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  1. As I keep saying, I don't need to explore this...

    As I keep saying, I don't need to explore this issue. I did it in the 50s. If you want to see what I am talking about, hook a transformer secondary in series with a diode, an inductor, and a...
  2. Thread: Spring making

    by 9100
    Replies
    29
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    1,881

    slightly OT- there have been several comments...

    slightly OT- there have been several comments about making springs from already hardened and tempered material. These need to be stress relieved to perform properly. Forming them to a new shape means...
  3. In this case I didn't have to try it. I first...

    In this case I didn't have to try it. I first observed the problem in my early days of building ham gear with tubes, before solid state components had found their way down to us peasants.

    Bill
  4. Not always. In a conventional single phase center...

    Not always. In a conventional single phase center tapped full wave circuit, as the half cycle to one diode is dropping, the second one is rising and supplies a reference point. In circuits with gate...
  5. On tachometer generators I repaired, we just took...

    On tachometer generators I repaired, we just took them apart and remagnetized during reassembly. I don't know for sure what the magnet material is, but going by their vintage, probably Anico, which...
  6. Find someone with a slip roll. It has two rollers...

    Find someone with a slip roll. It has two rollers that grip the metal like a washing machine wringer and a third roller that can be adjusted for the amount you want the sheet to bend. You can sneak...
  7. The motors probably have permanent magnet fields....

    The motors probably have permanent magnet fields. If you remove the armature, breaking the magnetic path, the fields will lose strength. How much depends on the magnet material. With the best it will...
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    I installed it probably 30 years ago and the...

    I installed it probably 30 years ago and the counter I used is out of print.
    Here is a link to a distributor. Scroll down to the data sheets. I recently bought several meters for a similar...
  9. With an inductor only, you need to be sure there...

    With an inductor only, you need to be sure there is a current path to ground on the input side of it. Otherwise the energy is wasted on a negative pulse that goes nowhere.

    Re sharp spikes, one of...
  10. The thing I would like to have is a puller like...

    The thing I would like to have is a puller like the Hardinge compound that would be automatically activated.

    The other thing I would like to try would be some filter capacitance to average out...
  11. Two months in, the machinists are delighted with...

    Two months in, the machinists are delighted with the SCR replacements. The lathe runs smoother with the uniform firing, down to barely turning. I am equally delighted with being rid of hunting...
  12. Replies
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    444

    Solution to the PUzzle

    No one is going to try, so here is the solution, so simple as to almost be trivial. Note that in the resistance readings 1.85 ohms, give or take a few hundredths, is the lowest reading and occurs 6...
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    444

    Nope, the winding sequence should be possible...

    Nope, the winding sequence should be possible from the resistance readings/

    Bill
  14. Replies
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    Puzzle for motor experts

    I have a two speed motor, apparently Dahlander wound, with six leads coming out and no documentation of any kind. The leads are two black, two brown, and two pink. I arbitrarily assigned numbers,...
  15. Thread: OT- Glass cutting

    by 9100
    Replies
    52
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    2,423

    The Egyptians did that with hammers and slaves....

    The Egyptians did that with hammers and slaves. It illustrates the principle that nothing is simple. If something appears to be, it just means you haven't gone very deep into it.

    Bill
  16. I didn't encounter that in my brief time in...

    I didn't encounter that in my brief time in France but others have told me that is a standard practice of police there now, not just under the Nazis. No doubt someone there can tell us about the...
  17. Thread: OT- Glass cutting

    by 9100
    Replies
    52
    Views
    2,423

    When I was 9, I visited some cousins, one of whom...

    When I was 9, I visited some cousins, one of whom had a high school physics book. They let me borrow it and I read everything about electricity. I was fascinated and thought everyone else would be...
  18. I have a set from a motor I had to scrap just...

    I have a set from a motor I had to scrap just because it took up too much space. email me at [email protected] I'm not afraid to ship them. They will probably need to be crated because they...
  19. Thread: OT- Glass cutting

    by 9100
    Replies
    52
    Views
    2,423

    Have you seen the clip where Richard Feynman is...

    Have you seen the clip where Richard Feynman is discussing a flower?

    YouTube

    Long ago I concluded that the main value of education, which is usually pitched for getting a higher paid job, is...
  20. Thread: OT- Glass cutting

    by 9100
    Replies
    52
    Views
    2,423

    Here is an article that probably tells you more...

    Here is an article that probably tells you more than you want to know about glass aging.

    The polymer–polymorphoid nature of glass aging process - ScienceDirect

    One interesting comment was the...
  21. Thread: OT- Glass cutting

    by 9100
    Replies
    52
    Views
    2,423

    Doug, My understanding of tempered glass is...

    Doug,

    My understanding of tempered glass is that it is heated and then the surface rapidly cooled so it becomes essentially solid, then the inner portion cools and shrinks, putting the skin under...
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    I disconnected the power for a day and later...

    I disconnected the power for a day and later tried it with the computer cable aslo disconnected. The printer with only power, no computer, did the same thing. My first HP laser printer with an early...
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    911

    Unfortunately my computer can't use this program...

    Unfortunately my computer can't use this program because I am running Windows 2000. I started with it when it was new and it is very stable compared to ones like Windows 98 which was available then....
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    Circa 1959 I got a set of their ignition...

    Circa 1959 I got a set of their ignition wrenches. Flawlessly made, forged, polished and plated. A friend had a similar set and one day we were commenting on them and I said I had lost two over the...
  25. Thread: OT- Glass cutting

    by 9100
    Replies
    52
    Views
    2,423

    Not at normal temperatures. The myth about...

    Not at normal temperatures. The myth about windows in Pompeii flowing down came because Roman glass making was not very consistent and many windows were installed with the thick side down. If glass...
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