Speed restriction.. is it possible ?
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I hav a couple of printer, they have ballscrews on X and Y axis. The "propblem" is (already asked to the motor manufacturer) is if I run a 42/45 mm/s speed and in the middle of X position (printherad at the middle of the ballscrews lenght) you can hear a vibration starting to grow up till the vibration becomes an earthquake and only when moving on negative direction.
manufacturer says Im hitting the resonance point of the setup. This problem never happens with any other speed.
So my question is: is there any way from firmware to restrict this range of speed of being used? -
@Tinchus thats exactly what Input Shaping does
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@oliof But The vibration Im describing has no visible effect on the print, so how can I measure the vibration (I dont have special equipment for that)
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@Tinchus Download an audio frequency finder and use your phones mic as the input. alternatively you can put the phone against a surface that would "hear" the vibration as this is a quick engineering hack.
Then use the input shaper to try and cancel the frequencies being generated.
However this is unlikely to fix the issue as whipping of a ballscrew is not an impulse vibration but instead a constant generating frequency. the best bet is to either limit the speed via max speed limit, or add dampening to the ball screw.
(this could be adding a bit of slop to the screw, or another item to absorb the vibrating force before it can grow.
If you are using very high quality ball screws, you might be able to get away with constraining one end (if you are using a pillar block setup) and replace it with a compliant spring holder. enough to hold it in position, but also to flex absorbing the frequencies when its generated.)
