synthetos / g2

g2core - The Next Generation
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Question on feedrate config values #458

Closed DeanCavaliere closed 4 years ago

DeanCavaliere commented 4 years ago

Depending on which settings_ you look at on here, you can see different values of things like jerk, feedrate, velocity, etc etc. The values of x and y are typically exactly the same but z is usually different. For example, in settings_shapeoko2dual, the x axis has a velocity/feedrate of 50000 while the z axis has a value of 1200. Why is this? is there a relationship between these values so that the x/y and z axis all move at the same relative speeds in reality? or can these values be arbitrarily chosen?

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justinclift commented 4 years ago

It's a "maximum" feed rate, and - for me at least - I tend to set it to what the machine seems happy with on that particular axis.

eg see how fast any particular axis seems to move in a reliable + repeatable fashion, then set the feed rate maximum for that axis to that value

The difference of X & Y axis feedrates compared to Z axis is probably due to different tech being used on the example settings. For example, it's pretty common to have belt driven motors run the X and Y axis, with the Z axis being ball screw driven. Belt driven setups seem to have much higher potential feed rates than ball screws. So, there's generally a difference there.

Does that help? :smile:

DeanCavaliere commented 4 years ago

Yes that helps so much; I got the impression there might've been a relationship due to the different modes of travel being used but if it's just dependent on machine performance then perfect. Thank you so much man

justinclift commented 4 years ago

You're welcome @DeanCavaliere. :smile: