Mechanism (sisbot) removal
- The first half of this video details removing the sisbot from your table. Once removed, continue to the next section
Theta motor removal
- With the sisbot removed, identify the theta motor and its wires.
- Using scissors or wire clippers, cut the wires coming from the theta motor being careful to not cut or nick any wires other than the 4 coming from the theta motor.
- With the wires cut, unplug the other end from the controller by squeezing the tab and pulling out.
- With the wires disconnected, pull them out of the wire tie and dispose.
- Turn the sisbot face-up and identify the 4 screws securing the theta motor.
- Using a #2 Phillips screwdriver, remove the 4 screws.
- With the screws removed, slide the motor towards the center of the motor plate so the belt can be lifted from the pulley and the motor can be removed.
- The resulting screws, nylon spacers, and the old motor will not be re-used and can be disposed of.
Installing new theta motor
- Using the motor and screws in the theta motor replacement kit, place the new theta motor in position with the wires facing towards the center of the motor plate and align the screw holes with the slots.
- Insert the screws into position and begin turning them. Do not tighten them yet.
- With all 4 screws in place lift the belt in place around the pulley.
- Check that the belt is in position around the pulley and large gear.
- Tighten the four screws so they seat in line with the indents from the prior motor.
- When the screws are tightened into the existing indents, the belt tension is correct in most cases.
- To check this, very lightly push the belt.
- It should not easily move more than an 1/8 inch in either direction.
- If the belt is too loose you can loosen the 4 screws, slide the motor back and re-tighten the screws.
Re-install the sisbot in your table
- Continue the second half of the video at the top of this article
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