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  1. Replies
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    817

    Fast thought on it is if the 3-6 were backward...

    Fast thought on it is if the 3-6 were backward and all the windings connected, that would set two windings bucking each other, and at the least, torque would be poor, as in very bad, with nearly...
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    1,293

    Yeah, after "getting it", and seeing the...

    Yeah, after "getting it", and seeing the video..... That red roo sharpener is an angle grinder attached into a sheet metal box. After the 2 kilo weight, and the adder weight, OK, OK, this is some...
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    309

    The only motor that you can figure is decently...

    The only motor that you can figure is decently accurate on mount vs shaft is a C-face type having a locating ring machined-in....(I think there is a designation for that, dunno) All others are going...
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    Not necessarily. Check the invoice and their...

    Not necessarily.

    Check the invoice and their shipping policy. Look carefully for the "magic words", which are something on the order of "orders shipped FOB our facility".

    When you agree to buy...
  5. Replies
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    1,630

    I've had epoxy in some gouges in a lathe bed for...

    I've had epoxy in some gouges in a lathe bed for probably 10 years, and nothing has let go yet. It was not any special type, just an ordinary hardware store clear epoxy, IIRC.

    Clean the crap out...
  6. This is a case where posting the schematic would...

    This is a case where posting the schematic would be helpful.

    It seems a bit goofy, if I were doing the thing, I would be tempted to do the regulation on the primary side, which would take care...
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    1,630

    If you have actual pits, and not just areas that...

    If you have actual pits, and not just areas that are worm=n low, then filling with epoxy is good.

    The idea is not to build up a way surface, but rather to fill up the pits with something that is...
  8. Replies
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    1,296

    The original plan, since the germans were not...

    The original plan, since the germans were not stupid, and understood the V1 was vulnerable, was to send them over in huge lots simultaneously. That way good numbers would get through. It basically...
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    1,010

    The thing about that summing circuit is that you...

    The thing about that summing circuit is that you can do all the summing from unbalanced inputs (one side grounded), because sum, difference, etc can be done in the circuit instead of via connections...
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    That is quite a decent idea. And doing that...

    That is quite a decent idea. And doing that would potentially allow using buffers on the input if that is still needed.

    This assumes the input network is reasonably simple and can be changed in...
  11. Replies
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    1,010

    It sounds as if the coil type sensors are...

    It sounds as if the coil type sensors are ungrounded because they are being connected in the "various ways" that would not work right as op-amp outputs.

    In that case, can you "break into" the...
  12. Replies
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    2,370

    There is the direct "too fast" where the "on"...

    There is the direct "too fast" where the "on" time is too short as you describe.

    The "speed" of switching can mean the actual speed of the switching event, or it can mean the number of times per...
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    1,010

    The simplest method would be to use an opamp on...

    The simplest method would be to use an opamp on each input, with the gain set at unity gain, and then use the outputs of those, which will be quite low impedance, as the input to your network.
    ...
  14. Replies
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    2,370

    And that is an example of the insulation...

    And that is an example of the insulation placement difference. High voltage spikes create corona voltages in susceptible spots, and that gradually breaks down insulation. Eventually something goes...
  15. Replies
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    2,370

    That's the full deal.... takes away all the...

    That's the full deal.... takes away all the noise, and lets through pretty nuch only the sine wave 60(50) Hz. Does not get any better than that

    Those can confuse anything past a regular V/hz...
  16. Engineering is generally closed just to keep new...

    Engineering is generally closed just to keep new items secret. Auto companies have a lot to keep secret from competitors. Iknow I could pick up a lot of data if I went on a tour that was supposed...
  17. Motor impedance, composed of inductance and...

    Motor impedance, composed of inductance and resistance, limits turn-on surge. A motor with a low impedance will have a hellacious turn-on surge,potentially damaging to the motor. But, a low...
  18. Replies
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    2,370

    Close... The inductor, assuming its value is...

    Close...

    The inductor, assuming its value is reasonable compared to the motor inductance, will simply "block" much of the high frequencies. That tends to reduce the peak voltage of the...
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    We should mention that longer parts may need a...

    We should mention that longer parts may need a "traveling steady" that holds the work and prevents it from pushing away from the tool as much. The work is part of the "structure" as much as the...
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    487

    A couple added comments. The crosslide or...

    A couple added comments.

    The crosslide or compound indeed could be moving side to side, which is "usually" a gib (jib) adjustment. A row of screws along the side adjusts this.

    Problem is that...
  21. Replies
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    2,370

    The insulation placement on old motors is often...

    The insulation placement on old motors is often better than on newer ones. That usually offsets the margin provided by better insulation types on newer motors, vs the varnished paper or cloth in...
  22. Th point of secondary side grounding has almost...

    Th point of secondary side grounding has almost zero to do with fault currents from shorts to ground on the secondary.... An ungrounded secondary has NO fault current with a single point ground,...
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    A couple things. Bring the ground and not the...

    A couple things.

    Bring the ground and not the neutral. The ground is not supposed to have enything flowing in it other than fault currents. Neutral has other current in it.

    The neutral is...
  24. Replies
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    The motor switch really needs to be rated for the...

    The motor switch really needs to be rated for the motor HP (for what it controls). That will take care of switching off with locked rotor current flowing, etc. Motor controls are generally HP...
  25. Concur that a repair is unlikely to work. That...

    Concur that a repair is unlikely to work.

    That part is really pretty heavily stressed. I have a Lambert, which originally had a square socket in the crank, fitting a square end on the bottom...
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