Hi ! I'm trying to try what this stepper can. I'm new with steppers. So, about 23HY56-25-4A stepper there not much info http://www.ms-motor.com/product_detail-30-en.html . When trying maximum speed, aproximately i have about 1.5 rotations per second, what is 90RPM. Can't find manufacturer RPM... I think it should be much higher RPM. I'm running it with atmega and l293d. Maybe you guys know more about that type stepper. Thanks !