I need a mold exactly like shown. It is a 3" cylinder and the boxes are 1.5" high, so I am making a 1.5" half cylinder and I need the bottom where I have the cut cardboard circle part of the mold. I was thinking some paper towels with epoxy. Is there a better or simpler way?
So your making a cylinder.
Not exactly sure what you are trying to accomplish with paper towels and epoxy? I HAD thought that you were wanting a way to seal that end so you could make a mould from the whole thing?
If so, there’s a plethora of easier ways to do it than with paper towels and resin! The simplest would be to just cover the cardboard with polyethylene packaging tape. Or replace your cardboard semi-circle with some core flute. However, have you made that end a straight 90 degrees? If so, you are going to struggle with the draft angle when it comes to release. If that end is going to be cut out of your final parts, I suggest angling it or building it up with wax/plasticine/clay so that you have a positive draft. Even better would be to leave it out of the mould completely by building your flange vertically on that side.
But I may be getting ahead of myself with my advice given I am still struggling to understand what you are trying to achieve…
The cylider is actually the magnets on a brushed motor from a scooter. The motor sits inside a metal cylinder on the scooter frame. I need to slide this half cylinder inside the frame, bolt it to the frame and use it as a motor mount for a smaller but more powerful brushless motor. The part needs to look like this
Here are a few more pictures to see what I am trying to accomplish. The stock motor fits inside the frame like shown in the second picture. I am installing the smaller motor which is 3 times more powerful so need some kind of mount to support the motor otherwise it will break that small metal lip off overtime from the extra force.
Will you be using vacuum or just wet lay up
If it’s not a cosmetic changes thing I would wax the part really well. Wrap just a little bigger then you want for a part (so you can trim) do your build up. Slide it off the cylinder and cut excess