Re: 21-23 series rubber sill plates.
Posted by HH56 On 2014/12/6 11:23:05
Progress report on the sill moldings.
Am on the right track but have a ways to go. Made another test piece. Used the 48 sill as a starting point and cast that in silicone and then made a plaster copy. Found one of the old 47 sills with somewhat decent but not great detail left in the name portion. Maybe with a little more fine tuning it will work but would be nice to find a better one. Cast the name off that 47 piece and then cut and joined name sections. Narrowed and split the 48s wide inside rib and then added another long narrow rib using an acrylic strip to get the 47 pattern. Cast a new silicone mold using that composite plaster model as the pattern.
Recast the sill and was not so pleased with the second test piece because the material I used cured full of bubbles. I don't have a proper strength pressure container for holding something large and not sure vacuum and a vacuum bag would work. The next step is find a different and decent open air casting compound in 80 to use that doesn't require vacuum or pressure to eliminate bubbles. The first test piece I made with the 40 material cast out nicely with no special technique but that formulation doesn't come in 80 -- only as high as 60.
Attach file:
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Am on the right track but have a ways to go. Made another test piece. Used the 48 sill as a starting point and cast that in silicone and then made a plaster copy. Found one of the old 47 sills with somewhat decent but not great detail left in the name portion. Maybe with a little more fine tuning it will work but would be nice to find a better one. Cast the name off that 47 piece and then cut and joined name sections. Narrowed and split the 48s wide inside rib and then added another long narrow rib using an acrylic strip to get the 47 pattern. Cast a new silicone mold using that composite plaster model as the pattern.
Recast the sill and was not so pleased with the second test piece because the material I used cured full of bubbles. I don't have a proper strength pressure container for holding something large and not sure vacuum and a vacuum bag would work. The next step is find a different and decent open air casting compound in 80 to use that doesn't require vacuum or pressure to eliminate bubbles. The first test piece I made with the 40 material cast out nicely with no special technique but that formulation doesn't come in 80 -- only as high as 60.
Attach file:
(62.91 KB)
(44.98 KB)
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