Post by Brian on Jul 21, 2018 13:22:53 GMT -5
I am going out on a limb here and trying something new for the forum.......I believe that it will be a benefit for everyone. This is something that anyone here can do, and that I wish everyone here would do.
I belong to a couple of other forums where Works in Progress or WIPs are quite prevalent. One is Ford Torino owners website where members show their WIPs on their cars that they maybe restoring or simply doing work on. Another site is model car website geared towards racing competition cars....the WIP's there show the start to finish on a project and what it took to get there.
A WIP encourages input not only from the original poster , but from members who are able to share their knowledge and expertise as well. I cast parts and pieces for scratch building model stock cars, but that doesn't mean that I cant gain knowledge from someone who cast fishing lures or pen bodies.
A WIP is not a one sided post from the original poster...for the thread to thrive it takes input from others....even if its a thumbs up, good job.
This WIP involves casting a set of H.O scale (1:87) Silver Streak passenger car/caboose platforms. These platforms are at least 50 years old and extremely brittle. One platform has developed a crack in it which could make demolding it a difficult challenge. It feels like they were originally cast with some sort of soft metal. I'm doing this project for one of the "'ol railroaders" Tony Fox from the local hobby shop that is the mecca for model train hobbyist. These platforms come from a kit where the rolling stock is put together in the same fashion as a model kit is put together.
These are the platforms, the one has developed a crack, so making a mold is a must to preserve these platforms in resin. Tony scratch builds rolling stock (train cars) and he likes the look of these particular platforms which he will be able to use on passenger cars and cabooses.
I attached toothpicks to the bottom of the platforms with CA (super glue) and then glued the toothpicks together. The holding device has come in quite handy with resin casting as I am able to suspend the piece being cast in the mold. This mold "box" is nothing more than the bottom portion of a large size McDonalds plastic soft drink cup.
Everything is aprox. 1/4" apart...1/4" above the cup bottom, 1/4" away from the sides of the cup and aprox. a 1/4" between the parts to be cast. There is a mark on one of the toothpicks that is 1/4" above the platforms. A 1/4" insures that the mold wont distort, yet flexible enough to demold.
Used up what I had left of some HS-3 and made a mix that ended up being aprox. 1/3rd HS-2 and 2/3rds HS-3 (87g total by weight) added 9g of catalyst....not expecting any issues, fingers crossed. This is going to be a partial rubber pour so that I can allow the air bubbles to come to the surface and pop since RTV bonds to itself anyway.
Now a red solo cup is the best receptacle
For barbecues, tailgates, fairs and festivals.....
And I might add mixing rubber -n- resin to this Toby Kieth song....I digress
I use the smaller Dixie bathroom cup to pour and weigh using a Gram scale and the Red Solo cup to mix in..... seen them used for mold forms as well. Save the plastic ware that you may get from the drive thru or carry out, its quite useful for stirring.
That's it for right now, more to come!