Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards

In this image forum.linuxcnc.org/media/kunena/attachme...iniacc10.0vel1.0.png you were able to invert the following error spike during acceleration. This tells us that you should be able to almost completely zero it out by finding just the right amount of FF2 to apply.

It looks like you will eventually find a very well tuned set up. Don't be afraid to experiment with higher maximum velocities. You may find that you can achieve as high or maybe even slightly higher rapid travel rates than you had with the original control. The limit will be the maximum voltage of your servo power supply. The limit for your max acceleration is the maximum current your servo drives can supply. It is probably best to leave a little headroom here because under load the current needed will be higher (In other words, it won't be able to accelerate as fast under load.)

Todd, many thanks for all your help!

Attached are a few pics of the best yet of x and y axes traces. The max acceleration helped a great deal, will post .ini file next time. How do the axes trace look, both are the same "gain" scale, the f.error I can move/shift the 0.0 of the trace, but not having a lot of luck reducing the spike. The trace will vary about 1/10th of the scale w/o changing any settings, just push jog again.



Many thanks! Your comments/suggestions are warmly welcomed.

What happens to the spike, with FF2 set to about 1 for the X axis and about 0.1 for the Y?

thanks, Todd!

Attached are several pics of the x and y axes hal scope trace. I inserted the lowest f.error trace below: The other screenshots are of the FF2 as per your request.




Many thanks!

Edit: the "gain" was changed in some of the screenshots, beware.

Many, many thanks!

This is got to be getting close. This is the highest "gain" range yet.



Welcome your thoughts.

Many thanks!

Looks pretty good. Congratulations. Now you just need to get that Z axis hooked up.