Alex Lowe Posted July 15, 2021 Report Share Posted July 15, 2021 Hi all Would anyone have a source for some Teflon spring buttons for rebuilding the rear spring on a GT6 as iv heard the new rubber ones absolutely do not last. Link to comment Share on other sites More sharing options...
rlubikey Posted July 16, 2021 Report Share Posted July 16, 2021 Alex, I had a friend machine mine. And apparently PTFE isn't the best material for this application, but oil-impregnated nylon. I'm afraid I've forgotten the trade name of the material, sorry. Cheers, Richard Link to comment Share on other sites More sharing options...
Badwolf Posted July 16, 2021 Report Share Posted July 16, 2021 I was recommended polybush buttons at the time my leaf spring was in bits but could never find any or anything similar. Link to comment Share on other sites More sharing options...
Alex Lowe Posted July 16, 2021 Author Report Share Posted July 16, 2021 I to thought poly bust buttons would be ideal but iv never been able to find any. Link to comment Share on other sites More sharing options...
ed.h Posted July 16, 2021 Report Share Posted July 16, 2021 I used Delrin (Acetal). It is almost as slippery as PTFE, but has much higher compressive strength. Ed Link to comment Share on other sites More sharing options...
DVD3500 Posted July 17, 2021 Report Share Posted July 17, 2021 Source? Link to comment Share on other sites More sharing options...
Alex Lowe Posted July 17, 2021 Author Report Share Posted July 17, 2021 20 hours ago, ed.h said: I used Delrin (Acetal). It is almost as slippery as PTFE, but has much higher compressive strength. Ed Now that would be brilliant Ed where do you get these from? Link to comment Share on other sites More sharing options...
SpitFire6 Posted July 17, 2021 Report Share Posted July 17, 2021 Find the diameter of rod required. Find a friendly machinist. Sell them.😀 Link to comment Share on other sites More sharing options...
SpitFire6 Posted July 17, 2021 Report Share Posted July 17, 2021 3D print them? Link to comment Share on other sites More sharing options...
ed.h Posted July 17, 2021 Report Share Posted July 17, 2021 3 hours ago, Alex Lowe said: Now that would be brilliant Ed where do you get these from? They were home made: http://bullfire.net/GT6/GT6-8/GT6-8.html Ed Link to comment Share on other sites More sharing options...
68vitesse Posted July 17, 2021 Report Share Posted July 17, 2021 Bought a wad punch and some polyurethane sheet of eBay to make some for my Vitesse spring, used an hydraulic bearing puller to drive the punch to cut them. Using my biggest lump hammer a waste of time. Regards Paul Link to comment Share on other sites More sharing options...
WWT338J Posted July 18, 2021 Report Share Posted July 18, 2021 I think I got mine from Holland. Try this link http://www.triumphspitfire.nl/rearspringpads.html David Link to comment Share on other sites More sharing options...
Alex Lowe Posted July 18, 2021 Author Report Share Posted July 18, 2021 Ah nice one are they happy to ship to the UK? Link to comment Share on other sites More sharing options...
Adrian Posted July 19, 2021 Report Share Posted July 19, 2021 I bought a teflon rod and used the Dutch site for dimentions, a friend knocked them up. Link to comment Share on other sites More sharing options...
DVD3500 Posted July 20, 2021 Report Share Posted July 20, 2021 9 hours ago, Adrian said: a friend knocked them up. The Dutch?! Link to comment Share on other sites More sharing options...
Adrian Posted July 20, 2021 Report Share Posted July 20, 2021 Alright Hollander! Some scenic Scandanavian flat place. Link to comment Share on other sites More sharing options...
ludwig113 Posted July 21, 2021 Report Share Posted July 21, 2021 On 18/07/2021 at 17:02, Alex Lowe said: Ah nice one are they happy to ship to the UK? yes they were, before brexit, no hassle. paul Link to comment Share on other sites More sharing options...
krissto2015 Posted July 22, 2021 Report Share Posted July 22, 2021 https://www.ebay.co.uk/itm/283872996707 Link to comment Share on other sites More sharing options...
Unkel Kunkel Posted July 22, 2021 Report Share Posted July 22, 2021 Teflon is better certainly than the original rubber but for wear resistance, ultra high molecular weight polyethylene (UHMWPE) is probably the first choice according to American and Dutch websites and is probably better than Acetal ( Or Delrin as it is known in the States) (As a complete aside, this mirrors orthopedic practice where Sir John Charnley’s first hip replacements using Teflon wore out after year or so but when he changed to UHMWPE they were very much more successful.This material, with slight changes, is still used for its wear resistance is various orthopaedic roles) It is cheap, comes in bar, white and waxey- looking .Resistant to pretty much anything( apart from heat) It is said to be “easily machinable” Not by me, - I had quite a little pile of failures along side the mini lathe, long stringy bits of white swarf, and all different thicknesses until I had a set that looked reasonable. (The width of the spring with a 2 mm or so “bump” to fit the recess. Haven’t tried them yet as body still off chassis. 1 Link to comment Share on other sites More sharing options...
ed.h Posted July 23, 2021 Report Share Posted July 23, 2021 This is a useful table for comparing plastics properties. Ignoring the engineering ("designer") plastics, and focusing on some of the more common plastics for this application, Delrin acetal is designated as POM H, Nylons as PA, UHMWPE as UMHW, Teflon as PTFE. The most important properties would be Compressive Strength (higher is better) and Coefficient of Friction (lower is better). For example, PTFE (Teflon) is very slippery, but also very weak in compression. The table doesn't seem to include fortified plastics, like Nylatron, which I believe is just a Nylon infused with Molybdenum disulfide to reduce friction, which would seem to make it a good candidate. https://precisionpunch.com/wp-content/pdf/PropertyComparisonChart.pdf Link to comment Share on other sites More sharing options...
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