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Offline DMBGO

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Servo Motor question
« on: March 01, 2011, 03:19:28 AM »
Hi I am looking at buying a mill which is already a cnc mill, it had the option of a built in Chinese CNC controller, but I asked them to quote the mill with just the servos and drives.

The Servos are AC servos, and I am wondering if there would be any difficulty interfacing them with Mach3.
Here is a link to the manual for the servo drives

http://www.gskcnc.com/Support/DA98A_ACDriver.pdf

I have had a lot of experience in the past with steppers, but servos are a whole new ball game to me.

Thanks
Dave
Cheers

David

Offline Hood

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Re: Servo Motor question
« Reply #1 on: March 01, 2011, 03:42:24 AM »
They will work fine with Mach but you may need to make up a line driver to change the single ended Step/Dir signals into differential signals. Some drives can accept single ended but I would recommend you use the differential  even if they can. It is easy enough to make up a line driver or you can buy them.
Hood

Offline Hood

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Re: Servo Motor question
« Reply #2 on: March 01, 2011, 04:14:52 AM »
Just looked through the manual and they can accept single ended Step/Dir signals but as said best use the differential and the manual also says that.
Hood

Offline DMBGO

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Re: Servo Motor question
« Reply #3 on: March 01, 2011, 04:40:21 AM »
Thanks for that Hood, It's been a while! Sorry for being lazy and asking, I should have done my homework, but I needed to get back to the guy quickly.

Thanks again

Dave
Cheers

David

Offline Hood

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Re: Servo Motor question
« Reply #4 on: March 01, 2011, 04:55:08 AM »
No problem, One thing however will be  you will either have to use electronic gearing in the drive (I would think it has that) or use something like the SmoothStepper that can pulse a lot faster and cleaner than the PP.
Hood

Edit, just checked and it does have electronic gearing if you choose to go that route, personally I dont like it but others seem to find it ok.

Offline DMBGO

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Re: Servo Motor question
« Reply #5 on: March 01, 2011, 05:55:10 AM »
I intend to use the smoothstepper with it, here's the machine btw

I'm also looking at the VM760

Any comments would be appreciated


Cheers
Dave

Cheers

David

Offline Hood

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Re: Servo Motor question
« Reply #6 on: March 01, 2011, 06:31:51 AM »
No contest for me, it would be the VM760, next choice would be the bedmill and last would be the turret/knee.

One thing I would say is the quill dia on the knee mill is too small to get the benefits that a 40 taper gives, the bedmill is better in that respect but the swivelling head would still put me off.

Suppose it depends on the type of work you will be doing. Big long stuff may be a PITA on a fully enclosed machine, then again removing of tin work likely wouldnt be too much of a problem if it was needed.
Hood

Offline DMBGO

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Re: Servo Motor question
« Reply #7 on: March 01, 2011, 04:15:57 PM »
The VM760 is what I am leaning towards too, It is quite modular in that you can buy anything from the base machine without motors ATC etc upwards.
Cheers

David

Offline Hood

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Re: Servo Motor question
« Reply #8 on: March 01, 2011, 04:58:54 PM »
Sounds like it is a decent machine, what kind of price are you talking?
Hood

Offline DMBGO

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Re: Servo Motor question
« Reply #9 on: March 01, 2011, 05:02:32 PM »
Base machine FRAME   $12,992.00
BT40 spindle speed 10000rpm extra   $179.00
4. Armless(Genoa) type 10 tools ATC       $1,456.00
10. Spindle motor 7.5hp (10000rpm, inverter motor   $1,064.00
12. Inverter driver 7.5hp/220V (VFD055V23A-2/Delta   $1,064.00
15. X,Y,Z with brake AC servo motor 220V/1kw   $980.00
18. Oil mist lubrication pump   $448.00
23. Remote handwheel   $280.00
Fumigation fee   $100.00
24. Limit switches (3 pcs)   $252.00
25. Interlock switch for front door   $224.00
26. Air gun   $34.00
27. Coolant gun   $34.00
20. Heat exchanger for electrical box   $134.00
21. Electrical fan for electrical box (1pcs)   $22.00
Cheers

David