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Discussion in '3D printers' started by Arunkumar, Dec 15, 2015.
Polar Bot which used to depress buttons
Arunkumar published a new build:
Read more about this build...
We are building and fine tuning the bot but currently we are facing some issues with regards to the lateral vibrations at the extreme ends (free pulley end) of the extrusion during the stopping of the NEMA 23 motor. Please find the attached TOP view diagram of the polar bot. Any solutions will be appreciate in order to minimize the vibrations.
As you are only connected to a central pivot point (the nema 23 motor), I don't think you will be able to dampen the lateral vibrations at that length and weight. At a minimum you need a second point (such as affixing your pivot point to a stand and having the motor positioned further down the arm running around a large gear).
What are you running for firmware? Besides changing the printer mechanically, you could just try reducing the jerk. It might also help to reduce the current of your stepper. Another option would be to change the size of your extrusion. The picture doesn't depict much and it is hard to see how hard it would be to implement, but if from the perspective in the picture, if the extrusion was made wider, the maximum strain would be reduced because material on the sides would increase. Similar to the concept of I-beams.