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Post by Excrewchief on Feb 26, 2017 19:56:50 GMT -7
Here is the first of some photos to help get you going and i'll post more as i go.  |
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Post by Excrewchief on Feb 26, 2017 19:58:27 GMT -7
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Post by Excrewchief on Feb 26, 2017 20:00:17 GMT -7
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Post by superstock on Feb 27, 2017 8:00:52 GMT -7
rocky...maybe this will generate some new people an some talk on the board..now for the questions?? what name brand of clay do you use?? what tools do you use to smooth out the window areas?? do you heat the clay before use?? if so how?? told you I will have a lot of questions... superstock
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Post by Excrewchief on Feb 27, 2017 16:19:40 GMT -7
Ask all you want that is why i started it. Everyone has there own way and products that they like but like yourself when i started i could not find anything . Myself i started using alumilite products at the time it was all i could find . And to this day i still like it . But we use smooth on now . They are both very good . After you learn how to use it . My self i had a hard time making the switch greg had been using smooth on for a long time and working with him it was easyer to just use what he was so that everything matched. The product change was no big deal the issue for me was the timing and with the resin i had more time to do what i needed mixing pooring etc with the alumilite or at least it seamed that way. To tell you the truth it was different by maybe a few seconds but that seems like minutes when you are learning a new product. The main reason for us to use the smooth on is we have a local warehouse it that makes it easy when you need things quick. As far as clay we both use the alumilite clay and really have not found anything else even close it is easy to use it stays pliable most of my clay is a couple years old and gregs is alot older i think i keep mine in a zip lock bag but have left it out a week or two with no problems. Greg keeps his in a cardboard box it is harder he microwaves it before using it he has no problem when i use he i dont like as much as mine . But it does work fine it is harder on my hands but i have a lot of artists so i notice it more than most people. And for tools i have a cheep set of clay tools that i use a little mostly i use popcycle sticks i have one i cut on a 45 at the end i can scrape and use the point for the corners etc.take your time the one im doing now i'v been working on for two days .others i can knock out in a couple hours . Be careful not to pack it so tight as to deform the body or ? Its easy to pack it so full the body bows out i keep pushing down or in on the body hood trunk to keep it from bowing out. I forgot if you had other questions ill go back and look if there is some more i'll come back and add i should have some more pictures later today . Thanks for the questions and ask all that you want and i will do my best i should have more time to spend on here now so spread the word keep asking and i will do my best. It i dont you are welcome to let me know thanks Rocky.
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Post by Excrewchief on Feb 27, 2017 16:45:24 GMT -7
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Post by Excrewchief on Feb 27, 2017 16:46:21 GMT -7
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Post by Excrewchief on Feb 27, 2017 16:47:03 GMT -7
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Post by Excrewchief on Feb 27, 2017 16:52:59 GMT -7
You can see the top photo how clay is buldging out windows from packing it in the bottom then you can come back and scrape it off . For me this works the best . Other people will use plastic wrap inside befor they add clay . It will still squeeze out and you need to push it back in. Try and get it as close as possible to the inside of window opening .
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Post by superstock on Feb 28, 2017 6:41:15 GMT -7
thanks rocky... you answered them all...show some more steps, I will have more questions...superstock
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Post by Excrewchief on Feb 28, 2017 10:03:31 GMT -7
I will show more as i go.it should be real quick.
I will try and explane the use of lego's and plexiglass etc. And try to give you info on different ways of doing things. Everybody has there way that they like best. The main thing is to find your way with the best end result. I do know greg might do something his way and me a different way but the customer see's no difference and i will say his quality is top of the line and cat say that i have seen higher quality anyware. I my self have more of a production background and all he cars about is the quality. And that is very very good but if it takes two weeks to make a body or two bodys a day or even five you have to be quick and good . As for somebody doing only product for there own use time is not an issue. That is the reason i will try and show some different ways to do what you need and you can tune it to what you want. Thanks
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Post by superstock on Mar 2, 2017 7:51:24 GMT -7
rocky..waiting on next installment..superstock
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Post by Excrewchief on Mar 3, 2017 7:09:34 GMT -7
The next step for me is to take a piece of card board at this point i take the body or parts and take a drop or two of super glue and glue the clay to the cardboard. This is so the part cant move around or float at all also when you clay up your part try and picture the clay as part of the mold and what is going to do to get the part out of the mold. The reason for this is after you use legos or plexiglass or what ever you have use etc. To build a wall around the parts or body your going to start mixing your silicone.  |
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Post by Excrewchief on Mar 3, 2017 7:16:43 GMT -7
I dont have a lot of pictures for this the one above is how i take legos a i use white school glue and glue it to the cardboard then set a weight on it to dry apx 5 to 10 min with good glue. ( dont use superglue or epoxy ) you will have to take it apart and it will mess up the legos or what ever you use. The white school glue peals off easy when you want it to. After all this you are going to start filling the mold with you silicone mix.
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Post by Excrewchief on Mar 3, 2017 7:41:53 GMT -7
This is where your quality will show up. At this point is were you need aa vacuum pump when you mix the silicone you want to vac it down i dont rember the exact numbers a/c guys will. But at apx 18 to 19 inches of vacuum water will boil so all the air in the silicone will bubble and get sucked out we also add a special oil that is a retarder for the silicone and slows the dry or cure time for the silicone down this also allows any bubbles to float or vent to the top the less air you have the better the mold is going to turn out the bubbles that can show up you probibly will never see i have made molds without doing like single molds say valve covers or oil pans etc. And that can be fine to do some small parts here and there but if you goal is to make a nice professional looking part just get the equipment and do it every time you make molds . The big problem is if you have bubbles or holes when you just poor resin it may look ok but you will spend a lot of time using a toothpic trying to get the resin were you want it and air out . And you will get some parts that are nice and a lot that you throw away. If your just doing your own you can get by this way but if your like me you wont be happy.
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Post by superstock on Mar 3, 2017 8:20:23 GMT -7
what is the special oil, you are talking about?? how much distance do you allow on the sides, top an bottom of mold box?? what name an # of silicone do you use for mold box?? told you I will have questions.....more questions later as you go thru the steps..also how thick is the clay on bottom of body between it an bottom of mold?? thanks rocky..........superstock
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Post by Excrewchief on Mar 3, 2017 9:57:05 GMT -7
I like it when you ask questions it is a lot easer to answer the ones you want that way.
I was taking a break and then going to answer some more for you.
The oil as they call it is called slow-jo
Silicone cure retarder. SO# 27140b
Made by smooth-on....
I use apx 3/8" of clay on the bottom of the body and about a 1/2 " wider and longer than the body.im going to pause and try to get a picture or two.
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Post by Excrewchief on Mar 3, 2017 10:06:06 GMT -7
 Above picture shows what the clay looks like . On the bottom will become the top of the mold . |
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Post by superstock on Mar 3, 2017 10:18:59 GMT -7
rocky..what are the partial holes in front an rear windshield for?? superstock
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Post by Excrewchief on Mar 3, 2017 10:21:08 GMT -7
 You can see the bottom of the body better in this picture. Above |
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Post by Excrewchief on Mar 3, 2017 10:24:13 GMT -7
This shows how they go together.  |
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Post by Excrewchief on Mar 3, 2017 10:29:05 GMT -7
The holes in windows are a relief for the resin to squeeze into . It also helps lock the molds together alignment wise.  |
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Post by Excrewchief on Mar 3, 2017 11:18:12 GMT -7
Here is the body after silicone has been poured and cured .
Then the clay has been removed the next step is spay with mold release then fill with silicone and alowed to cure .
Then the fun of removing the inside of mold than the removal of the body used to make mold or master as it's known the next step would be to make some holes in the inside mold part .
The best way is use brass tube sherpen the end and push it through all the way ( on the inside mold only ) use small tube like 1/8 " this gives the excess resin a place to escape. It is kind of a trial and error as to were to put the holes as you get experience you can look and see were you want them. This is how you keep from having the thick flashing around the windows etc and makes for a much more professional mold. Doing this and vacuuming the silicone makes a world of difference in your mold quality. Now when you use pressure to cast your parts if you did not vac the silicone to get the air out those small pin holes will open up and you will have thousands of little bubbles they kind of look like little fuzz balls you mold will look fuzzy instead of smooth. I through lots of parts and molds away learning if your real good you can slush cast by using the outside only of a mold pouring in resin and keep it moving untell it cures pour more and just keep doing it untell your done i have done this and had it turn out very nice .
Most of the time it looks very poor . A lot of stuff on ebay is done that way . But you will not get a good reputation doing this kind od work and if your trying to make money you also will not get many return customers. I have had people send me parts they had got in the mail this way for me to fix all i can say it good that i dont charge them by the hour ( most are friends ) because it will normally take me 40 to 80 hours or more just to make the body to my standards then ill make a mold recast it to give them a nice part.that they should have got in the first place.
That is the part that makes me really mad i hate it because many of these people think they turn out nice work they are just to stupid to see it. That is the reason we started this forum to teach .
The bad thing is this is not my thing im not very good at it and dont really like it .
Greg is much better at it than myself and i wish he would hurry up and get done moving. I have probably made 10 plus molds during this story and could have been twice that . Oh well thats life if it helps than im happy. There is a lot more to come but for now i have to come up for air.keep asking questions and i'll try to keep giving answers also if it does not make sense let me know as i stated this is not my thing maybe i will get better as you get better casting
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Post by superstock on Mar 3, 2017 11:20:54 GMT -7
rocky...ok... are you going to cast a body next?? so I can see how that is done?? superstock
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Post by Excrewchief on Mar 3, 2017 11:24:25 GMT -7
You can see the bottom of the body better in this picture. Above The holes should be in all the windows i messed up and only did front and rear. It does make a difference so do all the windows and were the wheels are helps to . I made this mold about 2 am and was not thinking like i should depending on how it goes i may end up making a new mold one guy alone is talking more bodys than this mold should make we will see. |
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Post by Excrewchief on Mar 3, 2017 11:33:16 GMT -7
I need to get caught up on a couple of things i also need to talk with greg and see how his move is he is much better at getting photos and posting . I wont be doing any casting for a couple days only some small things ill try to get photos when i do .
If you have any photos of what your doing dont fear posting . It helps me to see your trying to get things done also. Just go for it.
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Post by Excrewchief on Mar 6, 2017 13:36:14 GMT -7
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Post by Excrewchief on Mar 6, 2017 13:37:05 GMT -7
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Post by Excrewchief on Mar 6, 2017 13:37:57 GMT -7
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Post by superstock on Mar 7, 2017 8:02:35 GMT -7
rocky..looks like you are the body next??? thought you would take the clay out, an mold the inside of body first?? superstock
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