DDSCV1.1 3 and 4 axis offline motion controller

[Boyan Silyavski]

If there is option to change Step edge ie: Active hi/lo then try this. You could be on the wrong side of the edge in which case you'll lose 1 pulse for every direction change.?

I always forget about that one, but as far as i remember was correctly set to work with normal BOB. I will now check again. In controller could not find a way to change that. I know where to change that in the servos. Will have to read the manual again though.

PS. alright, there is that in the controller, i found it. will try it later

In the controller, in the last part of the machine parameter you can fond the "interpolation period", set it up at 0,005 and try it, change even the "screen refresh" at not less than 4000, otherwise the screen will slow the cpu, as it not equipped with a graphic card.(you don't need to watch the screen, watch the machine).

Find even the "operating acceleration" parameter and set it up at 500mm is the diagonal interpolated acceleration try it and find a reasonable one for your machine.
Is just a bit of thing to try, maybe it won't help you, but it worth try.....

If you have servos, they are coming with resolver on the back, so your motors know exactly where and when they are at all time.
So, even with strong acceleration they shouldn't loose position... Here the problem: is your Router ridgid enough? Because with long traveling and strong accelerations the structure has the time to stabilize in between the movment, with very short traveling the machine is going into a factor called "structural resonance" and "inverted motion", what that mean? It mean that the axis is called to travel in a direction, but due to acceleration and mass involved the underneath structure is going in the opposite direction, and in a very small piece this factor is noticeable, even more when you are carving aluminium rather than wood, thats why the milling machines are heavy, especially CNC centers. Another thing to check is the connections between the motors and the ballscrews.... check all the mechanic parts first, as per very small pieces and high acceleration you are going to join another world with a high inversion rate, is called "jerk"
A router is a router, and as much as you like it, is shaking and flexible under high torque.....
I would suggest you to lower the acceleration to 300/500mm Min and look if the problem is persistent before retuning all the motors and blame them or the controller.

Regards

Machine is quite rigid, servos are more or less quite accurately calculated, so actually they are not over sized for the machine but exactly sized. I had some under and overshooting before, but i raised quite much the snappiness of it all.

I started now changing things here. I did that just before reading what you said, but more or less i deducted the same. I lowered panel response time to 1000, raised read lines / not shown here in manual/ to max 3600. Which i assume is the read ahead? and lowered interpolation time to 0.002 , which should give much tighter corners or will lower mechanical resolution? its not clear what they want to say. Just testing it now. If not ok 0.002 i will raise it to 0.01 to see what happens