Problem Calibrating RAMPS 1.4 (3 replies)

Hi. I'm rebuilding my old Makerbot Cupcake. I've replaced the old-n-busted with RAMPS 1.4 and an E3D v6 hot end.

I'm using the Repetier Host (on a Win Vista box) and the 0.91 Rev 8 firmware on my RAMPS.

I've tried following Triffid Hunter's guides for calibration here: http://reprap.org/wiki/Triffid_Hunter%27s_Calibration_Guide

But I've not been able to get the X, Y and Z to move the distances that I'm requesting them to, using the manual controls in Repetier Host.

X & Y move 42mm when I ask for 50mm. Z moves a mere 0.5mm when I request 10mm! Can someone please have a look at my calculations and let me know where I've goofed?

X & Y Axis Stepper Motor Resolution Calculation
steps_per_mm = (motor_steps_per_rev * driver_microstep) / (belt_pitch * pulley_number_of_teeth)

motor steps / rev: 200 (step angle 1.8°)
driver microstep: 16
belt pitch: 2 (mm between teeth)
pulley number of teeth: 17

steps / mm = (200 * 16) / (2 * 17)
steps / mm = 3200 / 34
x/y-steps / mm = 94.1176


Z Axis Stepper Motor Resolution Calculation
steps_per_mm = (motor_steps_per_rev * driver_microstep) / thread_pitch

motor steps / rev: 200 (step angle 1.8°)
driver microstep: 16
thread pitch: 0.9 mm / rev

steps / mm = (200 * 16) / 0.9
steps / mm = 3200 / 0.9
z-steps / mm = 3555.556

Thank you. :)

-[a]-