Grizzly G4003G conversion

[Digger873]

Hey guys,
Im working on my latest project, converting my manual lathe to cnc. My first obstacle is what to use for a spindle motor.
Ive been looking at all the choices, 3 phase with vfd, AC servo, and this, https://www.servomotorkit.com/product-p ... or-upgrade.
This seems like exactly what I want with a controller that can be controlled with the acorn, brake, reverse ect.
The only thing is its 120 volt not 220 and I think it will work great, it will bolt right on to my lathe.
I know 220 v would be better, Ie draw less amps, run cooler, but is there something Im not thinking about that would keep it from being a good choice.
Any thoughts?
Thanks
Jared

[Gary Campbell]

Not just 230v, but 230v 3 phase, with a vfd that will accept single phase input. The only way to go, and usually less than a servo

[Digger873]

I would agree with the 3 phase and vfd normally being cheaper, however not in this case. The link is to a servo motor with a controler and timing gears and belt for $444.00 that will bolt right up to my machine. I dont think I can beat that price, unless I buy the cheapest chinese motor I can find, and then do the work of making it fit my machine.
Jared

[suntravel]

I would agree with the 3 phase and vfd normally being cheaper, however not in this case. The link is to a servo motor with a controler and timing gears and belt for $444.00 that will bolt right up to my machine. I dont think I can beat that price, unless I buy the cheapest chinese motor I can find, and then do the work of making it fit my machine.
Jared

This is a servo for a sewing machine, without the bolt on parts 100$ on Ali...

Uwe

[Digger873]

Does that mean it wont work, or I shouldnt use it?

[suntravel]

They work, there are lot of low buck conversions with these, but I think 340$ for the other parts is too much.

I would use a JMC or Leadshine servo and make the adaption my self.

Uwe

[Digger873]

Yeah I understand, however leadshine in the us, for a comparable size starts at 600 and JMC doesnt have a US dealer. Im a little apprehensive about import taxes, I went to Ali and that size motor was about 250 + shipping and taxes, had everything written in chinese ( which I cant read),and had to wait 10 days, if it doesnt get held up in customs. I did find out though that I can get that sewing machine motor in 220 from this guy.
Do you think it would be a bad choice?
Thanks
Jared

[suntravel]

I do not think the driver accepts 0-10V for rpm control from Acorn.
A CNC with only spindle on/off is not the best idea.
Also, If you want to use rigid tapping, feed/rev an encoder 1:1 on the spindle is required.
For the size of this lathe, a 1500W AC Servo with 0-3000 rpm would be a better choice.

Uwe

[Digger873]

Hey Guys, been away for a while, been a crazy busy summer and am just finishing building my sons house and starting on building mine.
I have had to put the cnc project on hold, but had purchased a no name AC servo for a spindle motor. Now I am still unable to continue just yet with the cnc conversion but my lathe motor took a crap on me, and I really need to get it running. In wiring it up, I need to be able to use the manual switches for now, ie forward, reverse e stop. My driver will accept analog 0/10 volts, but I have been unable to find anything on how to achieve this without a pc/bob.
Can anyone point me in the right direction please. This is a link to the motor and driver I have,
https://www.ebay.com/itm/224673703781?
Thanks in advance
Jared

[centroid467]

According to the manual posted here: viewtopic.php?p=91186#p91186

These drivers can have the speed adjusted from the front panel in velocity jog mode. You could also use a potentiometer and an external 10VDC power supply into pins 25 and 13 on CN2. I don't know how you would reverse it without going to -10V though. Since you are going to be using it manual for a while anyway, I suggest the following:

Direction control could be possible using the "Internal speed command select" inputs as described in the Port Function Details beginning on pdf page 149. If you are going to be using the lathe's gearing for speed control then I would suggest using two of the "Internal speed command select" inputs with the speed set equal to the speed of the old spindle motor using Pn169 and Pn170. Use Pn169 for positive and use Pn170 for negative. Use another input on the drive for S-ON (servo enable). Then you can wire switches to them and have it working the same as before.

Since SigIn1 (CN2 pin 6) is set to Servo enable and SigIn2 (CN2 pin 7) is set to Alarm reset by default, I would probably set SigIn3 and SigIn4 to Internal speed command select 1 and 2. SigIn3 is CN2 pin 21 and SigIn4 is CN2 pin 8.