Messages

131

General Mach Discussion / Re: Is the motor diameter more important than voltage?

« on: April 29, 2011, 07:59:40 AM »

I dont know a lot about DC servos but that all sounds like crap to me

That's what  I was thinking.  But, with my lack of experience, and being new to this stuff, anything is possible. This could have been one of those weird exceptions that just didn't make sense.

 I agree with tweakie on the flywheel effect and inertia. My concern was how they told me  physical size  was more critical than what the ratings that are  on the motor tag.

Thanks a lot guys,

JAckal

132

General Mach Discussion / Re: Power supply question

« on: April 29, 2011, 07:52:19 AM »

Hood,

I haven't looked at them. I keep forgetting about that drive.

Thanks,
JAckal

133

General Mach Discussion / Is the motor diameter more important than voltage?

« on: April 28, 2011, 05:11:15 PM »

I am looking at other drives becasue the Dugong is not available right now and is back-ordered.

One of the other manufacturers just told me that I needed a larger and more expensive drive because the diameter of the motor is the criteria for the drive, not the rated current.

This is something I am not familiar with.  My servo motors are right under  maximum for their drive.  According  to their specification manual  their driver can handle more than a  20%  over-voltage.

This is confusing. Can someone line me out on this?

Thanks,
JAckal

134

General Mach Discussion / Re: Power supply question

« on: April 26, 2011, 01:15:03 PM »

How would that affect  the performance? The servos are rated at 90vdc and I am running 85vdc.  If It was cut in half that would leave 42.42vdc.

Thanks,
JAckal

135

General Mach Discussion / Re: Power supply question

« on: April 26, 2011, 09:36:48 AM »

Thanks Ostie.

For the amount in savings on the drives would it be feasible to buy/build a new power source?
Would the 5+ volts really make that big of a difference of the performance on the servos?

Thanks,
JAckal

136

General Mach Discussion / Power supply question

« on: April 25, 2011, 09:32:52 PM »

 Hello,

I am having trouble with the availability of the Dugong drives. Mine have been on order since March, but they do have the Whales in stock.

The power supply transformer in my Hurco now is  60 volts x ( 1.414 bridge rectifier) = 84.84 volts output.

The servo motors are 90VDC, 20A peak & 12A continuous.


Dugong drives are 160v & 35A.

The Whales are 80v & 20A.

Is there any way I could drop my power  supply down a few volts and use the Whales?

Or, do I really need the Dugongs because of the servos  increasing the current  during  coast down?

There is a braking resistor they have specifically  for the Whale & Dugong.

This is just a thought I'm knocking around to get my retro started. I would like to get the dirty work out of the way  before the weather starts getting too hot.

Plus the Whales are $70 each cheaper than the Dugongs.

Thanks in advance ,
JAckal

137

General Mach Discussion / Re: Are these Litton encoders ok to re-use?

« on: April 19, 2011, 10:45:08 PM »

I guess that worked. I've never posted pics on this board before.

JAckal

138

General Mach Discussion / Re: Are these Litton encoders ok to re-use?

« on: April 19, 2011, 10:40:17 PM »

Here is a link to my imageshack pics:


http://img199.imageshack.us/g/littonencodernameplate2.jpg/

JAckal

139

General Mach Discussion / Are these Litton encoders ok to re-use?

« on: April 19, 2011, 10:38:19 PM »

Ia a tearing into my Hurco and it is gutted in the drive side cabinet. After taking the covers off of the encoders, they don't look too bad. I was expecting oil contamination and maybe some dust/shavings, etc. They are super clean.

MY first intent was to install new encoders. Eliminate any old bad parts that might fail or have problems now when at operating temperature.

 Would these old ones be sufficient with  the Dugong drives and Mach 3?

Would it be better to trash these and not look back?


Thanks for the info.

JAckal

140

General Mach Discussion / Re: Pendant Settings and Brains

« on: April 07, 2011, 03:35:22 PM »

You are plugging the Pendant into the parallel port on the computer, correct?

I was planning on connecting it to my c32 board like this link here shows:


http://cnc4pc.com/Tech_Docs/C32R1_Product_Integration.pdf




You might check with Art at CNC4PC. Yours could be an earlier edition, and  will only connect the way you have it.



Hope this helps,

JAckal