Re: [CAD_CAM_EDM_DRO]DC motor

Hi Jon and all:
     The Monarch 10 EE I know a little about as my brother has one with the original drive in it.  The one his friend owns has a newer drive in it that he developed himself.
     I will not be able to get to the control or the special control box (about2' wide 4' height and 1' deep) till Monday as they our in a local shop about 6 miles from where I live.  I did look inside the control box and it had some different relays in the bottom part and three power units in the top.  This was before I found out the motor was a DC motor.  The headstock of the lathe has all the gearing to run from 32 RPM to 1800 RPM with a single speed motor.  What my thoughts were is to use the high low range gear and just pause the program to shift.  If I do this the motor would not have to go as slow to to the threading operation I figure on doing.
    Jon, as you may not know from my email about a month ago, This lathe is a NOS 1984 vintage Cadillac NC lathe made in Taiwan with a General Numeric System tape control.  The former owner was an electrical engineer and he was in the process of converting it over to a CNC lathe.  He had put two computers, each with a special board and connector, to two NC lathes just like this one.  He then was drip feeding the NC control from the computer.  They worked OK for the turning they were doing as all the work was close to one size with no threading. 
    What I am wondering about now is how to get the motor up and running at some speed so that I can just start to check some of the other systems out.  Then after I have the basic lathe running I can start to work out the NC control system and the changes he made before I get into the drive motor control.  Thanks for all your time and help.  I didn't get to see you at NAMES this year.  Are you coming to the CNC Workshop in Ann Arbor?
                                                                                                  GOD'S BLESSINGS
                                                                                                          Bill T.

On Fri, 14 May 2010 19:55:58 -0500, Jon Elson wrote

>  
>
> William Thomas wrote:
> > Hi All:
> > THANKS JON for the update. I am not an EMC man so I didn't know it would do this. That Would be a good way to go. While I have you attention what do you know about DC drive motors? I just found out the 10 HP motor in the lathe I purchased last month has a DC varispeed drive motor in it. That is why it has a separate cooling fan beside it. I have another motor control panel I need to check out first before I can as questions. Need to know all about what I have. (two pick up loads of electrical stuff)
> >
> The Monarch 10EE had a pretty famous DC electrical varispeed drive. To
> do this right, you needed a VERY oversize motor so you get enough torque
> at the low speed end, without the benefit of gear reduction. There were
> a couple versions, one used a motor-generator set, the later used
> thyratron tubes. Both, I think, also used field weakening control of
> the motor.
>
> So, is this a Monarch, or other make?
>
> I do know a fair bit about big motor drives, but don't make anything
> over 2 Hp myself. A commercial 10 Hp drive will cost quite a bunch,
> new. You may have a serviceable drive in your 2 truckloads, or may be
> able to find something on eBay in that size range.
> > Is anyone still using punched tape? I found a brand new tape reader sealed in plastic wrap in the original box.
> >
> I'm sure there are people who still use them, but really, VERY out of
> date. Some of the "bit savers" crowd who are archiving ancient computer
> programs might be interested in the reader.
>
> Jon
>
>

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