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  1. Borrow, beg rent, steal, or in final desperation,...

    Borrow, beg rent, steal, or in final desperation, buy an oscilloscope. People go through this endless comparing voltages and guessing when a picture will settle the debate in seconds. It works best...
  2. I once repaired a heater for what must have been...

    I once repaired a heater for what must have been a huge aluminum annealing oven. The heater was an edge wound ribbon around eight inches in diameter and 4+ feet long. The customer said that some...
  3. First, the usual purpose of a delta/wye...

    First, the usual purpose of a delta/wye connection is for soft start. Instead of using a transformer to start on a reduced voltage, you connect the motor in a way (wye) that sets it up as a higher...
  4. Why does anyone even have to ask? You simply...

    Why does anyone even have to ask? You simply don't mount accurate devices on painted surfaces. Paper is fairly uniform thickness from one point to one a few inches away. Paint isn't.

    Re Gits...
  5. Why 60 cycles for the clock? Any even number of...

    Why 60 cycles for the clock? Any even number of cycles is just a matter of the number of gear teeth. When I worked with 400 cycle equipment a lot, one of the main annoyances was that 60 does not go...
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    The life long radio operator who taught me Morse...

    The life long radio operator who taught me Morse code was on cargo ships in the Pacific during the war. If you are familiar with the book and movie "Mr. Roberts". he could have been Mr. Roberts...
  7. I have done that with a permanent magnet DC motor...

    I have done that with a permanent magnet DC motor connected to a pinch roller with electronics to effectively govern the speed to zero. By building in a torque limit in the electronics, the drag...
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    6,599

    It depends on the culture. One time Marci listed...

    It depends on the culture. One time Marci listed the things she had done in readiness for a hurricane which ended with 100 MRIs and then "I can always cook the dog." I forwarded it to my Bulgarian...
  9. Before investing the labor to mount and hook up...

    Before investing the labor to mount and hook up the transformer, be sure it will close your starters. The inrush on a contactor coil is much greater than the holding current and with a transformer...
  10. Replies
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    6,599

    A couple of days ago a machinist repaired the...

    A couple of days ago a machinist repaired the power cord on a grinder that I was going to do but did some other things first. I jokingly threatened to file a grievance. He related the time in a...
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    I remember reading about a Mauser rifle proof...

    I remember reading about a Mauser rifle proof testers deliberately blocked and fired. I don't remember the caliber but it was one of the 8mm/30'06 class. The action survived and the gas leaked out....
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    3,402

    Just to muddy things up further, For a given...

    Just to muddy things up further, For a given power level, you would use less capacity at the higher voltage in most cases.

    Bill
  13. Replies
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    3,402

    Just so, and a couple of inches of wire can make...

    Just so, and a couple of inches of wire can make a huge difference. Ideally, power supply filter capacitors should have four terminals, two for the rectified AC coming and two for the DC leaving,...
  14. Thread: Contact cleaning

    by 9100
    Replies
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    1,601

    The dirt in this case was coal black. This is an...

    The dirt in this case was coal black. This is an old surface grinder so it has been running in coolant mist and assorted other oil. etc. for decades.

    I got some space back in my email box. ...
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    3,402

    They list one removed from a scope they parted...

    They list one removed from a scope they parted out for $40, but it may have the same problem. I will have to look at mine. It is likely impregnated, making it very difficult to count turns. I had...
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    1,236

    That is a motorcycle wheel with the brake drum...

    That is a motorcycle wheel with the brake drum and speedometer drive gear. No sprocket so it has to be a front wheel.

    Bill
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    One of my friends was a digital guy while I am...

    One of my friends was a digital guy while I am more analog. He liked to point out that an analog loop, no matter how tight, must have an error to function.

    Bill
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    One time my Bulgarian artist pal had a show in a...

    One time my Bulgarian artist pal had a show in a gallery downtown (next to Lafayette Square for you locals) and the night before opening wanted to make a few changes. When we got there, a yoga class...
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    1,838

    I have one of those. Before you try to operate...

    I have one of those. Before you try to operate it, check the various drive rollers, rubber bushings, etc. They had deteriorated on mine. I never noticed any print through. Remember that the wires...
  20. As I have posted here countless times, many years...

    As I have posted here countless times, many years ago I swore never again to run a single phase lathe with a drum switch. For example, if you have it running forward and do something like getting a...
  21. Thread: Contact cleaning

    by 9100
    Replies
    40
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    1,601

    This isn't a starter, just a little 2 amp switch....

    This isn't a starter, just a little 2 amp switch. The contacts are riveted in place so I cannot even see the surfaces. I doubt that I removed a thousandth making a clean spot. I did remove a lot of...
  22. Thread: Contact cleaning

    by 9100
    Replies
    40
    Views
    1,601

    The switch with sandpaperd contacts is back on...

    The switch with sandpaperd contacts is back on the machine which is running normally while the debate goes on.

    Bill
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    7,281

    It was a long time ago and they certainly have...

    It was a long time ago and they certainly have made improvements, but my experience with Galil was dismal. I used one of their cards in a PC to replace the punch tape programmed system on my Boston...
  24. Thread: Contact cleaning

    by 9100
    Replies
    40
    Views
    1,601

    Reed switches are an example of the principle...

    Reed switches are an example of the principle that nothing is simple if you dig down deep enough. A serious problem is carbon contamination. The arc concentrates it and you wind up with a miniature...
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    1,195

    Try an MOV instead of a diode. The MOVs...

    Try an MOV instead of a diode. The MOVs resistance will dissipate energy while a diode simply keeps the current circulating until the coil resistance eats it up.

    Bill
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