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Type: Posts; User: Just a Sparky

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  1. Replies
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    Gears. Blatantly obvious. :nutter: As if the...

    Gears. Blatantly obvious. :nutter:

    As if the obnoxious racket of spur gears loading and unloading like a car engine cranking endlessly could actually be mistaken for anything else, much less a...
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    ^ Generous corrosion allowance or not, a 100...

    ^

    Generous corrosion allowance or not, a 100 year old tank like that is bound to have thin spots. Mine had a whole line of brazed-shut pinholes along the bottom that I didn't discover until I was...
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    Compressor pump ID request

    Just posting to see if anyone in the know can ID this NOS air compressor pump for me. Ultimately I'm just looking for an RPM spec. If I can't find any literature on it then I'll go with the modern...
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    Finally got a video to upload. Blame Dropbox for...

    Finally got a video to upload. Blame Dropbox for the Potato-Vision™ quality because the source file is clean and crisp.

    Dropbox - 20220122_183611.mp4 - Simplify your life

    Here's roughly what...
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    Since we're talking ancient Brunner compressors,...

    Since we're talking ancient Brunner compressors, here's a WIP photo of my #542. One of the larger compressors intended for use in service stations or garages as described above.

    Original 1/2...
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    Skipped. 1800 watts is the largest heater...

    Skipped.

    1800 watts is the largest heater you're going to find on the market for a 120 V circuit. (1440 W code-compliant.) A 120 V, 15 A circuit simply can't carry any more juice without...
  7. Skipped. Type 'RA' is a brush-riding type...

    Skipped.

    Type 'RA' is a brush-riding type repulsion start induction motor. All four brushes are short-circuited together and bonded to ground via the motor frame. These motors have a...
  8. Would be interested in seeing it run once you get...

    Would be interested in seeing it run once you get everything put back together.

    Looks like it's got plenty of carbon built up. Might be worth wiping down the commutator and cleaning up the...
  9. Change the carrier frequency on the drive. ...

    Change the carrier frequency on the drive. Factory default is probably 4kHz. 12 or 16kHz will be less annoying.

    Nicer drives can be configured to add randomness to the carrier frequency (e.g....
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    Skipped. I've had good results with some...

    Skipped.

    I've had good results with some Kennametal WNMG holders.

    Pricy up front but only $1 per cutting edge thereafter. $60 for a pack of 60 cutting edges. I just use Carbide Depot's...
  11. Bullshit. All four brushes are short-circuited...

    Bullshit.

    All four brushes are short-circuited together and bonded to equipment ground via the motor frame.

    A standard repulsion start induction motor cannot be electrically reversed. Two 120V...
  12. Skipped. Objects of differing densities will...

    Skipped.

    Objects of differing densities will accelerate at identical rates under the influence of a gravitational field in the absence of any opposing forces. At 1G, this will always be 32.15...
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    Leaky Chicago couplings

    I'm having issues with some Chicago style (2-lug) air hose connectors. These guys:

    http://web.tradekorea.com/upload_file2/product/185/P00322185/cbe9caa6_b4fd294d_01c7_419b_bc75_87b9d348ef31.jpg...
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    12 gauge Unistrut, some square washers and cone...

    12 gauge Unistrut, some square washers and cone nuts. 1-1/4" fenders to hold it all down.

    ;)

    Plenty sturdy for a 5 horse motor. Maybe not for the pump.
  15. Skipped. Official response from a Kurt...

    Skipped.

    Official response from a Kurt representative:
  16. Replies
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    Floating voltages on an AC system are often...

    Floating voltages on an AC system are often "phantom" readings caused by parasitic capacitance and/or inductance. That generally means you've got an isolated section of wire between two open...
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    Ferrite core transformers, as found in old CRT...

    Ferrite core transformers, as found in old CRT television sets have been known to store nasty residual charges after being de-energized (A.K.A. disconnected).

    Silicon steel core transformers as...
  18. Above are the reasons why I'm looking at making a...

    Above are the reasons why I'm looking at making a droplet lubrication system rather than a fog/mist system. Big gravid droplets are much less of a respiratory hazard than microscopic mists which can...
  19. Cutting fluids for droplet lubrication

    I'm looking to set up a droplet lubricator (a.k.a. "FogBuster", et. al.) on my mill to help with chip removal and tool lubrication. Not so concerned with cooling as I don't do high speed machining...
  20. Call a state licensed elevator tech and have it...

    Call a state licensed elevator tech and have it inspected before putting it back into service. Too many things that can go wrong with electrical installations when they get wet. Transfer the...
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    TI-84 allows you to configure your preferred...

    TI-84 allows you to configure your preferred decimal length and notation. Though as mentioned it may be a little bulky and overkill for the OP's needs.

    ...Though the ability to write your own...
  22. You've described a manual star-delta starter.

    You've described a manual star-delta starter.
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    *Slow clap* :Yawn:

    *Slow clap*
    :Yawn:
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    Dumore 5G parts interchangability

    I'm looking at a Dumore No. 5G tool post grinder a fairly low price. It includes some stones and pulleys, but is missing two of it's three interchangeable spindles. I'm wondering if I can obtain...
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    I.D.ing Greenfield threading dies

    Picked up an old Greenfield pipe threading kit a while back for a steal of a deal. Almost entirely complete for 1/2" NPT through 1-1/2", except the dies and collar for 1" pipe are missing.
    ...
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