7 MCM Parameters
7 - 25
MCM# 230~240 System Reserved
241. Denominator of Machine Resolution, X-axis.
242. Numerator of Machine Resolution, X-axis.
243. Denominator of Machine Resolution, Y-axis.
244. Numerator of Machine Resolution, Y-axis.
245. Denominator of Machine Resolution, Z-axis.
246. Numerator of Machine Resolution, Z-axis
247. Denominator of Machine Resolution, A-axis.
248. Numerator of Machine Resolution, A-axis
249. Denominator of Machine Resolution, B-axis.
250. Numerator of Machine Resolution, B-axis
251. Denominator of Machine Resolution, C-axis.
252. Numerator of Machine Resolution, C-axis
253. Denominator of Machine Resolution, U-axis.
254. Numerator of Machine Resolution, U-axis
255. Denominator of Machine Resolution, V-axis.
256. Numerator of Machine Resolution, V-axis
257. Denominator of Machine Resolution, W-axis.
258. Numerator of Machine Resolution, W-axis
Format . (Default=100)
Denominator (D) = pulses/rev for the encoder on motor.
Numerator (N) = pitch length (mm/rev) of the ball-screw.
Gear Ratio (GR) = Tooth No. on ball-screw / Tooth No. on motor.
Pulse Multiplication Factor (MF) = MCM #416~#469.
Ex1: X-axis as linear axis (MCM #781=0), pitch = 5 mm = 5000 m
Encoder = 2500 pulses, MCM #461 = 4, and GR = 5 (motor rotates 5 times
while ball-screw rotates once)
Machine resolution = 5000/(2500 × 4)/5 = 5000/50000 = 1/10 = 0.1
m/pulse
Therefore, the setting value for MCM #118 (D) and #119 (N) can be set as
or the same ratio of N/D such as. They are all correct.
(1) D=50000, N=5000 (2) D=10, N=1 (3) D=100, N=10
Ex2: Y-axis as rotating axis (MCM #782=1), Angle = 360.000 deg/circle
Encoder = 2500 pulses, MCM #161 = 4, and GR = 5 (motor rotates 5 times
while ball-screw rotates once)
Machine resolution = 360000/(2500 × 4)/5 = 360000/50000 = 36/5 =72/10
Machine Resolution =
(Pitch of Ball - screw)
(Encoder Pulse) * (MF)
*
1
GR
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