Sigma Vs. Superior on Gecko 202

[arriflex]

I've got a Superior motor on my X axis, and Sigmas on my Y and Z axis. Using a common 70v power supply, my Superior seems to run much smoother than my Sigmas do. Is this common? They are wired connected in parallel mode, but I was considering trying the Y axis in series and possibly half winding just to try and smooth out the steppiness at slow speeds. High speed is not of particular interest to me.
In the attached diagram, what do the little boxes with F and S on the right side of the Sigma pins represent?
I have seen a series diagram that has .8ohm resistors across pins 3-5, 6-1, 8-2, 4-7. But other descriptions of series wiring do not mention the resistors, anyone have any experience with both?

TIA, I'm really just trying to get the Sigmas to run as smooth as the Superior does. When drawing circles the top and bottom decel and accel generate quite a bit of table vibration when compared to the sides.

edgar

[keebler303]

do both motors have the same step angle?
do they have the same lead ballscrew?

If one is 2 steps=.001 and the other is 1 step=.001 then you would see a difference between the smoothness of them.

You will invariably have some "steppiness" in steppers because that is how they move. Microstepping will smooth things out if that is an option.

I don't know about your situation but those are some things that I would check.

Matt

[arriflex]

Both motors have the same stepping angle of 1.8deg or 200 steps per revolution. They are both being microstepped at 10x by Gecko 202 drives. They are both wired in parallel. I have also swapped the motor leads between the two drives with the same result, the Sigma is "steppier" at the slow speed where the Superior appears, well, superior!
The real question is wether or not an alternative wiring of the motor windings would improve...
edgar