I am not sure is roller skate wheels use the same scale.JMF wrote:With a shore hardness of 90 what could you compare it to in the real world. A roller skate wheel? Can you dig your finger nail into it? Did you de-gas your pots or would they go off to quickly?
I also only used poured rail method couldn't be bothered with gluing ABS to much effort. I used plain old epoxy without fibers for my rails. I was always a bit wary of adding any type of chopped fiber to my pots, theory being that it would make rails to brittle.XSwind wrote:Yup roller skate wheels use the same scale.JMF wrote:With a shore hardness of 90 what could you compare it to in the real world. A roller skate wheel? Can you dig your finger nail into it? Did you de-gas your pots or would they go off to quickly?
Basically if you are going to give the PU system a go, you should be looking at a shore hardness of 90 ish, lesser the number softer the cured results.
FYI, I have never added any micro fibres to my mixes and as yet had no cracking or failures.
Give it a try, its a revolution for speeding up production.
Forgot to say Make sure you scuff the PU with 40 grit before laminating the skins on.
Degassing not really needed and I dont do it myself, my Pu is as thin a condensed milk and flows without any major bubble issues.
My PU starts to go off in 60 seconds so its a bloomin rush getting it poured but not too bad, no failures yet but with such a quick time you need not really mix in small batches.
Forgot to say, no you cant dig your nails into it, its hard but retain a little flexability over length especially in 4mm x 12.5mm thicknesses.
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