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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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Way off topic - plastics help please...
I note there's a lot of general knowledge out there in this group and
I have hopes that someone is familiar with plastics to make some suggestions. I've cross posted to one other group. I'm not familiar with what all is available today in the plastic/ polymer field. What two plastics, choosing, say, PVC, Polyethylene, UHMW, ABS, and so on, are the slickest, or will wear well against ONE ANOTHER? I'm using a 2" UHMW piston in a PVC cylinder and the wear seems to be OK, but I really feel there's something better and probably "slicker" against one another out there than what I'm using now... Teflon is pretty prohibitive for cost, I do know that... Any ideas or experience out there? Thanks in advance... Bill |
#2
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Way off topic - plastics help please...
npwbill writes:
I'm using a 2" UHMW piston in a PVC cylinder and the wear seems to be OK, but I really feel there's something better and probably "slicker" against one another out there than what I'm using now UHMW-PE is self-lubricating but the PVC may have filler that is abrasive. Teflon is pretty prohibitive for cost, ... You can get bondable PTFE sheets to line things with for ultimate lubricity at low cost. |
#3
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Way off topic - plastics help please...
On Thu, 14 Feb 2008 00:59:26 -0600, Richard J Kinch wrote:
npwbill writes: I'm using a 2" UHMW piston in a PVC cylinder and the wear seems to be OK, but I really feel there's something better and probably "slicker" against one another out there than what I'm using now UHMW-PE is self-lubricating but the PVC may have filler that is abrasive. Teflon is pretty prohibitive for cost, ... You can get bondable PTFE sheets to line things with for ultimate lubricity at low cost. Small Parts, Inc. has PTFE o-rings. Dunno what your price point is between 'affordable' and 'prohibative', but a couple of them on a piston will be cheaper than a whole piston. -- Tim Wescott Control systems and communications consulting http://www.wescottdesign.com Need to learn how to apply control theory in your embedded system? "Applied Control Theory for Embedded Systems" by Tim Wescott Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html |
#4
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Way off topic - plastics help please...
On Wed, 13 Feb 2008 22:17:35 -0800 (PST), npwbill
wrote: I note there's a lot of general knowledge out there in this group and I have hopes that someone is familiar with plastics to make some suggestions. I've cross posted to one other group. I'm not familiar with what all is available today in the plastic/ polymer field. What two plastics, choosing, say, PVC, Polyethylene, UHMW, ABS, and so on, are the slickest, or will wear well against ONE ANOTHER? I'm using a 2" UHMW piston in a PVC cylinder and the wear seems to be OK, but I really feel there's something better and probably "slicker" against one another out there than what I'm using now... Teflon is pretty prohibitive for cost, I do know that... Any ideas or experience out there? Thanks in advance... Bill I think you'll have to experiment. Teflon may not be the answer. As an aside, I once visited K2 (ski maker) on Vashon Island near Seattle on business. I asked about Teflon for the running surface, and was told they had tried it, thought it would be great, but it didn't run nearly as well as UHMW. That was a beatiful facility, by the way. The VP of R&D we were visiting with was dressed in jeans, polo shirt, and sneakers, and had the help loading up the van for a run up the mountain for some field tests. What a gig. Pete Keillor |
#5
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Way off topic - plastics help please...
On Wed, 13 Feb 2008 22:17:35 -0800 (PST), npwbill
wrote: I note there's a lot of general knowledge out there in this group and I have hopes that someone is familiar with plastics to make some suggestions. I've cross posted to one other group. I'm not familiar with what all is available today in the plastic/ polymer field. What two plastics, choosing, say, PVC, Polyethylene, UHMW, ABS, and so on, are the slickest, or will wear well against ONE ANOTHER? I can't tell you what will be slickest or longest wearing, but a couple common combinations that work well are Delrin(acetal) on Nylatron(moly filled nylon) and Delrin/UHMW. Both Nylatron and UHMW are used for the slider beds and wear strips in conveying systems with Delrin chains. Rex Tabletop, Sideflex, and Multiflex are examples of this type of chain. It's been a long time since I've used any of these, but I'm pretty sure Rex has data in their literature. Here perhaps: http://www.delzer.com/v5fmsnet/LinkP...x/8rxEM-en.pdf -- Ned Simmons |
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