input shaping. Feature Request

Hello from Pinder.

I was looking at how much difference Klipper with input shaping make in 3d printing.
I was hoping this would be a nice feature for Routers Lasers and plasma Cutter.
Klipper uses a USB accelerometer for calculating resonance freq.
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thank you in advance

Pinder

Yes it does, it just avoids the resonant speeds by lowering feed rate.
3D printers move at very fast rate with huge accelerations and use belts that get stretchy at those rates, so for us it wont change much, if anything.
It works for X and Y axis only, we have a bit more, well plenty more when we count in the joints.
Mills and lathes have other vibration issues that input shaping can not fix.

Hey Tom
I agree this is not much useful for millings.
I was looking for the opportunities it has in rapid motions for co2 lasers while engraving.
Even plasmas and Fiber lasers can use rapid move movements when not cutting.

tommylight wrote:

Yes it does, it just avoids the resonant speeds by lowering feed rate.
 

​I think it does more than just feed rate. It shapes the accelrations profile to compensate for resonance.
Huge scope for decreaseing production times.
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pinder wrote:

​I think it does more than just feed rate. It shapes the accelrations profile to compensate for resonance.
Huge scope for decreaseing production times.
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Sounds you are really talking about limited jerk or S curve accelleration. That is a huge can of worms.

pinder wrote:

Hello from Pinder.

I was looking at how much difference Klipper with input shaping make in 3d printing.
I was hoping this would be a nice feature for Routers Lasers and plasma Cutter.

I've had this same thought. I think it definitely has application here, especially where there is no real interaction between the cutting head and the material (e.g. plasma, laser, etc.). I've mentioned it before outside of the forum. I briefly looked into the math Klipper employs, and then got side tracked. It would require updating/rewriting at least portions of the trajectory planner.

There's also a whole other component necessary to measure the resonance in the system.

It would definitely be fun to test. Especially for changes in direction with my Y axis, it would be pretty easy to see if it made any difference.