal parts and one with new ones, just in case.
 
This is Great! Thanks for posting. Your results are obviously professional grade or even better!

I am working on casting a PU transmission mount for my '66.

After much googling I ended up ordering Shore A hardness 40 from siliconesandmore in Holland. I read that original rubber mounts were Shore A 45-55, but not sure of the credibility of that statement.

I have experience with casting epoxy and making the silicone and metal molds for this, but no experience with polyurethane at all.

Can you elaborate on the primer for the metal parts? Is there somewhere I can buy this in EU? What brand name do I need to search for?

Most urethane is sold for making molds for toys etc., so not a lot of info online for making mounts and adhesion to metal. I thought about making some internal locking features to prevent the metal and PU from separating.
 
patinated_imperial said:
This is Great! Thanks for posting. Your results are obviously professional grade or even better!

I am working on casting a PU transmission mount for my '66.

After much googling I ended up ordering Shore A hardness 40 from siliconesandmore in Holland. I read that original rubber mounts were Shore A 45-55, but not sure of the credibility of that statement.

I have experience with casting epoxy and making the silicone and metal molds for this, but no experience with polyurethane at all.

Can you elaborate on the primer for the metal parts? Is there somewhere I can buy this in EU? What brand name do I need to search for?

Most urethane is sold for making molds for toys etc., so not a lot of info online for making mounts and adhesion to metal. I thought about making some internal locking features to prevent the metal and PU from separating.
Click to expand...
Thank you Sir!
....about your project ,I don't know but A 40 sounds a little soft to me, but remember I'm not the specialist here..Like I said, casting was made by professional guy, and he got a materials. I think it's better find industrial quality material supplier, they should know right materials for you. Clean surface and primer are most important here, I think internal locking won't help you if PU doesn't stick to the surface.
Hope this helps a little,
Mika
 
OldWarHorse300 said:
Thank you Sir!
....about your project ,I don't know but A 40 sounds a little soft to me, but remember I'm not the specialist here..Like I said, casting was made by professional guy, and he got a materials. I think it's better find industrial quality material supplier, they should know right materials for you. Clean surface and primer are most important here, I think internal locking won't help you if PU doesn't stick to the surface.
Hope this helps a little,
Mika
Click to expand...

Thanks - I don't want to hijack your thread further :) . I have a few suppliers I can call for advise and pretend I want to buy PU and primer in bulk ;-), but if you happen to know the brand name of your friend's primer, that would be a big help.
I hope you will let us know how the A 70 LCA bushings and isolators feels like driving the car (too stiff or just right?)
 
patinated_imperial said:
Thanks - I don't want to hijack your thread further :) . I have a few suppliers I can call for advise and pretend I want to buy PU and primer in bulk ;-), but if you happen to know the brand name of your friend's primer, that would be a big help.
I hope you will let us know how the A 70 LCA bushings and isolators feels like driving the car (too stiff or just right?)
Click to expand...
No problem, I can ask, will take a few days..
..and I will let you guys know how these parts works...but that will take more than few days :p!
 
You know what, Mika. I really think you should do a few sets extra, just to test the market for these. Nobody else is making them, as you know. - Just a thought.
 
330dTA said:
You know what, Mika. I really think you should do a few sets extra, just to test the market for these. Nobody else is making them, as you know. - Just a thought.
Click to expand...
Yeah, you're right. Now I have molds and knowledge how to do it. Still I want see how is the final fitment and how these works in action..
 
Really impressive work, Mika! Again.

Although, some of these parts are available. I know the rear spring isolators, the bump stops and the pinion snubber bumper are available. But that's not the point here, right?. I know that very well ;)
 
vdk2010 said:
Really impressive work, Mika! Again.

Although, some of these parts are available. I know the rear spring isolators, the bump stops and the pinion snubber bumper are available. But that's not the point here, right?. I know that very well ;)
Click to expand...
Thanks Julian..again :)
I know, some parts are available, however I couldn't find -69 spring isolators, -72 and up yes, but it seems to be different? Anyway, LCA bushings are no no and torsion bars support bar isolators are also problem,so I think at the same time, why not doing other parts too.
 
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