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Type: Posts; User: JST

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  1. Replies
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    Power company 3 phase is quite stable in voltage....

    Power company 3 phase is quite stable in voltage. Powerco has to keep it in tight regulation, 10% high is max, and most want to keep it under 6% high. For you, maximum is 264VAC on 240VAC.
    ...
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    351

    Probably the static type, which for that company...

    Probably the static type, which for that company seems to be one involving a transformer and capacitors. Possibly the Steelman method?

    Anyhow, those may not produce the correct voltage unless...
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    The transformers are drawing kVA at a lousy power...

    The transformers are drawing kVA at a lousy power factor, possibly as low as 0.1, because there is a lot of VA and likely not much wattage. It is the "magnetizing current" and since it is flowing...
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    I have a drill-driver that sometimes smokes from...

    I have a drill-driver that sometimes smokes from the brush area when starting or under heavy load. It's not new, but is in nearly new condition, since it was an unused backup unit for 12 years or...
  5. Here is the anvil adjustment. Notice that...

    Here is the anvil adjustment.

    Notice that the size of the unit would put your fingers pretty close to the hot metal if used as a check on the rolling mill line. Not at all handy with gloves on....
  6. Already did remove and take a look. COLUMB is...

    Already did remove and take a look. COLUMB is what is stamped, and after that spaces and then a "5" or "S", etc. Other than that, what you see in the pic is what I see also.

    I suppose nothing...
  7. what is with the reverse reading dial? That...

    what is with the reverse reading dial? That seems very odd and not useful.
  8. If you look closely at the photo, you can see a...

    If you look closely at the photo, you can see a very light "NA" between "INDIA" and "POLIS".

    Columbus is also the home of Cummins Diesel, I believe, which is HOW the famous architects happened to...
  9. The only data I can find is from here, and...

    The only data I can find is from here, and suggests they were in business in 1904, no end date. I grew up in St Paul, but would have had no reason back then to notice McGrath.

    Point taken on...
  10. An old style metric micrometer, and an off brand metric micrometer (McGrath)

    The old style is really a clunky old style.

    https://i.imgur.com/4lpf5mM.jpg

    It is metric, and actually seems to agree very well with my newer metric mics, at least for small measurements.
    ...
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    Is that bit about the VFD correct? Do you...

    Is that bit about the VFD correct?

    Do you mean one running FROM single phase? Or one MAKING single phase?

    What then, is the motor?

    Six wires can be various things.... it can be a...
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    Only in Novosibirsk.........

    Only in Novosibirsk.........
  13. Well, I am an American, and I do not recall being...

    Well, I am an American, and I do not recall being asked for (or allowed to give) any input on that. So what you are really saying is the " US government" is saying "screw you". The rest of us don't...
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    This could use a different thread.... see last...

    This could use a different thread.... see last sentences below.




    You did not read/comprehend, unfortunately.

    What I WROTE was that the currents in the LOAD MOTOR are going to be similar...
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    Jim, nearly ALL of the current flowing to the...

    Jim, nearly ALL of the current flowing to the motor is "out of phase" for a motor that is not loaded..... the current from the generated leg, as well as the current from the "direct" or "pass-thru"...
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    The "fooling" is in the interpretation. The...

    The "fooling" is in the interpretation. The current is real and factual, actual electrons are flowing. Do not make the mistake of assuming the current is not real.

    If the amp-clamp measures a...
  17. Clamp-on level... so what have I got here as to age?

    OK, I know what it is for.... it's a level, made by Stanley, and evidently made to clamp onto a square, or other similar sized item to make a longer level.

    It is not very "valuable", that is not...
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    The idler normally puts out a voltage several...

    The idler normally puts out a voltage several percent lower than line volts, because it is the back EMF of the motor, which is always less than line volts.

    When you boost it with capacitors, you...
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    Actually, that's fairly normal. There are...

    Actually, that's fairly normal. There are various reasons for that
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    +100, and a super thank you..... clearly you...

    +100, and a super thank you..... clearly you "get it". Many do not.

    I see folks wringing their hands over rust and so forth, but they are too afraid to touch the "Precision Surfaces" of the ways...
  21. Thread: Motor Information

    by JST
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    233

    That motor is good for either the 575V, or 277V...

    That motor is good for either the 575V, or 277V if reconnected delta (300V, ideally). Not super useful. If you leave it wye it will work at lower power on 480V.

    Not sure why a transformer would...
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    Mag amp, eh? did not see that on the schematic I...

    Mag amp, eh? did not see that on the schematic I saw, but I am not certain it was the right one.

    EDIT: Found a better schematic, from Lincoln, which should be the right one. The mag amps are...
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    It has uses. He does not need one NOW. What...

    It has uses.

    He does not need one NOW. What he needs to do now can be done other ways. And maybe done better, since a test bar with a taper has to have a matching good taper in the spindle or...
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    What I am seeing here is a bunch of jumping...

    What I am seeing here is a bunch of jumping around from possibility to possibility. You kind of need to stick with it and change ONE thing at a time seeing what happens. Change two or more, and you...
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    Yup, like 90 VA open, and 10 VA closed.

    Yup, like 90 VA open, and 10 VA closed.
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