
Builder Last Online: Mar 2022


Model Scale: 1/8
Rating:
(1 votes - 5.00 average)
Thanks: 0

Started: 05-02-10
Build Revisions: Never

Hello to everyone, I'm bill, I'm building a 69 Camaro, I made some corrections on a suspension part and have to make a new mold so I thought
I'd give a tutorial on molding and casting
. these first pics are the tools I use, spreading and surgical blade. The parts I will be molding and
casting
are lower A frame and sway-bar links. in the third pic the gates and vents are glued to the parts. The A frames have a gate and a vent, they will be gravity poured. The links will be vacuum filled.
Photo: suspension 023 | mold making and casting album | Bills69camaro | Fotki.com
http://public.fotki.com/bills69camaro/mold-making-and-casting/suspension.html
Photo: suspension 001 | mold making and casting album | Bills69camaro | Fotki.com
The next few pics show the mold box and mounting the parts. I use 1/4" foam core board to make my boxes. I make the box 3/4" larger than the box on all four sides. I mount the part on the floor of the box and measure the sides, in this case the box will be 3-3/8" long x 3" wide x 3" high. Add it up and you get a piece of foam core 3" x 12-3/4" + 1/2" overlap at the end. I score the foam core panels on one side to the dimensions and fold to make a box with 1/2" extra on the last panel. I then fold to make a box and hot glue all four corners for extra hold. Last I
hot glue the box to the floor.
Photo: suspension 004 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 002 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 006 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 007 | mold making and casting album | Bills69camaro | Fotki.com
The next few pics I mix the RTV. I use a platinum base clear RTV, it's easy to see the part for cutting open the mold. The formula for figuring the amount of RTV is length x width x height ÷ 16 x .625. OK 3-3/8" x 3"
= 10.125 x 3" high = 30.375 ÷ 16 = 1.898 x .625 = 1.186 lbs. to convert .186 to oz. multiply .186 x 16 = 2.976 oz. I round up to 3 oz. so
we have 1lb. 3oz. Normally you would figure the area of the part and subtract from the RTV total, but the parts are small and the amount of RTV saved would minimal. I make my boxes 1/2" taller and draw a pencil
line for a fill line, which for this mold is 3". I vacuum the RTV to eliminate
air bubbles in the mold. The bubbles you see in the mold just poured are
caused by the pour and are minimal, they rise to the top and disappear.
Photo: suspension 008 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 010 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 011 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 032 | mold making and casting album | Bills69camaro | Fotki.com
Here the molds are cured for 24hrs. taken out of the box, cleaned and cut open. I wiggle the knife while cutting to get a scalloped cut, this keeps the halves from sliding and helps with registration. The last pic shows
0090 x 5/16" bolts with the heads cut off.
Photo: suspension 019 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 020 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 022 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 012 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 014 | mold making and casting album | Bills69camaro | Fotki.com
The next pics show the threaded inserts in the mold. The molds are taped shut with 2" packing tape, funnels made from paper (card stock). The large mold is gravity poured and the small one is vacuumed in a vacuum chamber, the air is pulled out and when the valve is opened on the chamber it sucks the resin into the mold cavity. The last pic shows the molds filled and ready for the pressure pot. I cast under pressure to remove any air bubbles from the part. I added another mold I did earlier
rubber bushings for the sway-bar links.
Photo: suspension 015 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 016 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 017 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 018 | mold making and casting album | Bills69camaro | Fotki.com
The last group shows the molds open, the parts taken out, sprue's and vents cut off. I hope this helps some. If there are any questions just ask and I'll try to answer them.
Photo: suspension 025 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 026 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 028 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 030 | mold making and casting album | Bills69camaro | Fotki.com


I'd give a tutorial on molding and casting


Photo: suspension 023 | mold making and casting album | Bills69camaro | Fotki.com

Photo: suspension 001 | mold making and casting album | Bills69camaro | Fotki.com
The next few pics show the mold box and mounting the parts. I use 1/4" foam core board to make my boxes. I make the box 3/4" larger than the box on all four sides. I mount the part on the floor of the box and measure the sides, in this case the box will be 3-3/8" long x 3" wide x 3" high. Add it up and you get a piece of foam core 3" x 12-3/4" + 1/2" overlap at the end. I score the foam core panels on one side to the dimensions and fold to make a box with 1/2" extra on the last panel. I then fold to make a box and hot glue all four corners for extra hold. Last I
hot glue the box to the floor.
Photo: suspension 004 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 002 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 006 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 007 | mold making and casting album | Bills69camaro | Fotki.com
The next few pics I mix the RTV. I use a platinum base clear RTV, it's easy to see the part for cutting open the mold. The formula for figuring the amount of RTV is length x width x height ÷ 16 x .625. OK 3-3/8" x 3"
= 10.125 x 3" high = 30.375 ÷ 16 = 1.898 x .625 = 1.186 lbs. to convert .186 to oz. multiply .186 x 16 = 2.976 oz. I round up to 3 oz. so
we have 1lb. 3oz. Normally you would figure the area of the part and subtract from the RTV total, but the parts are small and the amount of RTV saved would minimal. I make my boxes 1/2" taller and draw a pencil
line for a fill line, which for this mold is 3". I vacuum the RTV to eliminate
air bubbles in the mold. The bubbles you see in the mold just poured are
caused by the pour and are minimal, they rise to the top and disappear.
Photo: suspension 008 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 010 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 011 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 032 | mold making and casting album | Bills69camaro | Fotki.com
Here the molds are cured for 24hrs. taken out of the box, cleaned and cut open. I wiggle the knife while cutting to get a scalloped cut, this keeps the halves from sliding and helps with registration. The last pic shows
0090 x 5/16" bolts with the heads cut off.
Photo: suspension 019 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 020 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 022 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 012 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 014 | mold making and casting album | Bills69camaro | Fotki.com
The next pics show the threaded inserts in the mold. The molds are taped shut with 2" packing tape, funnels made from paper (card stock). The large mold is gravity poured and the small one is vacuumed in a vacuum chamber, the air is pulled out and when the valve is opened on the chamber it sucks the resin into the mold cavity. The last pic shows the molds filled and ready for the pressure pot. I cast under pressure to remove any air bubbles from the part. I added another mold I did earlier
rubber bushings for the sway-bar links.
Photo: suspension 015 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 016 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 017 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 018 | mold making and casting album | Bills69camaro | Fotki.com
The last group shows the molds open, the parts taken out, sprue's and vents cut off. I hope this helps some. If there are any questions just ask and I'll try to answer them.
Photo: suspension 025 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 026 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 028 | mold making and casting album | Bills69camaro | Fotki.com
Photo: suspension 030 | mold making and casting album | Bills69camaro | Fotki.com


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