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Topic: Button pad out of silicone or rubber (Read 8 times) previous topic - next topic

funkyguy4000

Hello!

I'm trying to recreate the button pad here https://www.sparkfun.com/products/7835
I've already got mold made out of wood but I need to know what kind of product I should get to pour over it to make the rubber pad.
I don't own the product.

Anybody have any ideas?
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Far-seeker

There are probably some artifical rubber formulations specifically for casting available through arts & crafts stores/catalogs.  Unfortunately I don't have any experience in that area, so I can't make any direct recommendations. 

cr0sh

Liquid casting silicone (and appropriate release) would probably be best - let me dig in my bookmarks...

http://www.smooth-on.com/

They may have something you could use. What do you plan on using for the conductors on the pads? Or do you have a different solution for the switching?
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funkyguy4000

#3
Aug 14, 2012, 06:06 am Last Edit: Aug 14, 2012, 02:35 pm by funkyguy4000 Reason: 1
I'm not sure what to use for the conductors.  I don't understand what they mean when they say Part A and Part B.  Isn't it just one product?

EDIT: Also, If I had a RepRap, could I not just print a 3-d Plastic mold and then just pour it in there?
Accelerate to 88 miles per hour.

cr0sh


I'm not sure what to use for the conductors.  


Those black rings you see on the part from SparkFun are likely the conductors - generally they are carbon-impregnated rubber (not sure where or if you can easily buy that - but I bet some googling would turn up something). You mainly want something that isn't going to corrode or degrade over time. You might be able to make your own by following something like this:

http://www.instructables.com/id/Make-Conductive-Glue-and-Glue-a-Circuit/
http://www.inklesspress.com/conductive_glue.htm


I don't understand what they mean when they say Part A and Part B.  Isn't it just one product?


Some silicone molding compounds are two-part mixes; some must be measured by volume, some by weight (make sure you're clear on this when you purchase). Basically, one part is the liquid rubber and the other is the "curing compound" - similar to 2-part epoxy. Other silicones are single part compounds containing a volatile chemical that evaporates out as it cures (just like silicone glue/sealant - in fact, you might try that first; just brush it into your mold; though I don't know what you can use as a release agent, which you'll want no matter what compound you use).


EDIT: Also, If I had a RepRap, could I not just print a 3-d Plastic mold and then just pour it in there?


Yes, you could.
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

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