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Low Earth Orbit
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New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Mark Wilkinson" data-source="post: 139009" data-attributes="member: 8989"><p>Re: New DIY Mid High</p><p></p><p></p><p></p><p>Do you know the weight of the 17mm ply you used? I'd like to get a sense of my expected total weight as compared to yours...figuring a box uses just short of 20 sq ft fully braced..</p><p></p><p>There are 3 thickness of baltic birch available here, very reasonably priced. 18, 15, and 12mm. They weigh about 2.6, 2.1, and 1.7 lbs/sq ft respectively.</p><p>I can also order Auraco 19mm at 1.63 lb sq ft, but the denser, more # of plies, BB is so much easier to make precise cuts with.</p><p>I'm hoping thinner and denser works as well as thicker and lighter....where's Young's modulus numbers when we need em lol</p><p></p><p>I'd like to use 15mm for the back, mid horn parts, and the12" and 950 baffles.</p><p>And 12mm for the sides and top/bottom...that would save 5lbs vs 15mm.</p><p>I'm hoping to use removable side to side braces in the horn chamber. Braces that could go in after the 12" drivers are mounted, before the horn assembly drops in...??</p><p>Thinking about using 5/4" closet rod of an equivalent cross sectional area rectangular stick. About 0.6 L in volume...</p><p></p><p>Speaking of volume...is it critical? Does concern need to be given to volume taken by handles and this brace idea?</p><p>I ask because i saw white suffing in one of your picts and i think i remember reading it is sometimes used to increase effective chamber volume...</p><p></p><p>Like I said to Don....sorry for all the questions...thx!</p><p>Mark</p></blockquote><p></p>
[QUOTE="Mark Wilkinson, post: 139009, member: 8989"] Re: New DIY Mid High Do you know the weight of the 17mm ply you used? I'd like to get a sense of my expected total weight as compared to yours...figuring a box uses just short of 20 sq ft fully braced.. There are 3 thickness of baltic birch available here, very reasonably priced. 18, 15, and 12mm. They weigh about 2.6, 2.1, and 1.7 lbs/sq ft respectively. I can also order Auraco 19mm at 1.63 lb sq ft, but the denser, more # of plies, BB is so much easier to make precise cuts with. I'm hoping thinner and denser works as well as thicker and lighter....where's Young's modulus numbers when we need em lol I'd like to use 15mm for the back, mid horn parts, and the12" and 950 baffles. And 12mm for the sides and top/bottom...that would save 5lbs vs 15mm. I'm hoping to use removable side to side braces in the horn chamber. Braces that could go in after the 12" drivers are mounted, before the horn assembly drops in...?? Thinking about using 5/4" closet rod of an equivalent cross sectional area rectangular stick. About 0.6 L in volume... Speaking of volume...is it critical? Does concern need to be given to volume taken by handles and this brace idea? I ask because i saw white suffing in one of your picts and i think i remember reading it is sometimes used to increase effective chamber volume... Like I said to Don....sorry for all the questions...thx! Mark [/QUOTE]
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