How to Rewire DC Servo Motor on Vintage Lee Faceting Machine for Banana Plug Connection

Hi-  I am sure this is a overly simple question for everyone on this site.  But all of my inquires elsewhere have come up empty!  I have a Lee faceting machine (for cutting gemstones).  It was hand built by Lee in the 70's and 80's.  I lost the plug that converted the wire coming our to the DC servo motor to two single pole banana connectors ( I think that is what they are called.  I do not remember the old cord having a spring, just smooth barrels that plugged into my power supply/rectifier.)  Can anyone help me figure out how to rewire this thing?  See pictures below.  I apologize if I have not given enough information, or the wrong info.  I am such a novice I do not know where to start!

Hi Nicole-That connector is a Cinch-Jones P-304CCT.  A little history here- That connector style is really old, and today these are mostly obsolete.  They were more recently called "Jones" connectors, then the company that made them was acquired by Molex, and then it was re-acquired by Beau, who finally discontinued the connectors.You can find some HERE on eBay, but in my opinion the asking price is absurd.  We may have some in a junkbox at my office.  I'll check on Monday. Another option is to find a nearby Hamfest (a meeting of Amateur Radio Operators), and you can probably pick one up for a dollar- along with the banana plugs for the other end of the wire.I am a little concerned that since it is labeled "servo motor" that there is a controller that is supposed to go with it.  Do you remember another box being connected to the missing wire?-Rick .

Nicole,I agree with Rick that the asking price on eBay is absurd.
Another option that might work for you is to remove that connector and replace it with something more modern. If the only thing  that you need to connect to is the power supply, you could possibly just attach the banana plugs to the end although that would probably make the connection to the power supply too short.I'd suggest that contact a local ham radio club. It's likely that someone there could help you replace that connector and/or make you a new cable. Probably for not much more than the cost of the parts.
Elizabeth

You write that the missing cable ended in two single-pole plugs. This raises the question of what the third and fourth pins on the Jones plug are for. The cable into the Jones plug looks like a black multi-conductor cable plus an orange single-conductor wire. Is the single conductor connected to the metal case of the motor?
I see on the bottom of the motor a black ring with two bulges on opposite sides. These might be brush holders, in which case the motor is a DC motor. If the motor manufacturer still exists, you could ask them to send you the specifications for the motor.Is the power supply in the photo the one you use for the motor? Does the power supply permit adjusting the motor's speed? If so, this would be consistent with a DC motor. I have a small milling machine which uses a DC motor for variable-speed drive, so I am a little familiar.If you swap the leads to the motor, this will reverse the motor's direction. When first trying your new homemade cable, be sure that reversed direction will not damage your machine.
To disassemble the Jones plug, loosen the two screws on the cable clamp at the rear of the plug. Then find what looks like a rivet-head on one side of the housing and what looks like a small round pin sticking out of the other side of the housing. Push the pin in, and the rivet-head will lift out a little. Pull the rivet-head and pin out with pliers to free the housing to slide up the cable.

Nicole, in my youth as a radio tech we used to use these plugs on all manner of radio gear.  They are good quality plugs.  I see Electro-Craft are still going, their web site is here, and they have a form you can fill to contact them, it would be worth contacting them to see if they still have information on that model motor (I'd have done so but the model number is not clearly visible).I too may have some sockets for those plugs lying around, I'll have a dig, and if Rick does not have any and I do, I'll send you one.  Don't hold your breath though.....

Looking again at the photo, the motor's label says "D.C. SERVO MOTOR", so you have a DC motor, almost certainly a permanent-magnet (PM) DC motor. Also, the brush holders are visible at the bottom of the motor, so this is a brushed DC motor.
https://en.wikipedia.org/wiki/Brushed_DC_electric_motor will tell you more than you want to know about these motors. The speed depends upon the applied voltage, and swapping the wires reverses the direction of rotation.
Nicole, do you have experience soldering? I ask because if you obtain a mating Jones connector, you will have to solder wires to the contacts.Looking at the power supply, I see three output connectors (which banana plugs plug into): red for output positive wire, green for output negative wire, and black for ground wire. The output connectors may be binding posts: If so, you can unscrew the plastic part, slip a bare wire through the small sideways hole in the threaded metal core, and screw the plastic part back down to make the connection. If your motor cable is long enough, you would not need a connector at all.I also notice part of the Jones plug cable clamp lying loose with a wire soldered to it, with the wire going into the Jones plug. This wire is probably connected to the ground wire and ground pin of the Jones plug.

I wanted to thank everyone for your help!  I have got my machine all wired up and thanks to you all I am back in business.