kencor1,
"speed 70ipm they run fine I can try to hold on the the axis and the motors will not miss a beat, but when I am rapiding and 150ipm I just barely touch the axis the motors will bind"
Just a general comment on what you said above for info.
In general as a steppers speed increases the torque decreases as shown in the example attached. I couldn't find any info on the V90 site for a motor curve ( gave info on motor wiring but no torque to speed curve). This seems typical these days for a lot of the generic hybred motors which are sold today. Don't get me wrong, great motors at a nice price but you just don't know in advance how they will behave over a range of speeds. All motors have DIFFERENT curves depending how they are wired ( series, parallel, unipolar ) ie; it's a comprimize on how fast you want to go and how much power you will have at that motor speed. Additionaly, if you ask for a motor curve the seller never seems to be able to provide one or gives some
general info which is useless and not meaningfull. Again not knocking the V90, just some general info on steppers which may be of value to you.
RICHÂ