I have been reading the blog for a long time, but this is my first post in the discussion board. Your help will be greatly appreciated.
I am working on an basketball shoe project. I want to hand make my own working prototype shoe.
I have taken a mold of my feet to work off as a last. I am now in the process of hand sculpting what I want the midsole and outsole to be.
I want to use these to make a mold that i can then use to make usable shoe parts.
How can I do this?
What materials would you recommend to use for the mold.
And then how can I get liquid vulcanized rubber for the outsole and / or polyurethane for the midsole to make the parts out of.
the only thing that comes to mind is plastisol… i haven’t done it myself so not sure if it would be perfect for your application but it’s at least worth reading about. I think you need to heat it to ~400F.
But it’s PVC, so don’t use anything you will ever use again for food.
The “hardness” of engineered materials is a measurement of durometer. There are two scales; Shore A and D. The Shore “A” scale is the measurement system used for “soft” materials (a skate board wheel); Shore D is for “hard” materials (a hard hat, or cellphone housing). There is actually a third Shore scale; OO. Chewing gum would be Shore OO.
Here are two hits from a “Shore A urethane casting materials” google search:
Urethane materials can be cast at room temperatures into silicone RTV molds. It can also be used as a mold making material itself. It’s a really aggressive material (meaning it likes to lock onto mold materials) and a suitable mold release should be used even with silicone molds; especially if your part is intricate (like the tread pattern on a shoe sole). You would have to have an original “pattern” to cast your RTV tooling onto.