I used normal M12 threaded rod with a homemade HDPE 20mm thick nut on the Z axis and TR12 trapezoidal spindle on the X and Y with homemade 30mm thick delrin nuts.Also try not to use leadscrews that have too fine a pitch as they will be slow, the trapezoidal spindle I use has a 3mm pitch with a single start I think Marchant Dice stocks a two start 12mm dia trapezoidal spindle which has a pitch of 6mm this will give you faster rapid speeds will reducing rpm on the leadscrew thereby reducing whip.
Hope that helps |