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Type: Posts; User: Cal Haines

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  1. The exciter is designed to put out a constant 115...

    The exciter is designed to put out a constant 115 VDC at varying loads. The series field, in series (as the name implies) with the exciter's armature, increases the field and therefore the output of...
  2. Does that only happen at high RPMs? If so, it...

    Does that only happen at high RPMs? If so, it sounds like the exciter voltage is dropping enough that the contactor is opening. If it's now happening at all speeds, it's an issue with the hold in...
  3. I have information about flashing the exciter in...

    I have information about flashing the exciter in this thread: 10EE - No Exciter Voltage Give it a try if changing the brush timing doesn't increase the output. Might be some other brush issue as...
  4. I wouldn't expect the voltage to go down when you...

    I wouldn't expect the voltage to go down when you jumper around the resistor. You might check the field current.

    I assume that you checked the resistances of the windings.

    It's possible that...
  5. That's definitely not the original resistor. Take...

    That's definitely not the original resistor. Take it out of the circuit and see if the voltage improves.

    The problem starting at 2500 RPM is because your FA relay isn't working.

    Cal
  6. The "gearbox tumbler lock shaft", shown on parts...

    The "gearbox tumbler lock shaft", shown on parts picture E4-102, changed when the quick-change gearbox was redesigned to switch from the T-handle to the lever clutch. I think what you have is...
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    mmmmm, crow, tasty . . . :rolleyes5: Many...

    mmmmm, crow, tasty . . . :rolleyes5:

    Many thanks to my mentor, Bill (hitanmiss), for taking the time to straighten me out on this one.

    Sorry that I've been absent for a few days. I had a busy...
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    OK. I can see how the break in the rheostat would...

    OK. I can see how the break in the rheostat would cause the spindle to have problems coming up to speed. Once the rheostat hits the open spot, the spindle motor looses field and may not have enough...
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    What exactly do you mean by "generator bogging"?...

    What exactly do you mean by "generator bogging"? Was the motor/generator actually slowing down, or was the spindle just not coming up to speed?

    Cal
  10. Carl, I don't know why I didn't think of this...

    Carl,

    I don't know why I didn't think of this before, but you can use the large gear behind the dial to help pull it off. Make up a puller that fastens to the four tapped holes in the gear collar...
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    OK. This has nothing to do with brushes or...

    OK. This has nothing to do with brushes or relays, etc. Your Rotary Phase Converter (RPC) is the culprit. You may have a wiring issue between the RPC and the Motor/Generator (MG) terminal panel or a...
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    Member focusrsh has a cross-slide give that had a...

    Member focusrsh has a cross-slide give that had a chunk added to the end (unknown why). You might be able to do something similar:
    269836

    Cal
  13. The plate is pretty thin. The bottom of the...

    The plate is pretty thin. The bottom of the countersink is about where the plate ends. You need to make sure you get your picks in between the plate and the cast piece behind it. It's easy to get...
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    I don't have a CY, but that looks stock. I think...

    I don't have a CY, but that looks stock. I think the screw/pin on the perimeter of the large pin is called a "Dutch Pin" and you'll see them other places on Monarch lathes. I would think that what...
  15. He has a square-dial panel. So he needs a...

    He has a square-dial panel. So he needs a Cutler-Hammer bulletin #222 FA relay. The Struther-Dunn relay from a round-dial is not directly compatible. Works in a Drawer (WiaD) DC control panels also...
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    You'll have to e-mail them to me. PM sent. Do...

    You'll have to e-mail them to me. PM sent.

    Do the voltages sag when the spindle is started?

    It looks like the artificial (generated) phase is on L1. You can verify that by checking the voltages...
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    1945 was the very end of round-dial production;...

    1945 was the very end of round-dial production; as far as I know, the last round-dial was built in July of 1945. Every 1945 round-dial that I've seen thus far has had the same motor/generator set and...
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    You may have an issue with the FA relay, but...

    You may have an issue with the FA relay, but there's more to it than that. I've NEVER heard of a bad FA relay causing the MG set to slow down. Something is very wrong if that's going on. Assuming...
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    You say that "the generator slows down severely"....

    You say that "the generator slows down severely". That sounds like something is either overloading the output of the motor/generator (MG) or perhaps the way that the "115v variable DC power supply"...
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    If the RPC will start the machine on the 20A...

    If the RPC will start the machine on the 20A circuit, then it should be able to run at any speed. The motor/generator (MG) only draws about 12A at full power. The problem that you usually have with a...
  21. And in case it isn't obvious, you don't need to...

    And in case it isn't obvious, you don't need to remove the headstock to remove the quick-change gearbox.

    Cal
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    links: Van Norman #2...

    links:
    Van Norman #2
    Van Norman Duplex No 2 mill

    VN - Van Norman Parts Machine? | The Hobby-Machinist


    Here's a YouTube video of a No. 2 running:
    YouTube
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    If the saddle is still in place, maybe use blocks...

    If the saddle is still in place, maybe use blocks and raise the knee up to support the ram at maximum extension, then use the table's Y axis to drag the ram out enough to disengage it. Might need to...
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    I would need to see what's under the cover to...

    I would need to see what's under the cover to tell if you still have the original contactor. Other brands of contactors don't have the reset button(s) in that location.

    Cal
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    Hopefully you mean Mobile DTE Heavy-Medium or DTE...

    Hopefully you mean Mobile DTE Heavy-Medium or DTE Light. They also carry DTE 26 and DTE 24, which are hydraulic oils and NOT the correct lubricant; lots of confusion caused by the fact that DTE...
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