rbrown7713 Posted September 23, 2020 Author Share Posted September 23, 2020 Here is a picture of the mold. It appears to be perfect, no tears, no anomalies. It is designed, obviously by a professional to eliminate mold lock and should be easy to remove the shell after cure easily. Bob. Quote Link to comment Share on other sites More sharing options...
Sean Posted September 23, 2020 Share Posted September 23, 2020 Hmmmmm ...Your b unit mold will be interesting.. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted September 23, 2020 Author Share Posted September 23, 2020 I don't think that a B unit mold is necessary to make a B unit, do you? Quote Link to comment Share on other sites More sharing options...
Sean Posted September 23, 2020 Share Posted September 23, 2020 Are the b units longer ? What was your thinking .. Quote Link to comment Share on other sites More sharing options...
Chuck Posted September 23, 2020 Share Posted September 23, 2020 Nice Bob! Make a B unit out of 2 A's. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted September 23, 2020 Author Share Posted September 23, 2020 Thanks Chuck, the mold is nice. I need the front nose door for a mold, the two cab doors, the center doors, and the rectangular fan shrouds on the top, the pipes, all to make molds. How about lending me those for a passenger pilot, I will send them back when the molds are made and any parts that you need. The B units are the same length as the A's. The cab is cut right behind the door and then the rear of another A is cut off from the end and spliced. Voila, a B unit. Quote Link to comment Share on other sites More sharing options...
Sean Posted September 24, 2020 Share Posted September 24, 2020 Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted September 24, 2020 Author Share Posted September 24, 2020 Chuck, Plano got back to me and sent a PDF of what he has. His etcher only wants to go 8 inches on the grill, but I am asking for 9 inches as that number works out better. He will have to change the id of the shrouds because his id numbers are different. 48 inch fan shroud id is .505 he had a different number. and the 36" shroud is .432 he had .490, so if he excepts these new numbers I will order some. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted September 25, 2020 Author Share Posted September 25, 2020 Chuck, I put in my order to Plano. I told Kieth to let you use my art work. If you use Plano, I would check the measurements of the shrouds and the grills to make sure that they are the same as mine. There were two molds made for the E8 phase 1 and phase 2, so just check the measurements to make sure they are the same. Bob. Quote Link to comment Share on other sites More sharing options...
Chuck Posted September 25, 2020 Share Posted September 25, 2020 Thanks Bob! My bodies are phase 1 so maybe that explains the inner mold tear marks perhaps? I'm at least a few months away from working on my E units as have other projects to finish up first. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted September 25, 2020 Author Share Posted September 25, 2020 I checked out my E8 and it is a series 1 and the mold is a series 2, so the measurements should be correct, but it never hurts to check. I have also bought 3 E8 shells and a Ralph Brown E7B and some parts that is kind of mangled, but I think that I can fix it. As it turns out, the pilot that I got is a freight pilot, so I will have to create the cover to make a passenger pilot. It won't be too bad, I will have to re-create all of the doors, I have everything else. Bob. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted September 27, 2020 Author Share Posted September 27, 2020 Chuck, here is a picture of a sand fill hatch casting that I don't have. Do you have an extra one that I can borrow to make a mold, I will return it. Thanks. Quote Link to comment Share on other sites More sharing options...
Chuck Posted September 27, 2020 Share Posted September 27, 2020 Bob, Mine are different as they're just doors. After looking thru my Diesel Locomotives Cyclopedia it appears those are a road specific item perhaps? Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted September 27, 2020 Author Share Posted September 27, 2020 They would be fine if they are not easily removed or if you have extra ones. Bob. Quote Link to comment Share on other sites More sharing options...
Chuck Posted September 29, 2020 Share Posted September 29, 2020 I did manage to get one out of a shell if still needed will send tomorrow. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted September 29, 2020 Author Share Posted September 29, 2020 Chuck, I appreciate your trouble. I also got one out of my loco, so I won't be needing it, I am sorry. Bob. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 7, 2020 Author Share Posted October 7, 2020 I have to make molds for some missing parts to the Garich E-8, so I have decided to take some hints from the experts as to how to eliminate air bubbles from the part by using chimneys to allow the air to escape. Here is how you do it. Here is what it looks like after the pour. Bob. Quote Link to comment Share on other sites More sharing options...
Sean Posted October 7, 2020 Share Posted October 7, 2020 Interesting..I hope it works ! Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 7, 2020 Author Share Posted October 7, 2020 I can't think of any reason why excepted methods used for years won't work, do you? If you have some suggestions, let me know, Bob. Quote Link to comment Share on other sites More sharing options...
Sean Posted October 7, 2020 Share Posted October 7, 2020 I have no experience doing anything like this..Just very interesting for me , to see what you do and how great they come out. I'm just in awwwww Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 8, 2020 Author Share Posted October 8, 2020 Thanks Sean. Over the years, I have been lucky in producing parts that don't contain air bubbles, that's because the shape of the parts were flat, but when you have parts that have varying heights, then the chimneys are necessary to release the air in the mold. I have just started using this method because it was necessary to produce good parts and air free. I will be posting some finished parts in the future. Also, I have changed over to silicone molds instead of urethane, makes better molds, but at a cost. Here is the finished mold halves. Bob. Quote Link to comment Share on other sites More sharing options...
Chuck Posted October 10, 2020 Share Posted October 10, 2020 Be interesting to see how those parts turn out! Do you also de-gas the resin before pouring?? Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 10, 2020 Author Share Posted October 10, 2020 No, not necessary, as the plastic that I use is urethane and I have had no problems with air bubbles other than mistakes that I have made in joining the molds together. I will be pouring some soon. Bob. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 10, 2020 Author Share Posted October 10, 2020 Here is the pattern for one of the pilots ready for the first half of the mold. Bob. Quote Link to comment Share on other sites More sharing options...
rbrown7713 Posted October 11, 2020 Author Share Posted October 11, 2020 Here is what the pour looks like shortly after the pouring the plastic. The straws are inserted to keep from making more of a mess, and we will see how it comes out, Bob. Quote Link to comment Share on other sites More sharing options...
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