|View single post by Ray Dunakin|
|Posted: Tue Nov 14th, 2017 07:23 am||
A few days ago I posted this photo of a styrene test piece for the covers on the engine:
My plan was to make a rubber mold and cast these things in resin. But that test piece was too rough.
Well, I tried a couple more and couldn't get it to look as good as I wanted.
So I tried a different approach, making it out of 1mm Sintra and scribing the indentations.
That turned out even worse:
Even if I could have created a suitable master, I had doubts about how well such thin pieces would reproduce as castings.
So I scrapped the whole idea and decided to come up with a non-prototypical design,
that would be simple enough that I could make all 20 of them individually.
My first test of this was extremely simple, just a flat piece of styrene with rounded corners and a nut/washer in the middle:
But I felt that this was TOO simple. I wanted something that looked a bit more interesting.
The design I settled on was made by layering two pieces of .020" styrene.
Both pieces had the corners rounded, and I beveled the edges of the smaller piece before gluing it on top of the base piece.
Here's how they turned out:
I also did some work on the base for the engine and generator:
Visit http://www.raydunakin.com to see photos of the rugged and rocky In-ko-pah Railroad!