Hi Kevin
I used M12 on my Lionclaw router when I first built it, the length of the M12 leadscrew was 1750mm so it generated some hectic whip, max speed with the M12 rod was 16mm/sec.I also tried to use HDPE nuts with a spring in between the two but this made the nut very stiff.I eventually upgraded to 12mm trapezoidal spindle and used a homemade delrin nut that was tapped using a offcut of the trapezoidal spindle that was modified into a tap.The trapezoidal spindle works very well, the one I got has a 3mm pitch pitch helped me douple my speeds to 35mm/sec.Marchant Dice in the UK has a wide range of trapezoidal spindle.My machine has a tolerance of about +-0.2mm over 100mm so the trapezoidal spindle is accurate.You could use M12 threaded rod for the Z axis, im still using it for my Z axis and have no problems due to the short length of 400mm
I am using a hobbycnc board and their 2.15Nm(305oz/in) steppers so your 1.85Nm(262oz/in) steppers should work well.
Good luck with your build. |