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Type: Posts; User: RustySparks

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  1. Replies
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    3,346

    Thanks, but I agree used or even new old stock...

    Thanks, but I agree used or even new old stock 453 HV transformers seem likely to have the same problem.
    Lots of good information over on the TekScopes group on groups.io. David Wise on that group...
  2. Replies
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    My Tektronix 453 which I have had since it was...

    My Tektronix 453 which I have had since it was new failed from what I understand is a common problem with these and similar Tek scopes. The HV transformer epoxy insulation becomes conductive over...
  3. So with using the average of 568 Kw-Hr/ton as the...

    So with using the average of 568 Kw-Hr/ton as the accepted value, our 60 lbs example requires 17.04 Kw-Hours (60 divided by 2000 times 568 = 17.04).
    Is this correct?
  4. I have been going around and around...

    I have been going around and around :willy_nilly:trying to make sense of this. It would seem that the result of the formula should give us the energy required to do the work, but B.t.u. / min looks...
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    I have used timers for a few things, I like them....

    I have used timers for a few things, I like them. But then I also make microcontroller controlled things and write programs for them in C. If I was doing this, a potential relay would be the way I...
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    Found a better version of the diagram in the...

    Found a better version of the diagram in the first post.
    256670


    If the starting relay you pulled the wire off is labeled power contactor in the diagram, this indicates that there is not enough...
  7. Replies
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    I completely agree with this when you are talking...

    I completely agree with this when you are talking about older electronics, especially vacuum tube based consumer electronics. However newer equipment starting around the mid 1970s is more likely to...
  8. Replies
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    2,354

    With 45 amp fuses, I would think the designer was...

    With 45 amp fuses, I would think the designer was thinking of 5 HP or less motor.
  9. Replies
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    Looks a little on the light side for 7.5 HP to...

    Looks a little on the light side for 7.5 HP to me. What size are the 2 fuses in holders on the input side? That may give a clue.
  10. Motors of this type could be run off either AC or...

    Motors of this type could be run off either AC or DC, but yours is almost certainly designed for AC of the typical wall outlet voltage in your area. Armatures and field coils are matched together in...
  11. Since this is a mill, you will want accurate...

    Since this is a mill, you will want accurate control of feed speed. Although it seems likely that the power feed motor would at least attempt to run while the main motor was running, You will want...
  12. It would help to know why you want to do this...

    It would help to know why you want to do this replacement. Has the original armature failed? Does the Dremel armature fit a chuck or other tooling you want to use?
  13. I have one of these from eBay, search there for:...

    I have one of these from eBay, search there for:

    10L Liter Ultrasonic Cleaner Heater Stainless Steel Industry Heated w/Timer

    240 Watt ultrasonic, 250 Watt heat. Electronic timer.
    Works very...
  14. This has always worked best for me, I did a few...

    This has always worked best for me, I did a few DB9s this way just last week.
  15. OOPS! I discovered I had the green and white wire...

    OOPS! I discovered I had the green and white wire color labels reversed on the drawing, makes for more confusion, but does not change description of operation. Here is updated drawing with hopefully...
  16. As I understand it, A1 and A2 are the coil of the...

    As I understand it, A1 and A2 are the coil of the contactor, So no, A1 and 3L2 are not the same.
    Line (white in photo) comes into 1L1, and also goes to the (NC) stop switch contact. When the stop...
  17. DISCLAIMER! proceed with caution! I do not claim...

    DISCLAIMER! proceed with caution! I do not claim to be an expert!
    Check the attached drawing carefully, this SHOULD produce the desired results, but proceed at your own risk.
    254020
  18. Replies
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    Perhaps a simple test circuit using 100 watt 120...

    Perhaps a simple test circuit using 100 watt 120 volt incandescent lamps connected as in the attached diagram would be helpful during the turning off breakers test. If no phase has leakage to ground,...
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    Only one transformer or winding is center tapped,...

    Only one transformer or winding is center tapped, like this.
    253098
  20. Replies
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    2,479

    Thanks good to know. Found a nice video...

    Thanks good to know. Found a nice video describing this method here:
    YouTube
  21. Replies
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    I am trying to learn more about 3 phase power,...

    I am trying to learn more about 3 phase power, now I am more confused. The OP appears to be in the USA, so seems pretty sure his plant has 120V outlets. Electrical code requires those outlets have a...
  22. 252812 Sent a text to the guy I bought the...

    252812
    Sent a text to the guy I bought the steady rest from on the off chance he might have the follow too, and after some searching around, turns out he did, so I bought it from him. He seems to...
  23. Thanks for the reply, but I have a nice...

    Thanks for the reply, but I have a nice telescoping steady already, liked it so much now I want the follow too! Oh well ....
  24. WTB telescoping follow rest for South Bend 9

    Interested in purchase of telescoping follow rest for South Bend 9. I am thinking these are going to be hard to find, any input appreciated.
  25. Actually it was 3BP1, also from the brother with...

    Actually it was 3BP1, also from the brother with the ARRL Handbook. Not sure where he got it, I think it was in a trunk of really neat stuff he brought back from a summer he spent with our uncle,...
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