alsfarms Posted November 5, 2017 Share Posted November 5, 2017 I am wondering what type of material would work good to recast a radiator cap in a composition that is similar to bakelite. Al 1 Link to comment Share on other sites More sharing options...
cahartley Posted November 5, 2017 Share Posted November 5, 2017 Anything there that you like? >>> https://www.sumibe.co.jp/english/product/hpp/phenolic/shell-mold/index.html 1 Link to comment Share on other sites More sharing options...
alsfarms Posted November 6, 2017 Author Share Posted November 6, 2017 The above reference is certainly specialized material that should fit the bill for my project. Later this winter, with some time, I will see what I can work out. Al Link to comment Share on other sites More sharing options...
trimacar Posted November 6, 2017 Share Posted November 6, 2017 I'd also be tempted to try to cast it in Kwik Poly, dries hard as a rock, is whitish in color but could be painted. I know someone who uses it quite a bit for interior knobs and various other small pieces... 1 Link to comment Share on other sites More sharing options...
alsfarms Posted November 6, 2017 Author Share Posted November 6, 2017 David, Do you know if the quick poly has much heat and UV resistance? Alan Link to comment Share on other sites More sharing options...
trimacar Posted November 6, 2017 Share Posted November 6, 2017 Nothing on the Kwik Poly website talks about UV or heat resistance. It does mention you can add colored powder to make it any color you want. I'd be willing to bet that it would stand up to steam temperature. It sets up in minutes and gets very hard. You can order it directly from the manufacturer. No, I don't own stock in the company, you call them, they send it along with a bill, at least that's how I bought my last kit, it's just a great product for stabilizing weak wood, and as mentioned, it's very thin when first mixed so makes pouring into a mold very easy.... http://www.kwikpolyllc.com/ 1 Link to comment Share on other sites More sharing options...
alsfarms Posted November 6, 2017 Author Share Posted November 6, 2017 hmmmmmmm........ Link to comment Share on other sites More sharing options...
jan arnett (2) Posted November 6, 2017 Share Posted November 6, 2017 I used it for a shift knob and the only problem I encountered is it is very thin and runs every where the mold must but very tight. 1 Link to comment Share on other sites More sharing options...
Friartuck Posted November 7, 2017 Share Posted November 7, 2017 (edited) Kwik Poly can be tinted with powder pigment to achieve a certain color. Better than painting it afterwards. Yes KP has a thin viscosity when first mixed, but that is its advantage, to impregnate into porous material like wood. http://www.secondchancegarage.com/public4/kwikpoly-1.cfm Also consider the urethane products from Smooth On Plastics: https://www.smooth-on.com/ Edited November 7, 2017 by Friartuck (see edit history) 1 Link to comment Share on other sites More sharing options...
37_Roadmaster_C Posted November 7, 2017 Share Posted November 7, 2017 Also keep in mind that if you are casting a distributor cap you must have a material that will not breakdown under high voltage stresses. This rules out anything that has any conductive materials IE: graphite, carbon and any matelic fillers. It also has to be impervious to moisture absorbsion for the same reasions. If it ever starts to arc out you are done as it will burn a carbon trail that cannot be repaired. 1 Link to comment Share on other sites More sharing options...
sligermachine Posted November 7, 2017 Share Posted November 7, 2017 how a bought just machine the threads in to a brass cap and cover it in any type of delren 1 Link to comment Share on other sites More sharing options...
sligermachine Posted November 7, 2017 Share Posted November 7, 2017 i like to use play dough from the toy isal as a mold done it lots of times per year lots i fill it with 5 min expoy to make my part normally to test thread pich or polish gears i just made 1 Link to comment Share on other sites More sharing options...
alsfarms Posted November 7, 2017 Author Share Posted November 7, 2017 Thanks for the comments on delrin. If I could use basic shapes that would be OK but I need to transfer an emblem and script to delrin for this application won't work. Tomake a cap for a Dodge, that,s another story. I do like you idea of making a blank from which I can test threads during the machining process. I have used wire gauges in the past and they worked very nice but what a pain in the rear end to use. Al Link to comment Share on other sites More sharing options...
alsfarms Posted November 7, 2017 Author Share Posted November 7, 2017 37 Roadmaster, You gave me a very good idea! I need to locate or purchase some early Delco distributor lead nuts, for a project. I think I will do some leg work, to make sure of the electrical capabilities of the material, then make a pattern and build my cast my own lead nuts. I am sure I could get the proper brown color. I have a good original nut that I could use as a pattern. I want to build a radiator cap and now I am off talking about lead nuts. I may in the cast up a pair of 4 cylinder dual spark distributor caps....in the future. Thanks for the thoughts and observations. Al Link to comment Share on other sites More sharing options...
sligermachine Posted November 8, 2017 Share Posted November 8, 2017 13 hours ago, alsfarms said: Thanks for the comments on delrin. If I could use basic shapes that would be OK but I need to transfer an emblem and script to delrin for this application won't work. Tomake a cap for a Dodge, that,s another story. I do like you idea of making a blank from which I can test threads during the machining process. I have used wire gauges in the past and they worked very nice but what a pain in the rear end to use. Al i have never used wire gauges but im self tough machinist i just kept making all my own test parts i love to cast teast parts out of 5 min. epoxy . i need a radator cap for my 1929 doge to jess if u find one we could just make a sand pack mold and pore some at my house kyle Link to comment Share on other sites More sharing options...
lozrocks Posted November 8, 2017 Share Posted November 8, 2017 (edited) Silicone. Hands down the best finish. You should be able to pick up a silicone mold kit from an art supply store. Plenty of youtube clips to show you how. 2 part silicone is easier to use. Edited November 8, 2017 by lozrocks spelling mistake (see edit history) Link to comment Share on other sites More sharing options...
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