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Thread: How to reproduce parts.

  1. #31
    Join Date
    Aug 2016
    Location
    East of Worcester ma
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    1,326
    I Never realized how many different forums/writings there is out there on this, and there is definetly some conflicting info out there. just have to wait for the fedex guy now.....thanks again

    Shep
    Last edited by Shep1970; 06-14-2017 at 07:12 PM.

  2. #32
    Join Date
    Apr 2002
    Location
    s.w. michigan
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    Have you built or bought a vacume chamber yet for pulling air out of mold rubber and resin mix ?

  3. #33
    Join Date
    Aug 2016
    Location
    East of Worcester ma
    --
    1,326
    Not yet- i've been browsing ebay, probably going for a 3-gallon, i suppose they all work about the same. I couldn't have too many packages delivered the same couple days or the wife would get nosey. I got tin-cured mold max 30/platinum-cured rtv-22a i believe it was and Click image for larger version. 

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ID:	244012 but in like 2-pint or so sizes. Just to experiment.
    Oh- and some color Click image for larger version. 

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    I need to pick up non sulfer clay too(one guy i read about uses playdough? But i'll get plasticine
    Shep
    The wife figures it all out eventually, but she's good.
    Last edited by Shep1970; 06-14-2017 at 08:43 PM.

  4. #34
    Join Date
    Apr 2002
    Location
    s.w. michigan
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    6,500

    Vacume chambers

    You will definitely want to get a vacume set up in place before making any molds or resin pours.
    There will be pockets of air in mold for sure,,, maybe right at your pattern peice (part you are making mold of).
    I made my main container from a scuba tank and home made gasket. Vacume machine came from work,,, free. 3/4 inch lean came from MSc industrial supply and was over 100 dollars. Imploded 1/2 inch plexis glass and it was VIOLENT !
    I also pressure cast as much as I can. The Tecate intake boot mold is in there now,,,, I am low on those 84/85 ones.
    Various pics of rest of hobby room of work area, mold library and,,,,, stuff.
    Harbor freight for painters pot to turn into pressure caster.
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  5. #35
    Join Date
    Aug 2016
    Location
    East of Worcester ma
    --
    1,326
    Geez, you'll have to move into that re-done garage.... I read about the painters pot system somewhere, looks good.
    I like the bilboard of notes....
    Shep

  6. #36
    Join Date
    Apr 2002
    Location
    s.w. michigan
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    6,500
    Lol ,,,, those are all of the Mrs. and mine recipes. Gram amounts, proceedures, tip.
    Different company's resins vs. another company's product.
    Memory is shot,,, gots to have notes
    Hopefully your wife will find a interest in this type of hobby.
    Mine just swipes all the little molds and wants nothing to do with roto mold or pressure casting.
    BUT, the kicker is when I sell a part she gets the money cause she made it ! I buy everything ,,,,,, Oh what the heck.
    Happy wife = happy life

  7. #37
    Join Date
    Aug 2016
    Location
    East of Worcester ma
    --
    1,326
    Im really feeling like a mad scientist now john. Kids say i need one of those white dr. gowns. I said i'd get one of the reverse
    Tied in back butt hanging out one's....(joking) Click image for larger version. 

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    Shep
    Last edited by Shep1970; 06-26-2017 at 02:57 PM.

  8. #38
    Join Date
    Apr 2002
    Location
    s.w. michigan
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    Looking good Shep !

    Looking like a pro for sure !
    Next a pressure casting device ???
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  9. #39
    Join Date
    Aug 2016
    Location
    East of Worcester ma
    --
    1,326
    Pressure casting-maybe in time... For now i'll just fool around with what i have. (This winter maybe)
    Been playing with the vac chamber, there's alot more air trapped in the mix than i would have thought.
    One of the rings came out but broke, (bjb mix) its pretty thin in areas, have another one in mold now.
    The tank rubbers were before i recieved vacuum (air bubble). But i have another one (vacuumed) brewing now, so we'll see. Click image for larger version. 

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    Shep

  10. #40
    Join Date
    Apr 2002
    Location
    s.w. michigan
    --
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    Wow, darn near gin clear on the broken peice. Mighty addicting hobby ~ eh

  11. #41
    Join Date
    Aug 2016
    Location
    East of Worcester ma
    --
    1,326
    VERY addicting hobby. 2nd-3rd ring came out but there very fragile where the part is very thin. Im going to keep trying with the tc-878 i have more on the way. The problem i'm having is i always make a little extra so i make a mold for the extra.
    Things just keep multiplying!!! Click image for larger version. 

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    Edit/ got it,(different product) but i can see where a pressure tank would come in handy with those air pockets.Click image for larger version. 

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    Shep
    Last edited by Shep1970; 07-07-2017 at 11:19 AM.

  12. #42
    Join Date
    Aug 2016
    Location
    East of Worcester ma
    --
    1,326
    John, hope its ok i put this here-
    Its been very cold last few days i've got some work done on the 86/87 headlight shell, i know the 250r is close but i gotta try the 200x one. I have the outer shell mold cast and now/next for the inner/core. I'll update when theirs some more progress/or...
    I have to try compressed air to remove this pattern, its still holding in one small spot i cant get to. Also i dont want to damage this vry nice shroud im using. Only issue is the compressor is in the garage and its 3 degrees(too cold for me) im just glad all my silicone set nice.
    Here's pics
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    Ps, this is a pain in the *** but its coming along.

    Shep

  13. #43
    Join Date
    Apr 2002
    Location
    s.w. michigan
    --
    6,500
    Shep, use rubbing alcohol to help free part from your mold. It will not hurt your silicone mold rubber one bit and should not harm oem part you used as pattern.
    With most resins we make parts from we need to be a little cautious using rubbing alcohol. BJB'S TC 878 ain't too much liking long term exposure to it,,,, but once part is retrieved compress air blown on part evaporates it quickly enough.
    I give all the flywheels a rub down with rubbing alcohol to remove oils and what ever before clear coating.
    Mrs. just got done doing a one off mold and part for anther board nember,,,, probly the only car part not currently being reproduced (he paints the details)
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  14. #44
    Join Date
    Aug 2016
    Location
    East of Worcester ma
    --
    1,326
    Thank you john, the rubbing alcohol trick was "very"much appreciated it loosened it all up just enough.
    Now to clean it all up to put it back together for step#2 or rather step about #7 well u know...
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    In one of many test i had to run- found that lowes/home depot rubber plugs are "not" compatable with platnum cure, glad i found that out though..could have been a disaster- made my own plugs (clear ones) black is store bought
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    Needed the plugs so i could fill the section in front of the light brackets so the inner core could have the brackets molded in like oem. “Should work”, the plug area also will give the halves something more to line up with(lock into) well we’ll see
    Shep
    Last edited by Shep1970; 01-06-2018 at 11:34 AM.

  15. #45
    Join Date
    Apr 2002
    Location
    s.w. michigan
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    6,500
    C'mon Shep,,,, you have a reproduction headlight shell yet ???
    I know better then anyone these sorts of things take time but, yeah,,,,, I'm impatient too

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