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This is the third project that I'm doing for Open Door
Escape Games, which is for their new room with the scary theme. My
son-in-law asked for my help with another motor install, but this time it's going
to power the hand crank on a Jack in the Box. I think the reason that
the customers won't be turning this crank themselves is because they
will be locked behind a gate. But they will still here and see what
happens once the song starts. This motor is small, only
about 1 1/2" in diameter by 3 1/2" long with a 6mm shaft and runs on
12v. This will also need a pulley system to drive the crank.
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Here is the hand crank that my son-in-law
made out of 3/4 PVC pipe. He glued some rope to it making it look pretty
good. The white part is what goes inside the jack in the box and will be
spun by that motor.
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My son-in-law removed this this 2 X 4 from the
jack-in-the-box and I brought it home to work on. The hole that you see
is where the crank passes through, but the PVC doesn't fit it very well
so I'll be making a bushing for it. So lets get started...
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Working With Metal
I made this bushing out of aluminum, which will get pressed into the
2 X 4.
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This bushing is a close fit so the PVC doesn't have much slop and should
work better this way so it runs true.
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I made the bushing slightly bigger than the hole in the wood. Here I'm
using my boring head to enlarge the hole so the bushing will have a
press fit.
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Just a close-up of the boring operation. Is this overkill? Yes, but
I'd rather do it this way so it will last.
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This only took a few minutes to bore out and should work great.
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Pulley Assembly
Now it's time to work on the pulley system. As you can see the
plastic pipe is too long so I'll be cutting that down slightly.
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Here are the pulleys and V belt that I'll be using. However, I'll need
to make some adapters for each pulley so I can use them.
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