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Messages - ckirchen

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1
Galil / Re: Which servo amplifiers?
« on: July 12, 2009, 03:59:25 PM »
What type of VMC do you have..?
It's a 1983 Roku Roku MiniMac.

Have you thought of sticking with the Fanuc DC drives..they are very cheap to buy on Ebay these days and the Fanuc manuals are very in depth on how to set them up.
I've found them to be very reliable...
I am at the point where the machine just needs to be reliable.  It is 26 years old and in the 3 years that I've owned it, I've had more than my fair share of gremlins and downtime.  I have intermittent 401 alarms (among other random problems), which could be the drives, the wiring, the controller, etc. - I just want it to be reliable.  The machine is finally making some money and I cannot afford to have it randomly drop out.  By gutting everything, I can be sure that I get all of the gremlins.  Plus, the project will be a bunch of fun.

On the Fanuc system (I presume you have 6MB??) the encoders attach to a frequency to velocity circuit on the motherboard to give speed and position.

I'm fairly new to Mach..how will you set up the encoders, i'm asking as I have a Galil DMC 1880 that I would like to set up with Mach3 and the Fanuc yellow cap dc brush motors.
Yes, it is a 6MB.  I will be using Galil DMC-2153 controller (the extra axes for future projects, such as a rotary table) connected to three AMC BE25A20AC drives.  I haven't checked if the Fanuc encoders are 5V TTL style.  If not, I will retrofit some USDigital units on there.  It won't be the first time I grafted different servos onto a motor...

The project is on hold for the summer (too busy), but once I get started, I will begin a blog.

Thanks for the interest,
Chris

2
Galil / Re: Which servo amplifiers?
« on: June 27, 2009, 11:39:55 PM »
Yeah, I guess 350 µs makes much more sense than 350 ms.  I should have paid more attention while I read the sticky.

So, I talked to Galil and they recommended AMC because their drives max out at 500W.  AMC recommended their BE25A20AC ($539 list) and BE25A20I ($489 list) drives.  They are identical, except that the ...AC requires 130 VAC input, whereas the ...I requires 190VDC.  I think I might go with the ...AC to save me converting the machine's AC into DC.

We looked at a few digital drives, but they are approximately twice as much as similarly rated analog drives.

I have a question about the Galil.  It looks like I'm going to go with their DMC-21x3.  I would like to attach one of their digital I/O boards (DB-28040-5V) for the extra I/Os.  Can Mach3 make use of it?

Thanks again,
Chris

3
Galil / Re: Which servo amplifiers?
« on: June 20, 2009, 02:13:38 AM »
I should have mentioned that the motors are DC and their ratings are:
   Fanuc 5M - 9A peak, 151V, 2000 rpm, 2000 count encoder
   Fanuc 10M - 12A peak, 165V, 1500 rpm, 2000 count encoder

NosmoKing, I took a look at the AMC 100A25 drives; I think they are on their way out (their status is reserved).  I'll give them (and Galil) a call to see what they recommend.

Smurph, running one single Ethernet cable is going to be soooo much easier with my machine.  I should have thought of that, but I didn't; thank you for saving me that hassle of finding that out by myself.

I read the sticky that you posted about "Galil controller compatability" and you mention that the Econo controllers have a 350 ms delay over the Accelera controllers (because the Econo has to convert the commands from ASCII to binary).  How does this affect the overall performance?  Does everything happen just as fast, except that there is a 350 ms between when Mach starts sending the program and when the Galil starts sending signals to the drive? Or does each command sent to the Galil take 350ms to be interpreted?  I'm guessing that it's not the latter, but I figured I would ask.  Is the extra cost of the Accelera worth it?

Thanks again,
Chris

4
Galil / Which servo amplifiers?
« on: June 18, 2009, 04:38:00 PM »
I'm in the planning stages of a retrofit for my 25 year old VMC (the only unreliable machine in my shop).  It is equipped with Fanuc parts and I plan on removing everything electrical, except for the servo motors (Fanuc 'Yellow Cap' 5M (X and Y axes) and 10M (Z axis)). 

I don't want to reuse the drives because I have had some issues with them.

I am planning to use a Galil 18x6 controller with the Mach3 + Galil plugin.  From the Galil manual, it looks like the 18x6 will only output ±10VDC to the servo amplifier.  Is that the only option I have?  I see that the 18x6 will also control steppers with 5V step/dir output; can I output 5V step/dir to control a servo amplifier (such as Rutex or Viper)?

Alternatively, does anyone know of any off-the-shelf ±10VDC servo drives I could use?

Thanks in advance,
Chris Kirchen

5
Competitions / Re: ******Guess and win a G100 Grex******
« on: May 17, 2007, 05:33:16 AM »
two million + stone cold + a magnum = 2,316,357

2,070,680

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