1.8 KW AC Servo For Spindle Motor

[suntravel]

I use the snubber circuit 5.jpg in this post:

https://centroidcncforum.com/viewtopic. ... uit#p46032

Easy to solder with the three parts.

The EMI-filter is ok for single phase lines ( in German L1 / N / Erde )

SSR I am using:
https://www.kaleja.com/fileadmin/user_u ... -30_de.pdf
Socket for the SSR:
https://www.findernet.com/en/worldwide/ ... mp-socket/

I get this stuff from CNC machines we are scrapping

Uwe

[RJS100]

Thanks Uwe. You are a fountain of knowledge!

[RJS100]

The 2.6Kw 10Nm JMC AC servo & driver arrived today. Just a quick question:

1. The JMC schematic (attached for convenience) shows the motor encoder cable connected to the CN2 connector on the servo driver. If I plan on doing rigid tapping, I would think the encoder cables from the servo would be need to be connected to the P10 (encoder connector) on the Acorn board. If no encoder is connected to the servo driver, do you need to program the drive to ignore the encoder input? Does the servo driver automatically ignore the encoder when it is working in speed mode?

2. My pulley ratio is 1:1.80. Does this present a problem for rigid tapping? In the past, I had a 1:1 relationship between spindle and encoder. 

Thanks... Richard

[suntravel]

You need a 1:1 encoder on the spindle, encoder from the servo could only be used for tapping if the servo drives the spindle 1:1

That is because CNC needs one Z signal each turn of the spindle

Uwe

[RJS100]

Thank you. I will keep the encoder that I already have that is picking connected directly to the spindle. I was hoping I could use the servo encoder.

As always... Thanks for your help!

[Black Forest]

Uwe, on your builds do you have an encoder in addition to the servo encoder when you have used a JMC servo for the spindle motor?

[suntravel]

Yes, otherwise it could not do rigid tapping.
This way it also works on my lathe with any gear from the gearbox.

Uwe