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Thread: High-quality black-and-white photographs of large old machines and tools

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  1. #1
    Supporting Member Toolmaker51's Avatar
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    What great site! I have a decent [?] meter but I suspect not in keeping with Marv's description.
    Solution sounds like to check the coils as they are now; spool them being fed over my measuring machine to know length, and label the resistance results/ length. That should sort failed conductors immediately, and comparing the rest ought to be in a very narrow range. They were only a 110v lighting circuit, 15 60w lamps.
    If not good, oh well. Have 13,000 feet of yellow/ brown/ orange for 440v, green/ white/ black for 110v, forgot what is on hand to do 240v, only 2 machines get that.
    Again, great site, but its due to the participating members. I appreciate every morsel dispensed of heads up.
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

  2. #2
    Supporting Member mklotz's Avatar
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    Quote Originally Posted by Toolmaker51 View Post
    What great site! I have a decent [?] meter but I suspect not in keeping with Marv's description.

    The problem with measuring very small resistances is that the resistance of connections becomes so important relative to the resistance one is attempting to measure.

    Put your ohmmeter on its lowest scale and, with fingers off the exposed metal on the probes, press the metal tips together. Now, by adjusting the pressure with which you press the tips together, you should be able to change the indicated resistance by a large relative amount.

    Keep this in mind when you make your resistance measurements.
    ---
    Regards, Marv

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  3. The Following 2 Users Say Thank You to mklotz For This Useful Post:

    Toolmaker51 (Sep 7, 2019), volodar (Sep 7, 2019)

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