rbrown7713 Posted October 11, 2020 Author Share Posted October 11, 2020 This is an example of a poorly designed mold. I focused on designing it to make sure that the mold came apart and neglected to visualize the difference of heights of the mold, therefore I am suspecting that part of the plastic will run out and cause a void. I tried to stop the leakage by enclosing it in the original plastic box in hopes that the plastic is forced up into the void. This might be a lesson on how not to design a mold. After the part comes out, I will show you what I mean, and I will possibly have to make a correct mold. This is a mold for the fuel tank to the E8. Now this will be really interesting to see how it comes out. Bob. Quote Link to comment Share on other sites More sharing options...
Chuck Posted October 11, 2020 Share Posted October 11, 2020 Interesting! I do like the pilot you're casting! And the straw "sprues" remind me of watching old metal foundry casting videos. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 11, 2020 Author Share Posted October 11, 2020 Here are the results of the the castings and they all turned out well including the poorly designed fuel tank. Yes, the only missing part, in a properly poured mold, is a sprue to pour the plastic, and on some molds that I make, I also use that method, this uses the squish method. Bob. Quote Link to comment Share on other sites More sharing options...
Sean Posted October 12, 2020 Share Posted October 12, 2020 Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 12, 2020 Author Share Posted October 12, 2020 Thanks Sean. I poured these parts before I needed them, just to prove that these molds are viable and would produce good parts as they did. I still have a few more molds to make. Thanks for the thumbs up. Bob. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 13, 2020 Author Share Posted October 13, 2020 Here is the freight type pilot clayed up for pouring the first part of the mold. Bob. Quote Link to comment Share on other sites More sharing options...
Chuck Posted October 13, 2020 Share Posted October 13, 2020 Yes...all looking very good! Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 13, 2020 Author Share Posted October 13, 2020 Thanks Chuck, and I am how waiting for 18 more lbs. of silicone. I just went through 18lbs. of silicone and only finished half of the molds. I am now back on the Superliner cars' trucks and people installation for a few days. Bob. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 14, 2020 Author Share Posted October 14, 2020 Here is a little historical information having to do with the design of the Garich E-8. The company, Garich Light Transport hired A&W Model Craft of so. Ca. to make the patterns and molds for the Garich E-8 and I was told that Lloyd Asbury of A&W MODEL CRAFT, used the Union Pacific E8--942 at the Southern California Railway Museum for the basis of making the pattern for the 1:32 model E8. In my estimation, he did an excellent job, here is a picture of 942. After reviewing the picture, I realized that Lloyd added skirts to the model, not shown on the prototype. Bob. Quote Link to comment Share on other sites More sharing options...
Chuck Posted October 14, 2020 Share Posted October 14, 2020 Great info Bob as these Garich E8's deserve to have their story told!! Here's some interesting info I found about the UP's E Units... " May 1950 UP received the first of 46 E8 locomotives (18 cab units and 28 cabless booster units) from EMD. (Deliveries continued through 1953)" And.... "September 7, 1969The City of Los Angeles, City of San Francisco, City of Portland, City of Denver, and City of Kansas City (ex-City of St. Louis) were all combined into a single train, known by railfans as the "City of Everywhere." Between Cheyenne and Green River, the City of Everywhere ran as a fully combined train. At times the train could reach as many as 27 cars and six E-units in an A-B-B-B-B-A locomotive consist unmatched by any other railroad." Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 14, 2020 Author Share Posted October 14, 2020 Great info. I can see it now an ABBBBA on my layout, oh boy. I mentioned it before, but Lloyd Asbury, the guy responsible for the pattern and the mold, is the same guy that modeled many Hot Wheel cars and slot cars, and a bunch of other stuff that I can't yet verify as he disappeared to Mexico, unexpectedly? Don't know what that was about, but this was told by his son. It can be googled, he tells the story on some forum, pretty interesting. I am getting ready to pour my first shell and I am trying to figure out what the best plastic to use. Bob. Quote Link to comment Share on other sites More sharing options...
Sean Posted October 14, 2020 Share Posted October 14, 2020 The same stuff that LGB uses ..tough Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 15, 2020 Author Share Posted October 15, 2020 Unfortunately LGB doesn't use pour type plastic, they are injected molded. Bob. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 15, 2020 Author Share Posted October 15, 2020 I came right back to the plastic that I have been using all of the time. It is from BITY molds, number 1512. It gives me 20 minutes of pot life, that's 20 min. for mixing and pouring. Sounds like a lot of time, but in this time it keeps getting thicker, so one has to be quick. It cures in 16 hrs. I will be pouring a shell tomorrow morning and hope that it comes out okay. I will post a picture. Bob. Quote Link to comment Share on other sites More sharing options...
Sean Posted October 15, 2020 Share Posted October 15, 2020 Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 16, 2020 Author Share Posted October 16, 2020 Ready to pour. Sorry, my house cleaner refused to come over until I clean up first. Bob. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 16, 2020 Author Share Posted October 16, 2020 Disaster struck. My funnel came out in the middle of the pour, but I had enough plastic to continue. All of the chimneys were full of plastic, so that means that the mold filled completely and should produce a good product. Bob. Quote Link to comment Share on other sites More sharing options...
Jerry B44 Posted October 16, 2020 Share Posted October 16, 2020 Glad it worked out, be fun to see. You sure do big parts/molds! Quote Link to comment Share on other sites More sharing options...
Chuck Posted October 16, 2020 Share Posted October 16, 2020 Gonna be interesting and hopefully all comes out well! Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 16, 2020 Author Share Posted October 16, 2020 Thanks guys, I might make an E8-B mold, that way, I won't have to pour 2 A units to make one B, but that would be a big job, I haven't decided yet. I am demolding this shell Sunday, Bob. Quote Link to comment Share on other sites More sharing options...
Sean Posted October 16, 2020 Share Posted October 16, 2020 You house cleaner is going to be pi**ed ... Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 16, 2020 Author Share Posted October 16, 2020 I couldn't wait until tomorrow, so here it is, darned near perfect. Bob. Quote Link to comment Share on other sites More sharing options...
Chuck Posted October 16, 2020 Share Posted October 16, 2020 Congratulations! Must be first time in like 25 years that mold has been used??!! Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 17, 2020 Author Share Posted October 17, 2020 Yes, I think you are pretty close with the timeline. I got scared for a time trying to remove the shell, as it was tight. I finally figured out how to get it out, whew. I know now why maybe the previous mold was torn, it was that tight. Now I have to pour another. Bob. Quote Link to comment Share on other sites More sharing options...
Chuck Posted October 17, 2020 Share Posted October 17, 2020 For the age I was going by this page that was posted elsewhere on this website Quote Link to comment Share on other sites More sharing options...
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