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This project is for a new game that will have a scary
theme because it seems that people really like being scared these days.
Anyways, my son-in-law wanted my help with installing an electric
motor that would move an arm about 180 degrees. Now this motor
will be mounted under a plywood floor and I'll use pulleys to help move the
arm. Also this motor has two rpm's depending on how you wire it and he
wanted it to go as slow as it could.
This arm will have a button on the end of it that the
paying customers will end up pushing, but I have no idea what happens
after that. Now that you have an idea of what I'll be working on, lets get
started.
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| Working With Metal
The shaft on this motor has two different diameters
(arrows) which means I'll need to make an adapter so it will work with a
store bought
pulley that has an inside diameter of 1/2". Now this motor shaft is only about
5/16" in diameter and the threads are even smaller. No big deal but I'll
return to this part of the project later.
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The motor has three mounting holes so I made this cardboard template to
get an idea of what I'll need to make. Also, I'll be making this mounting
plate out of aluminum.
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I'm using my table saw to cut some aluminum plate to a size of 6.5" long
X 5" wide. By the way, this aluminum plate came from a road sign that is
just under 1/8" thick.
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I machined a 1" center hole to clear the shaft and I've also drilled
three mounting holes for the motor.
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I made these 'stand-offs' out of 3/8" steel, that
will be fastened to the mounting plate above. The other end will be
fastened to another plate that will be mounted to the floor. The size of
these steel pieces are 3" long and I tapped some 10-32 threads in each
end.
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I drilled holes at each corner for the stand-offs.
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Here is the other plate, which is also aluminum and is the same size as the other one.
But this one is 3/16" thick. The
blue lines represent where I'll be putting some adjustable mounting
slots soon.
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Here is what it looks like so far. And it's incredibly rigid, which is
what I needed.
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I'll be using some 5/16" bolts to mount this so I made
my slots 3/8" wide by 4 inches long. Also notice the countersunk holes.
This was necessary
because the bottom of the plywood floor will be against this surface.
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