Make a practical turntable with two toy motors
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dawnchen239 2020-09-30 15:21:50

At first, I wanted to buy a shooting turntable, but I found that there happened to be two idle geared motors. So, I wondered if I could do something. Without further ado, just do it! The reduction ratio of the motor is 1:120. With the two gearboxes just increasing the power, the speed is reduced to about 1 revolution per 1 minute.

The completed turntable looks like this:

Bill of Materials 

1. TT Geared Motor with Back Shaft *1

2. TT Geared Motor (can be replaced by the back shaft one) *1

3. Rubber Wheel for A4WD and A2WD (Pair) *1 

4. 7.4V Lipo 2500mAh Battery (Arduino Power Jack) *1 

5. USB Charger for 7.4V LiPo Battery *1 

6. Paperboard *N 

7. Black Masking Paper *1

8. Black Electrical Adhesive Tape *1

9. Ice Cream Bar *10 

10. 3-Pin Rocker Switch *1 

11. 1kΩ Potentiometer with Rotary Button *1 

Get everything ready for the project, and then here we go! 

[rub hands] Wow, the geared motor with back shaft and the wheel

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Geared motor, which can be replaced by the back shaft one

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Take the back shaft one and remove the gearbox

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Remove the gear on the motor axis first

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Prise open the gussets on both sides of the motor

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This is what it looks like

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Remove the copper wire of the motor and the metal winding on the shaft rod.

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Set the shaft rod aside

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Drill a 6.5mm hole on the white back cover of the motor

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Apply quick-drying glue on the rod and insert it into the shaft of the geared motor with back shaft.

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Put the white back cover on

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Out the motor shell on

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Put the gussets on the two sides

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Remove the shell of the motor, fixed the buckle of the motor and insert them into the shaft together

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Install the gear removed before

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Put on the gearbox and screw it on

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At this point the two motors can also rotate each other, they must be fixed. The two motors can be held by small boards made of ice cream bars

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The bottom of the motor must also be padded with ice cream bars, which are later glued to the bottom plate of the turntable

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Draw a circle on the cardboard. I drew a circle with a diameter of 25cm. Use a carving knife to cut the circle on the cardboard

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 The 7.4V Lipo-Battery

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This is the charging pad with USB interface. If battery power is not needed, the battery and charging pad can be replaced by a power seat

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The 1kΩ potentiometer, and a matching rotary button hat with it

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The 3-pin rocker switch

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Connect as the picture shows

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After connecting, glued the motor and battery to the paperboard. When the motor is glued, it is necessary to pay attention to align the shaft with the center of the paperboard  

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Cut a 10cm wide strip paperboard.

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My paperboard has 5 layers, I am going to tear apart two of them.

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Cut it as the picture shows so that it can be bent.

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Fix the potentiometer on the base plate

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Open a hole of the size of the potentiometer's shaft at the corresponding position on the 10cm wide strip of cardboard

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Glue the strip paperboard on the side

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Glue the joints for reinforce

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Glue the black masking paper on the side of the paper board

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Fold the masking paper on the top into the box

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Glue the joints for reinforcement.

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Use cellulose tape to reinforce the masking paper inside the box

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Open a hole for USB interface

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Fix the charging pad on the baseboard

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Open a hole for rocker switch

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Install the rotary button hat

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The indicator will light in the box when charging, and we cannot see that because it's inside the box.

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Find some light-transmitting material, such as fiber optics on a toy. Cut one off when it is not looking at me. Stick it to the indicator light by thermal glue and open a small hole to guide the light to the outside of the box.

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Draw a circle around the box on a new paper board. Cut out a new paper board

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Find a black material that is easy to clean, here I use the black PVC film paper. Cut out a piece as big as the paperboard

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Glue the black paper on the paper board

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Glue the wheel at the center of the back of the paper board

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Wrap the electric tape around to beautify it

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Align the slot of the wheel with the shaft rod on the gearbox of the motor and insert it 

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Done!

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