diesel1 Posted November 26, 2020 Share Posted November 26, 2020 The other day I made 2 fv430 track pad moulds out of steel, after researching the correct type of polymer rubber to use with a shore hardness of A95, I purchased some. I used an old backing plate with the rubber removed, sand blasted the backing plate to remove all the rust, bolted it in the mould, and poured in the polymer mix. Didn't add any black colouring, as this is just a prototype pad. I put the moulds in a sealed tin and put on top of the radiators for 24 hrs, they were at a constant temperature of 35 c. Thismorning I pressed the pad out of the mould, I was impressed how well it looked, seems identical to a new pad in looks and hardness. Im going to make 5 half worn pads and put them on the abbot to see how well they do. It was all very easy really. Andrew IMG_0898.HEIC Quote Link to comment Share on other sites More sharing options...
diesel1 Posted November 26, 2020 Author Share Posted November 26, 2020 (edited) 25 minutes ago, diesel1 said: The other day I made 2 fv430 track pad moulds out of steel, after researching the correct type of polymer rubber to use with a shore hardness of A95, I purchased some. I used an old backing plate with the rubber removed, sand blasted the backing plate to remove all the rust, bolted it in the mould, and poured in the polymer mix. Didn't add any black colouring, as this is just a prototype pad. I put the moulds in a sealed tin and put on top of the radiators for 24 hrs, they were at a constant temperature of 35 c. Thismorning I pressed the pad out of the mould, I was impressed how well it looked, seems identical to a new pad in looks and hardness. Im going to make 5 half worn pads and put them on the abbot to see how well they do. It was all very easy really. Andrew IMG_0898.HEIC 628.04 kB · 6 downloads Would look a lot better with the black pigment in it. Edited November 26, 2020 by diesel1 More txt needed Quote Link to comment Share on other sites More sharing options...
Chris Hall Posted November 28, 2020 Share Posted November 28, 2020 Looks a good job!! Quote Link to comment Share on other sites More sharing options...
SirLanceUK Posted December 1, 2020 Share Posted December 1, 2020 Hi Andrew, How did you get on with the half worn pads? I was wondering if you would provide a little more information on the polymer rubber (supplier, storage, mixing and curing instructions. As you know there is a universal track issue with CVRT's and I was wondering if this was something that could be adapted and applied to CVRT tracks. Just a thought while I have some time and if you don’t mind sharing of course Quote Link to comment Share on other sites More sharing options...
diesel1 Posted December 1, 2020 Author Share Posted December 1, 2020 (edited) I've only done full pads at the moment, I did do a test piece by pouring some polymer into a mould sat on top of a old pad that had been cleaned up. It didn't seem to have much hold after it had set. If recapping pads, the old pad needs to be cleaned up really well, then a special primer needs to be applied to the surface before pouring the polymer. I've got some on order from the USA,, cannot find anything similar in this country but I'm sure there will be somewhere. I need to recap some pads and test them properly before making too many and finding there no good. Making a new pad is a lot better, but a recapped pad is a lot cheaper to make. Im using a PMC-790 industrial liquid rubber compound . Spray a wax based release agent in the mould and leave to dry, mix the part a and part b polymers together making sure they are above 23c, also the mould needs to be warm, once poured the polymer will start to set within 5 mins. I have a hot box for food, bought off eBay for £40, can be kept at a constant 50c for 24 hrs, will hold about 12 mounds. Will post pics of the mounds tomorrow, easy to make, made another 2 in about 30mins the other day, I now have 10. Cvrt pads will be very difficult to do, I've some need doing but will give it a miss! Edited December 11, 2020 by diesel1 Quote Link to comment Share on other sites More sharing options...
sirhc Posted December 1, 2020 Share Posted December 1, 2020 To do the CVRT track you’d need to remove all the rubber from the link and remould it. You’d probably also need to replace the bushes. If the link is worn and the metal is thin then it’s scrap anyway. Quote Link to comment Share on other sites More sharing options...
SirLanceUK Posted December 2, 2020 Share Posted December 2, 2020 Doesn't sound like it's a goer, but if i can source bushes and they are not the price of gold I haven't even looked at removing the rubber from the existing track, before a got a scrap track(s) to experiment on I thought I would ask a few questions. Like can I get the bushes A thought just occured to me if you drilled a series of holes at angles into the existing rubber and then pored the rubber into the holes and on to make the "recap" if that would be strong enough rather than just "recapping" the pad... Another question I will have to look into Quote Link to comment Share on other sites More sharing options...
teletech Posted December 12, 2020 Share Posted December 12, 2020 On 12/2/2020 at 2:20 AM, SirLanceUK said: Doesn't sound like it's a goer, but if i can source bushes and they are not the price of gold I haven't even looked at removing the rubber from the existing track, before a got a scrap track(s) to experiment on I thought I would ask a few questions. Like can I get the bushes A thought just occured to me if you drilled a series of holes at angles into the existing rubber and then pored the rubber into the holes and on to make the "recap" if that would be strong enough rather than just "recapping" the pad... Another question I will have to look into I noticed a fellow over on the FV430 forum who was drilling some holes for grip and "recapping" his pads with good results. I imagine the same could be done for the CVR(T). Indeed, it could be the bushes are shot which would make it not worth doing for now. Quote Link to comment Share on other sites More sharing options...
diesel1 Posted December 12, 2020 Author Share Posted December 12, 2020 1 hour ago, teletech said: It's the bonding primer that's hard to get, without it it won't work, polymer won't bond to rubber well enough without the primer, I've tried it. A company in U.K. can supply me with the primer but it's £250 for just under a litre, they get it from the states, I've ordered some from the states and it's a lot cheap than that but still expensive. Plus, when the primer comes and say it doesn't work as well as it should then it's been a expensive lesson. Quote Link to comment Share on other sites More sharing options...
SirLanceUK Posted December 12, 2020 Share Posted December 12, 2020 I dont know if I put this elsewhere or just kept it to myself but I did contact Cook Defense and got this back A set of CVR(T) track is currently circa £26,000 ex vat at this time depending on the exact quantity of links required. ummm not sure I will be rushing to get some. Lance Quote Link to comment Share on other sites More sharing options...
terryb Posted December 12, 2020 Share Posted December 12, 2020 I think if I paid £31200 on some new rubber for my motor and it only lasted 1300 miles I'd be straight round Kwik Fit for a refund... Quote Link to comment Share on other sites More sharing options...
Terra1936 Posted February 17, 2021 Share Posted February 17, 2021 Did a solution ever work out? Quote Link to comment Share on other sites More sharing options...
diesel1 Posted February 17, 2021 Author Share Posted February 17, 2021 Yes, I have recapped about 30 track sections, so it can be done, will be doing a lot more this spring when my workload slows down and the days are longer Quote Link to comment Share on other sites More sharing options...
diesel1 Posted February 17, 2021 Author Share Posted February 17, 2021 Quote Link to comment Share on other sites More sharing options...
Terra1936 Posted February 17, 2021 Share Posted February 17, 2021 Look great! How do you think they will hold up? Quote Link to comment Share on other sites More sharing options...
diesel1 Posted February 17, 2021 Author Share Posted February 17, 2021 Im sure they will hold up ok, when I get time I will be put a section of 15 on the sabre and abuse them as much as possible on the concrete, I have some abrasive concrete in my yard, if they survive that they should survive anything ! Quote Link to comment Share on other sites More sharing options...
SirLanceUK Posted February 17, 2021 Share Posted February 17, 2021 They are looking good, when are you going to try them? Cant wait to bring some up for you to do and kick some tracks Lance Quote Link to comment Share on other sites More sharing options...
johann morris Posted February 17, 2021 Share Posted February 17, 2021 Nice job, from my experience with my Panzer wheels, vasaline is a far better release agent than silicon sprays. Jon Quote Link to comment Share on other sites More sharing options...
diesel1 Posted February 17, 2021 Author Share Posted February 17, 2021 1 hour ago, johann morris said: Nice job, from my experience with my Panzer wheels, vasaline is a far better release agent than silicon sprays. Jon Thanks, release agent was rubbish, I now use grease or gear oil, works a treat. new pads have about 8-9mm of rubber on at there lowest point, does not seem much, I'm making them with 12-13mm, also will be testing some with 15-16mm Quote Link to comment Share on other sites More sharing options...
andym Posted February 17, 2021 Share Posted February 17, 2021 On 12/12/2020 at 1:01 PM, terryb said: I think if I paid £31200 on some new rubber for my motor and it only lasted 1300 miles I'd be straight round Kwik Fit for a refund... Actually Terry, I think you did if you're a UK taxpayer! Andy Quote Link to comment Share on other sites More sharing options...
sirhc Posted February 17, 2021 Share Posted February 17, 2021 2 hours ago, diesel1 said: Thanks, release agent was rubbish, I now use grease or gear oil, works a treat. new pads have about 8-9mm of rubber on at there lowest point, does not seem much, I'm making them with 12-13mm, also will be testing some with 15-16mm I would be very careful with increasing the height of the track pads, they may last longer but the tracks do bounce a lot when running and you could create issues. Quote Link to comment Share on other sites More sharing options...
Terra1936 Posted February 17, 2021 Share Posted February 17, 2021 I hope you video or document the step by step process for all of us that are lazy and waiting for you to do the hard work. Quote Link to comment Share on other sites More sharing options...
SirLanceUK Posted April 9, 2021 Share Posted April 9, 2021 Been a couple of months on, any news? not that I am about to need several as I am about to do lots of road work 😄 Quote Link to comment Share on other sites More sharing options...
diesel1 Posted April 10, 2021 Author Share Posted April 10, 2021 I've made myself a full set, they are doing ok. Time consuming job. Quote Link to comment Share on other sites More sharing options...
Terra1936 Posted April 10, 2021 Share Posted April 10, 2021 1 hour ago, diesel1 said: I've made myself a full set, they are doing ok. Time consuming job. Any tips or instructions for the rest of us? Photos? Formulas? Can you play at our house? Quote Link to comment Share on other sites More sharing options...
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