Hello. I'm building a 3D ABS Printer using 10mm Ball screws with a 4mm pitch. I need a travel speed of 60mm/s. I have the nut and screw mate set up for 1rev/4mm. When I drive the shaft using a rotary motor in basic motion everything works great up to 240 rpms at that point the nut reverses direction and the screw moves the wrong distance. to achieve 60mm/s I need the motor to go 900 rpm. Am I exceeding some limitation? The rpm limit appears to be 10000rpm from what I've read. I'm using SW 2013. I attached the file of my setup.