Alumilite with David Merriman
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Very interesting.
I have pressurizing equipment (compressor and a converted pressure cooker), but don't have a bell jar for degassing, and boy are those a price, if you can find some place that sells them over here!
For thin section, how about putting a few risers in at the sharp points, so any trapped air can escape and be squished out under pressure?
It means more clean up work, but that's no sweat for me, as I'm only making a few parts.
Another thing I thought of trying was to place the mould on a vibro plate (I have an old vibro saw which will work), and let that jiggle the air out, assuming the use of a slow cure PU resin. -
All viable means of catching the bubbles or chasing them out.
Oh, and finish that damn Beatles sub tooling ... I want one!
David,Who is John Galt?Comment
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Stop messing about - just get a Sub-driver!Comment
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Well I have the DVD, but I only got it for reference to fill in the missing pieces with the AMT/ERTL model.
Never understood what all the fuss was about to be honest, think you had to be on something to fully apprciate it.
I prefer the kinks anyway.........Comment
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[ATTACH=CONFIG]2344[/ATTACH]Dave I saw the video on casting resin and you said for a min of 29 hg for the vac chamber. with my new set-up
in the pic here i can only get 21.5 hg@5280ft alt. why 29hg? I have talked to other cast resin companys and they insist on 29hg!
Thanks Tom
You either pull 29" of Mercury or you're wasting your time. Good looking set-up you have there, but the pump ain't gonna get it done for you.
David,Who is John Galt?Comment
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I have already degassed some rtv (oomoo rtv from smooth-on) and it worked great! no bubbles at all! I thought i could get away with compensating for altitude out here. no worrys the pump was a free-be. the perks of being a driver for UPS:) anyway the problem i am having
with air is the cast resin. Ted and i have tryed alumalite but the stuff solidifies so fast we couldent work with it. I would be willing to give it another try though..Comment
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Careful, there are two formulas of the ALUMILITE polyurethane casting resin -- on fast cure (about a 30 second pot life) and a slower cure. The slow cure is what I use for production work.
David,Who is John Galt?Comment
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Alumalite's web site says
alumalite regular 90 sec pot life
alumalite white 2.5min
alumalite RC 3 3min
which one do you use DaveComment
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