Recently, I bought a new ZAY7045 from a company insolvency.
The goal is to convert it to CNC, to make some hobby parts for myself and friends (Historical car racing)
I played with the live simulation in Linux EMC2, the other parts, I think of buying them at homeshopcnc.com
-Servo Z axis 850 oz/in 4200 rpm with 1/5 or 1/10 ratio, motor placed behind the column.
-Servo Y axis 850 oz/in 4200rpm with 1/1 ratio, motor placed under the machine and Yaxis.
-2 nema23 Servo's X axis 350 oz/in, 4700rpm, one right, one left, placed in front of the table, with a belt, ratio 1/1, with a cover over them.
Only 1 encoder used, DC motors in parallel. Two nema23 here instead of one nema34 gives me more place and will make the front servo cover smaller.
The servo motors will not be visible, the machine won't become larger, placing the X servos in front instead of behind the table nowhere limits X/Y movement.
The XY spindle ratio is 3mm/rotation, so 500 IPM is possible.
With the 250 lines encoder, I will need a 70kHz processor.
Z spindle ratio is 2.5mm/rotation.
I looked at the new Gecko G320X, with the pulse multiplier (1/10) I only will need 7kHz, this is no problem for EMC2 under Linux.
At 7kHz, the accuracy will be 0.03mm at 4200rpm (1/10) 500IPM or 0.003 at 420rpm (1/1) 50IPM. Good enough for me.
I measured the Backlash on X and Y. It's 0.2 mm. I won't be replacing the spindles at the first moment. Does backlash compensation on EMC2 work good?
Comments and remarks are welcome !