3 axis mill retrofit

[beezerlm]

Hello
I have a 3 axis machine with a junk anillam control. It has 3 SEM mt30m4-59 servo motors. http://www.sem.co.uk/files/brochure/MT30M4.pdf.

I called Gecko and they said they didn't have anything that could drive these motors to the full capacity. Does anybody know an affordable solution? My power supply is 115VDC.

I plan on using a CNC4PC c11 BOB and mach 3 to control this system.

Help is appreciated!

Brandon

[sandefuj]

Try www.LarkenCNC.com they have a 180 volt servo driver.

[beezerlm]

http://www.larkencnc.com/viper/v200.htmThanks! found it http://www.larkencnc.com/viper/v200.htm

Question: My motors have a 9.5v per 1000rpm tach. Can I use linear glass scales for position feedback and eliminate the tach?

[jeep534]

No you must replace the tac with encoders on the motrors or the machine will "hunt" and tear up the ball screws.

Happy Hunting
archie =) =) =)

http://www.larkencnc.com/viper/v200.htmThanks! found it http://www.larkencnc.com/viper/v200.htm

Question: My motors have a 9.5v per 1000rpm tach. Can I use linear glass scales for position feedback and eliminate the tach?

[sneakym8]

could try this http://www.rutex.com/us/home/index.htm

they do a 200v 40a drive , there is also a good pdf of how to match a drive to a motor.

good luck

[DennisCNC]

I'm no expert on Rutex but I haven't seen any posts by people running rutex drives. I have Viper 200 drives on my Bport mill and running good in the testing stage still working on the retrofit.

[jeep534]

I hear they are not as stout as they claim they are either. I plan to use the larkin drives as well on my boss retrofit (servo machine)

archie =) =) =)

I'm no expert on Rutex but I haven't seen any posts by people running rutex drives. I have Viper 200 drives on my Bport mill and running good in the testing stage still working on the retrofit.

[beezerlm]

purchased viper 200's and us digital 500cpr encoders. Talked to Larry at Larken and he told me to use a Breakout board that is not opto-isolated becase the drives are opto-isolated. He said it could hurt the timing on your setup. Can anybody elaborate on this?

[sneakym8]

I have heard the same thing about doubling up on opto's , The latest bob campbell combo breakout board ver 5 is not opto'ed on the step and dir. outputs .
The description on his site is of ver2 and say's it is opto'ed but the site is behind the times ,the boards that he is shipping is ver 5 and is not, he says he is going to update the site.

[beezerlm]

I have a CNC4PC C11 board and it is fully opto'ed. Any way to get around this issue?

[sneakym8]

I have a couple of the cnc4pc boards but i am not sure what version they are, but they are only opto-isolated on the inputs, the outputs are just buffered .

You may have a different version!!

[buff324]

Can you let us know how this turned out? I have the same servo motors and am trying to do the same conversion. Any part numbers for encoders or pictures would be appreciated! Thanks.