Re: Casting a set of Vidor knobs
FAIL ONE:
Well, this initial mould was a definite fail so I'm not going to pretend otherwise. I think my problem was that I didn't use enough mould release spray, or perhaps I didn't allow it to dry for long enough.
Try as I might, I could not find my separation line at all. When a small line eventually started to open up I assumed I had found it so I separate it there.
As you can see, this was way off. The two halves were well and truly bonded together.
So, as far as the Silicone I used and the method of degassing and pressurising in the pressure pot, it worked perfectly - I don't see a single bubble where it matters.
Clearly, I need to start again with this, but I'm confident that when I sort out the release spray thing, it will work out well. Maybe I need to get a better quality release spray. I used one at £6 per can, rather than the higher priced recommendation at £14 per can, so I will look into that.
Watch this space, as they say. No point skipping this failure to show a perfect mould because that isn't what I got, but even though this was a failure, it was a partial success and I now know that the mould is good other than the fact that both halves became bonded together. I'll go away and work on that and I will return when I'm ready to colour some resin and cast a knob.
__________________
Jon.
|