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  1. Replies
    35$$
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    150630-1007 EDT Roger: Sorry, I did not...

    150630-1007 EDT

    Roger:

    Sorry, I did not realize the original material was his.

    .
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    35$$
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    150620-0913 EDT flinnagin72: To make a...

    150620-0913 EDT

    flinnagin72:

    To make a direct precise copy of a picture or written material without permision is a violation of copyright law.

    If you take a photo of anything then that is...
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    6$$
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    150629-1045 EDR Aluminum oxidizes very quickly...

    150629-1045 EDR

    Aluminum oxidizes very quickly in air. Chemistry class. Aliminum oxide is a good insulator. Anodized aluminum has a thicker oxide layer than just the normal oxide layer of aluminum...
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    150627-1451 EDT Some experiments. Use a...

    150627-1451 EDT

    Some experiments.

    Use a high impedance meter.

    1. Have someone drive car into position. Another person measures the instantaneous voltage from car body (a conductive location)...
  5. 150627-1022 EDT petersonra: You have a good...

    150627-1022 EDT

    petersonra:

    You have a good suggestion.

    One link to Sola is:
    http://www.solahevidutysales.com/pdf/ups/SDU-DC-DIN-Rail-UPS.pdf

    .
  6. 160627-0906 EDT Tony S: Why did I suggest a...

    160627-0906 EDT

    Tony S:

    Why did I suggest a car battery?

    The original post indicated a UPS. Instead of using a UPS I was suggesting a battery at the input of the PLC and using a regulated...
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    2$$
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    307

    150626-0920 EDT The plot I originally included...

    150626-0920 EDT

    The plot I originally included was a fairly high resolution .PNG file that imported with greatly reduced line quality. Thus, not very readable. Here I am trying again. This time...
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    Power plot of a CNC machine cycle.

    150625-1923 EDT

    Attached is a power plot of one cycle of a HAAS VF3 CNC machine drilling and tapping a 1/4-20 hole.

    The measurement was made with a TED 1000 System. The primary supply is an...
  9. 150625-0855 EDT I would be inclined to...

    150625-0855 EDT

    I would be inclined to directly connect a 12 V car battery to the PLC power input, and charge the battery and power the PLC with a voltage regulated power supply with vertical...
  10. Thread: Batteries

    by gar
    Replies
    6$$
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    393

    150624-2343 EDT preenee1: Exactly what...

    150624-2343 EDT

    preenee1:

    Exactly what winnie said.

    If you do not have knowledge of calculus, then a way to see how power in the load varies as load resistance varies with constant source...
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    7$$
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    150623-1128 EDT My Fluke and Beckman DVM (RMS...

    150623-1128 EDT

    My Fluke and Beckman DVM (RMS reading) are good to about 25 to 50 kHz on the high end. The Fluke 27 (average reading) has a somewhat higher upper frequency, and Simpson 270 (higher...
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    15$$
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    150622-1958 EDT Some Internet reports indicate...

    150622-1958 EDT

    Some Internet reports indicate that the short circuit current of a 9 V battery may be in the range of 5 A for several seconds. Not a safe choice for a classroom setup.

    Consider...
  13. Thread: motor ?

    by gar
    Replies
    5$$
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    324

    150620-0846 EDT I tried Google Books to see if...

    150620-0846 EDT

    I tried Google Books to see if I could bring up the graph, but only a top portion of the graph showed. Now it appears that Google is providing only very small snippets of...
  14. Thread: motor ?

    by gar
    Replies
    5$$
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    324

    150619-1956 EDT A sample set of calculated...

    150619-1956 EDT

    A sample set of calculated curves for an induction motor are shown on p 213 in Fig. 13-12 of "Alternating-Current Machinery", by Bailey and Gault, 1951, McGraw-Hill.

    Above 50%...
  15. Replies
    33$$
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    1912 Switchboard

    150619-1013 EDT

    The following photos are not very good resulting from the plexiglas enclosure and the reflection of the close by brick wall. This was 250 V DC with 20,000 A meter, rated 4000 kW.
    ...
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    33$$
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    1,609

    1912 Switchboard

    150619-1013 EDT

    The following photos are not very good resulting from the plexiglas enclosure and the reflection of the close by brick wall. This was 250 V DC at 20,000 A.


    12787

    12788
    ...
  17. 150619-0814 EDT jakedoub: A closely coupled...

    150619-0814 EDT

    jakedoub:

    A closely coupled transformer (normal iron core transformer) reflects voltage and current between the primary and secondary by the turns ratio. Your transformer has a...
  18. Thread: Barcode Scanner

    by gar
    Replies
    5$$
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    345

    150617-0949 EDT fifty60: In many ways your...

    150617-0949 EDT

    fifty60:

    In many ways your question is not clear. But GoldDigger has given you some useful information.

    See "RS232 Pinout" "DE-9" at...
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    1$$
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    150611-0851 EDT Quite simply it is 15*120 +...

    150611-0851 EDT

    Quite simply it is 15*120 + 20*120 = 35*120 = 4200.

    .
  20. 150609-2141 EDT An AC or DC magnetic field...

    150609-2141 EDT

    An AC or DC magnetic field does affect a moving electron, or a beam, or a stream of electrons.

    Magnetic deflection was the primary means of scaning (deflection) of the electron...
  21. 150607-2117 EDT fandi: The 208 V voltage...

    150607-2117 EDT

    fandi:

    The 208 V voltage from a wild leg 240 V delta is happenstance of the secondary circuit. It is not something provided to give you a 208 voltage.

    If you put a resistive...
  22. 150607-1217 EDT fandi: Around here wild leg...

    150607-1217 EDT

    fandi:

    Around here wild leg deltas are usually one large center tapped transformer for single phase loads with a single smaller transformer to supply the wild leg. Lighting load...
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    34$$
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    150531-2159 EDT justdoc: I have an idea for...

    150531-2159 EDT

    justdoc:

    I have an idea for such a device, but I don't plan to develop it.

    I have never had a neutral failure in my lifetime. But at my home we have 3 phase delta for the...
  24. Thread: Well Pump Hookup

    by gar
    Replies
    13$$
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    576

    150529=1017 EDT An additional comment on the...

    150529=1017 EDT

    An additional comment on the capacitor run motor.

    A capacitor run motor is a two phase motor with a rotating magnetic field. This will run in only one direction. To change...
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    150529-1002 EDT ptonsparky: As in earlier...

    150529-1002 EDT

    ptonsparky:

    As in earlier discussions about one of your projects I had suggested a power monitor. A power monitor might be useful here.

    To solve short time peak overloads...
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