HDBRbuilder Posted January 3, 2009 Share Posted January 3, 2009 John, I hate working with MDF, I am a woodworker...I saw wood to make sawdust, I don't saw sawdust to make wood, follow me? As for woodscraps, that's what you use to heat the workshop or fuel the cookstove, so they aren't wasted and still maximize the harvest. Gotta love all of them"green" alternatives! Remember how good a deal we got when they took lead outta exterior paint? "How stiff is stiff enough?" Sounds like a SLOGAN...yep, a slogan for little blue pills!! Quote Link to comment Share on other sites More sharing options...
Don Richard Posted January 3, 2009 Share Posted January 3, 2009 Wilson's speakers are made of virtual concrete with bits of wood thrown into the mix. The recent issue of The Absolute Sound where they reviewed one of Wilson's speakers, in the How It's Made sidebar, states that "there are no wood products in the X material". Quote Link to comment Share on other sites More sharing options...
John Warren Posted January 3, 2009 Share Posted January 3, 2009 From the Wilson Audio Website- " X material is a phenolic resin, as rigid as steel butwith much greater internal damping". Firstoff, of ALL the phenolic materials manufactured NONE of them are EVENclose to the elastic modulus of a typical steel (30x10^6 PSI) so thatline is a marketing thing. Phenolics are thermoset polymerics, thereare many, many types. If any of you are old enough to remember"Bakelite" or "Micarta" then you have some idea what a phenolic is. Regardingthe internal damping, MDF also has "much greater internal damping"relative to steel (or any metal for that matter even lead which isclose to it's melting point at room temp). Having said that, Ilike the idea of using phenolics for enclosures. Fibers and fillerscan be incorporated into the batch to tailor the composite to theapplication. They're densities are similar to aluminum but without thephonon transmission problems, again a good thing. The downside is thatthe raw materials used to make them are expensive. They are exceedinglytough on cuttting tools. They're "glued" together using epoxies orpolyester resins again, expensive and maufacturing hassles. Quote Link to comment Share on other sites More sharing options...
HDBRbuilder Posted January 3, 2009 Share Posted January 3, 2009 Andy - Where will you be in the Phil.? There's some nice areas to live over there. Bruce I'll be living on Panglao Island in Bohol Province in the southern Visayas, my wife's home island, where I get to do this for daily exercise: Quote Link to comment Share on other sites More sharing options...
Marvel Posted January 3, 2009 Share Posted January 3, 2009 Nice! My gf (with me in my avatar on a trip to Ireland in August) is from Palawan. Neither of us swim, lol. I'm not sure yet just where we will end up. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted January 3, 2009 Share Posted January 3, 2009 Plastics, the Future is Plastics.... -line from 'The Graduate' http://www.freshpatents.com/Loudspeaker-plastic-cone-body-dt20060706ptan20060147081.php Strangely enough, the patent attorneys are headquartered in Indianapolis, but the inventors are not name I'm familiar with. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted January 3, 2009 Share Posted January 3, 2009 Here Doc, from 1967 Mr. McGuire: I just want to say one word to you - just one word. Ben: Yes sir. Mr. McGuire: Are you listening? Ben: Yes I am. Mr. McGuire: 'Plastics.' Ben: Exactly how do you mean? Mr. McGuire: There's a great future in plastics. Think about it. Will you think about it? Ben: Yes I will. Mr. McGuire: Shh! Enough said. That's a deal. Quote Link to comment Share on other sites More sharing options...
John Warren Posted January 3, 2009 Share Posted January 3, 2009 1" thk x 4' x 8' = $1100 This is a phenolic sheet with linen fiber reinforcement. (I apologize for making some sort of attempt to keep the discussion on enclosure materials) http://www.jjorly.com/phenolic_machining_fabrication.htm Quote Link to comment Share on other sites More sharing options...
HDBRbuilder Posted January 3, 2009 Share Posted January 3, 2009 You're too damned serious about things, John, loosen up a bit! Yep, that linen/phenolic stuff kinda reminds me of them old brown coffee cups, glasses, bowls and trays in the army chow halls back in the day ...could be the reason is that it is the same stuff, huh?[] Quote Link to comment Share on other sites More sharing options...
Marvel Posted January 3, 2009 Share Posted January 3, 2009 I owned a National Steel resonator guitar that had a phenolic neck. It finally did warp some, but I don't really fault the phenolic. Quote Link to comment Share on other sites More sharing options...
John Warren Posted January 3, 2009 Share Posted January 3, 2009 You're too damned serious about things, John, loosen up a bit! Fair enough. I'll bet that what you saw was, in fact, phenolic. The stuff really was everywhere up until the late 80s. Strong, machinable, moldable, great electrical insulator and comes in rod, bar, plate and billet. They're real old school materials. Quote Link to comment Share on other sites More sharing options...
Tarheel Posted January 3, 2009 Share Posted January 3, 2009 After 4 rounds we go to the judges score cards. Judge 1 has it scored 30-27 Warren Judge 2 has it scored 29-28 Richards Judge 3 has it scored 30-27 for the winner and still best cabinet material.......paper mache! Quote Link to comment Share on other sites More sharing options...
bluesboy Posted January 3, 2009 Share Posted January 3, 2009 After 4 rounds we go to the judges score cards. Judge 1 has it scored 30-27 Warren Judge 2 has it scored 29-28 Richards Judge 3 has it scored 30-27 for the winner and still best cabinet material.......paper mache! After 4 rounds we go to the judges score cards. Judge 1 has it scored 30-27 Warren Judge 2 has it scored 29-28 Richards Judge 3 has it scored 30-27 for the winner and still best cabinet material.......paper mache! Score it another killed thread by Tarheel. Quote Link to comment Share on other sites More sharing options...
Tarheel Posted January 3, 2009 Share Posted January 3, 2009 Hey bluesboy.....double quotes won't increase your post count[] Come on back guys.....I won't keep score any more[] Quote Link to comment Share on other sites More sharing options...
greg928gts Posted January 3, 2009 Share Posted January 3, 2009 ...and that hand selection part is turning into a real PIA. That's the key to a nice sheet for sure. The lumber section store reps now won't let you move the bad sheets off the top, citing "liability" and "danger to the customer"; and they don't want to move the sheets themselves, one even citing that there is no difference, and another telling me that "store policy" is that I have to take the top sheet.... A brief meeting with the store's "chain of command" with the manager telling them, "he comes here once every couple weeks and buys this stuff, so give the guy the sheet he wants" Whatcha do is pull off the top few sheets and put them on a cart and wheel the cart to the back of the store. Then get a new cart and go buy the new top sheet. Greg Quote Link to comment Share on other sites More sharing options...
michael hurd Posted January 4, 2009 Share Posted January 4, 2009 Whatcha do is pull off the top few sheets and put them on a cart and wheel the cart to the back of the store. Then get a new cart and go buy the new top sheet. Greg [Y][Y][Y] That's a great one there... have to remember that! Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted January 4, 2009 Share Posted January 4, 2009 Whatcha do is pull off the top few sheets and put them on a cart and wheel the cart to the back of the store. Then get a new cart and go buy the new top sheet. Greg That's a great one there... have to remember that! That's hilarious!!!! With my luck though.... they'd catch me and make me put the other sheets back!!!..... LOLOL!!! Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted January 4, 2009 Share Posted January 4, 2009 http://www.momastore.org/museum/moma/ProductDisplay_Cardboard%20Speakers_10451_10001_16442_-1_11548_11552_null_shop_ Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted January 4, 2009 Share Posted January 4, 2009 There was a company I think was called Amanita in the 70's. The cited a 'working wall' enclosure that was some type of molded resin compound that looked something like milk crate turned loudspeaker. Quote Link to comment Share on other sites More sharing options...
Batmans Robin Posted January 4, 2009 Author Share Posted January 4, 2009 Groomlakearea51, You are da man!!!!! That post of yours on page one is the real shit! Quote Link to comment Share on other sites More sharing options...
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