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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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substitute for plywood needed
On Mar 13, 9:27 am, Randy wrote:
Any plastic guru's here? Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. Problem with the plywood is it compresses in use, and as it gets thinner the bolts used to hold the whole thing together start to stick out and the unit requires frequent retorquing. Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum. Gargolite G7 looked nice until I saw the price of a 2 x 3 foot peice at $1140.00. I would need 2 x 4 or 5 foot peices. Any suggestions. Thank You, Randy Remove 333 from email address to reply. Randy, Garolite G11 at $550 from Mcmaster, per sheet. Aluminum tooling plate, 2' x 6' $750 same source. Dave |
#2
Posted to rec.crafts.metalworking
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substitute for plywood needed
On Mar 13, 10:27 am, Randy wrote:
Any plastic guru's here? Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. Problem with the plywood is it compresses in use, and as it gets thinner the bolts used to hold the whole thing together start to stick out and the unit requires frequent retorquing. Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum. Gargolite G7 looked nice until I saw the price of a 2 x 3 foot peice at $1140.00. I would need 2 x 4 or 5 foot peices. Any suggestions. Thank You, Randy Remove 333 from email address to reply. Welcome to the real world of manufacturing! Paul |
#3
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substitute for plywood needed
Randy wrote: Any plastic guru's here? Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. Problem with the plywood is it compresses in use, and as it gets thinner the bolts used to hold the whole thing together start to stick out and the unit requires frequent retorquing. Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum. Gargolite G7 looked nice until I saw the price of a 2 x 3 foot peice at $1140.00. I would need 2 x 4 or 5 foot peices. Any suggestions. Thank You, Randy Remove 333 from email address to reply. Possibly something he http://www.sdplastics.com/phenolic.html |
#4
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substitute for plywood needed
Any plastic guru's here?
Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. Problem with the plywood is it compresses in use, and as it gets thinner the bolts used to hold the whole thing together start to stick out and the unit requires frequent retorquing. Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum. Gargolite G7 looked nice until I saw the price of a 2 x 3 foot peice at $1140.00. I would need 2 x 4 or 5 foot peices. Any suggestions. Thank You, Randy Remove 333 from email address to reply. |
#5
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substitute for plywood needed
"Mechanical Magic" wrote in message ... On Mar 13, 9:27 am, Randy wrote: Any plastic guru's here? Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. Problem with the plywood is it compresses in use, and as it gets thinner the bolts used to hold the whole thing together start to stick out and the unit requires frequent retorquing. Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum. Gargolite G7 looked nice until I saw the price of a 2 x 3 foot peice at $1140.00. I would need 2 x 4 or 5 foot peices. Any suggestions. Thank You, Randy Remove 333 from email address to reply. Randy, Garolite G11 at $550 from Mcmaster, per sheet. Aluminum tooling plate, 2' x 6' $750 same source. Dave can you wrap the wood in high temp epoxy/fiberglass? |
#6
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substitute for plywood needed
On Mar 13, 9:27 am, Randy wrote:
.... Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum.... Particle board? |
#7
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substitute for plywood needed
On Mar 13, 1:25 pm, Jim Wilkins wrote:
On Mar 13, 9:27 am, Randy wrote: ... Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum.... Particle board? Buy the aluminum plate... It's almost like money in the bank! Wolfgang |
#8
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substitute for plywood needed
Contact the tech support for companies like
3M and Dow Corning. They might have a product that they can suggest. If you are just looking for the insulation effect how about using 1/8" or so backed up with a sheet of al. DOC On Mar 13, 12:27*pm, Randy wrote: Any plastic guru's here? Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. *Problem with the plywood is it compresses in use, and as it gets thinner the bolts used to hold the whole thing together start to stick out and the unit requires frequent retorquing. Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum. Gargolite G7 looked nice until I saw the price of a 2 x 3 foot peice at $1140.00. I would need 2 x 4 or 5 foot peices. Any suggestions. Thank You, Randy Remove 333 from email address to reply. |
#9
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substitute for plywood needed
Randy wrote:
Any plastic guru's here? Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. Nomex honeycomb aluminum faced panels. http://www.cattcousa.com/indust_com.htm Kevin Gallimore ----== Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.pronews.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= - Total Privacy via Encryption =--- |
#10
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substitute for plywood needed
On Mar 13, 11:27*am, Randy wrote:
Any plastic guru's here? Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. *Problem with the plywood is it compresses in use, and as it gets thinner the bolts used to hold the whole thing together start to stick out and the unit requires frequent retorquing. Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum. Gargolite G7 looked nice until I saw the price of a 2 x 3 foot peice at $1140.00. I would need 2 x 4 or 5 foot peices. Any suggestions. Thank You, Randy Remove 333 from email address to reply. Was the plywood you were using just regular fir or hardwood stuff? They do make a phenolic-clad Baltic birch plyboard for steel-rule press work. This stuff is about as stout a stuff as you can get in a wood product, it's used in a hydraulic press with a urethane die blanket opposing it for sheetmetal forming. Not sure how it would stand up to heat, though. Expensive stuff, too, last chunk I bought was 2x3 and ran about $40. You aren't going to get it from the local Lowe's or Home Despot, either. Strictly an industrial material, may take a little searching in your area to find it, called die-board around here. Cheaper than your Gargolite, though. Stan |
#12
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substitute for plywood needed
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#13
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substitute for plywood needed
Randy wrote: Where would one look to buy die-board? It is used by companies who make cardboard boxes. There should be someone in your area in that business who can point you to a local supplier. They may even sell you some, since they usually buy it by the pallet. -- aioe.org is home to cowards and terrorists Add this line to your news proxy nfilter.dat file * drop Path:*aioe.org!not-for-mail to drop all aioe.org traffic. http://improve-usenet.org/index.html |
#14
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substitute for plywood needed
On Fri, 14 Mar 2008 08:34:35 -0500, Randy wrote:
On Thu, 13 Mar 2008 21:56:41 -0700 (PDT), stans4... wrote: On Mar 13, 11:27Â*am, Randy wrote: Looking to replace a peice of 3/4" plywood with some type of plastic. Application is in a heated press used to join rubber sheets. Â*Problem with the plywood is it compresses in use, and as it gets thinner the bolts used to hold the whole thing together start to stick out and the unit requires frequent retorquing. Need some type of plastic that does not compress like wood, can withstand 350 deg F for 1 hour, and idealy would have a coeffient of expansion close to aluminum. .... The material has to be a thermal insulator as this sheet goes between the heater plate and another sheet of alum., and somewhere in there is an airbag to provide the force and some alum I-beams and tie bolts to clamp the whole thing together. The airbags need the wood sheet to limit the amount of heat they see. I'll need to research the thermal conductivity of wood VS particle board VS Al honeycomb. Wafer wood or particle board are pre compressed in their manufacture so that might be better, or the die-board or some other premium plywood might be better. .... Have you already tried cement fiber board, like Durock, WonderBoard, and HardieBacker, or ceramic boards Fibrefrax and Micore? Re insulation value, http://www.chimneysweeponline.com/horvalue.htm lists Durock at .4 R-value per inch and the ceramics at 2.2. Cement fiber board is low-cost (ca. $10 for a 3'x5'x.5" sheet) and uncompressable until it breaks; the ceramics I'm not familiar with, but think they might be 5x as much, and may compress easily. -jiw |
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