HY-TB3DV-N, nema 24 RPM problem

[valdas_a]

I have made 1.2 m x 0.5 m x 0.3 m cnc, for driver i am using HY-TB3DV-N and nema 24 type motors i cant get exact number at the moment 42BYGH47-402 i think, i cant remember last number if its 2 or 4 but anyways. Motors are connected directly to acme screw 6mm and microsteping is set 1/1 so for 1 mm i need 160 steps. Everything looks ok but speed of motors is horrible. I cant get past 160 mm/min feed rate. If i make it faster motor stalls and just buzzing... Same thing if motor is not attached to screw and turning freely. On internet i seen those motors going 10 times that speed... I would be glad if i could get them going 3 times current speed. Because i am just burning wood at the moment. Oh pc is celeron 1.8 ghz, software windows xp and mach3. I tried all jumper settings on driver nothing helped. Any ideas?