Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards

andypugh wrote:

Todd wrote:

It is showing nearly a 1 inch following error during the acceleration phase of the move.

Isn't that 6 milli-inches? Or am I misunderstanding?
(I had been interpreting it as microns, and thinking it looked quite good)

Oops, I saw the 200m/div for the vel-cmd and thought that was the scale for the following error. In that case it wasn't that bad.

Many thanks!

The velocity trace is back on in the hal meter.




compare this to prior screenshot of nearly same name.

many thanks!

Try setting your max_acceleration to 8 or 10, (and I think you might be able to set the max_velocity a bit higher try 1 or 2).

What does more FF2 do?

Many thanks, Todd! The f.error is best yet.

Attached are a few pics and .ini file, read file name for description of trace.







many, many thanks to all that have been part of this project!

Many thanks!


Attached are a few pics of hal trace after ini file max- vel go from 1.0 (in prior post) to 1.5 and then to 2.0, read file name.




Edit: This is the best f.error setting,(the gain is set very high!) : forum.linuxcnc.org/media/kunena/attachme...00003_2017-05-08.png

The f.error is lower than ever!

Many, many thanks!

Thanks to Todd, Andy, tommylight and lakeweb for your kindly help!

This is the lowest hal scope trace of the f.error value, notice the gain is set lower than the other hal trace so far. I am very thankful to all, that make this place happen!



many thanks

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.