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Cornchip's Revolver Arcade Project....Side art added.
blueznl:
I *love* it, would you be willing to share construction details on the rotating stuff?
IG-88:
Ya, I like to see them also.
clockwork:
After browsing through all your screens, I have to agree with everyone. I'd love to see plans too! Or just some explanation text on your images would be great.
Kaytrim:
:notworthy: Can't wait to see the full write up on the build. Especially on the rotating system.
Cornchip:
I'll try to describe my reasoning for making my rotating mechanism. I decided to keep the large disc to support the monitor (as seen in other designs) at the front and use rollers to support the weight. The disc is made from 1/4" aluminum and is 25 1/2" in diameter (Black anodized). 4 standoffs go between the aluminum disc to the 4 clearance holes in the monitor chassis. From the back side of the mounting holes are longer standoffs to connect to the rear mounting plate. This rear mounting plate has a driveshaft that is 'on center' with the 4 holes in the chassis. Basically the setup drives from the rear and also supports the weight.
The next thing I needed to select was a motor. A 12V DC gear motor is reversable by simply reversing the polarity by means of a switch or relay. I went with a keyed switch that is 'center off' and either side of that is FORWARD/REVERSE. When driving to each position..a limit switch was employed to kill the power to motor stopping the monitor where needed. This setup needed to be adjustable as there is a certain amount of deceleration after cutting power to the motor (adjustable end stops).
With the motor decided upon...next came the rotation RPM that I wanted. I guessed that 5 seconds allowed enough time to transit 90 degrees. My calculations are below worked backwards from the motor RPM at 12 VDC (my power supply is separate from my PC).
165 RPM at 12 VDC (motor)
Desired RPM of monitor 3 RPM (very slow).
First drive sprocket 10 teeth
Second driven sprocket 80 teeth
Total gear reduction is 8
165/8=20.626 RPM
I needed to do this a second time using the same ratio with identical sprockets.
20.626/8=2.6 RPM final
Why did I want 3 RPM final? Here's why.
60 second/3 RPM=20 seconds for 1 revolution.
20 seconds (1 revolution)/4 (90 degrees)=5 seconds.
My power supply is 13.8 VDC vs 12VDC so the motor runs a little faster. So I'm sure the final is closer to 3 RPM vs. 2.6. Perfect.
So I used a CAD/CAM program and made my own sprockets for a 25H roller chain. This is the same as used in pockets bikes...making it cheap.
I made a numbered diagram of the parts.
1 - Motor drive sprocket
2 - Primary driven/secondary drive idler shaft. Also used a chain tensioner.
3 - Secondary driven shaft.
4 - Limit switches for horizontal/vertical orientation.
5 - Monitor power interupt switch. Cam activated.
6 - CAM
7 - Rear support (3/8 x 3 aluminum). Has a bearing for #3.
8 - Denso 730556-7030 12VDC gear motor.
9 - Front plate
10 - Idler wheel for front plate (x4)
11 - Lower idler wheel mount (top is the same...just upside down)
12 - Rear mounting plate.
13 - Drive chain.
14 - Primary chain eccentric tensioner.
Hope that helps a little.
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