Large 37ltr mould and questions on safely and successfully casting.

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Large 37ltr mould and questions on safely and successfully casting.

Large 37ltr mould and questions on safely and successfully casting.

Author	Message
ChrisR	ChrisR posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 363, Visits: 3K	50mm!! you're not building a submarine hull!!
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Shinobiwan	Shinobiwan posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 14, Visits: 97	ChrisR (29/12/2016) 50mm!! you're not building a submarine hull!! Overkill? OK well how best to add mass and thickness? Edited 9 Years Ago by Shinobiwan
	Reply Like 2
ChrisR	ChrisR posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 363, Visits: 3K	I think you need to post the dimensions of the thing including hole size etc (or pm of you don't want to make that public) if you want any specific advice.
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Shinobiwan	Shinobiwan posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 14, Visits: 97	Dimensions are approx 800mm x 550mm x 185mm. Really important question: What's the shrinkage like on Polyester, Vinylester and Epoxy laminating resins? With holes and critical parts fitting together during assembly the shrinkage really needs to be less than 1%.
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Shinobiwan	Shinobiwan posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 14, Visits: 97	I've been looking into this more thoroughly and I believe I can do way with the two parts joined together and instead simply go for a thicker layup on a single mould to achieve a similar result. Surface finish inside the part is irrelevant aside from cosmetic considerations and that's all I'd really be gaining from going the two part route. I do have some more questions though. What's the shrinkage like on polyester and epoxy. Looks to me like polyester can be around 6-9%. I need to be under 1% for things to fit. Any way to improve this on polyester since epoxy is much more expensive. Can I use Unimold Tooling Resin for layup of parts since its cheaper than epoxy and no shrinkage unlike normal polyester resins. How much ATH filler is it possible to add to epoxy laminating resin in order to reduce costs? Which matting to use? Alternate Woven Roving and 450g CSM? Loudspeaker cabinets need stiffness and damping. Mass helps. What's the maximum safe thickness to laminate in one sitting? I've heard around 12mm Can I brush in polyester pattern coat primer in mould prior to lay up? Construction is a clamshell. What's the best way to glue to halves together with gelcoat at the interface. Thanks for any advice. Edited 9 Years Ago by Shinobiwan
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ChrisR	ChrisR posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 363, Visits: 3K	1) shrinkage is variable, use as a guide but the test is normally done without reinforcement, this reduces shrinkage hugely. 2) don't know, I don't use it 3) don't know, I never use fillers 4) if using epoxy then woven roving/woven fabric (or powder bound CSM as normal CSM doesn't work with epoxy) 5) resin dependant, I'd be looking to pot a core in to stiffen and reduce cost, if using PE then 3/4 layers tops 6) don't know, I don't do it 7) loads of joining techniques to choose from, skill dependent. easiest will be butt jointed with reinforcement backing on the B-side to join together, if you get better at it then a scarf joint will be 1000% better
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