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  1. Replies
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    99

    Your simplest and most reliable bet will be a...

    Your simplest and most reliable bet will be a transformer-rectifier power supply. The motor is an inductive load, so a filter cap and v-reg would not even be necessary as long as the controls will...
  2. Yeah, these motors tend to run around 85~90% of...

    Yeah, these motors tend to run around 85~90% of FLA totally unloaded. Most of it is reactive. 10.5A is exactly what you're looking for.
  3. FWIW my 10 horse single stage has 1-1/2" intake...

    FWIW my 10 horse single stage has 1-1/2" intake and discharge piping. Roughly 35 CFM. Bigger pipes lend increased volume to help dampen the pulsating surges of air from reciprocating pumps. Less...
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    DTE light or medium, same as any other general...

    DTE light or medium, same as any other general lubrication job. Then put on safety glasses, take a step to the right and let 'er rip.

    I've had good luck with DTE, Vactra and Kano Kroil for...
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    634

    I guess it would help to understand exactly what...

    I guess it would help to understand exactly what context this braking system is to be used for.

    Are we talking service braking or an E-stop? 60 second stop time or as fast as practically...
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    634

    Brutal in what way? Mechanically? Thermally? ...

    Brutal in what way? Mechanically? Thermally?

    If the DC is ramped up via PWM rather than 'stepped' by closing in a contactor then there would be no real mechanical shock and surely there is...
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    High thermal conductivity, low reactivity at high...

    High thermal conductivity, low reactivity at high temperatures, easy to machine...

    Sounds like nickel plated copper might be a good bet for your application?

    For simple wood burning, nickel...
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    Very interesting question. Definitely an...

    Very interesting question. Definitely an engineering problem.

    I've heard of DC injection braking before but never mention of using capacitors for self-excitation. Just taking a stab in the dark...
  9. Overcurrent protective devices always trip for a...

    Overcurrent protective devices always trip for a reason. If the motor has run fine for the last 100 years but only recently began to trip on overload, chances are something has changed and it *is*...
  10. By a factor of 7... and yet they still work...

    By a factor of 7... and yet they still work without widespread complaints?

    If everyone who bought one of those kits took it out of the box, put it together, lit it up and immediately had it spit...
  11. It looks like the Lincoln Port-A-Torch kit comes...

    It looks like the Lincoln Port-A-Torch kit comes with a #3 welding tip, good for 5-11 CFH acetylene.

    How is it that a 10 CF cylinder can run a 5-11 CFH tip without issues in spite of everyone...
  12. One does not shift the brushes 90 degrees. One...

    One does not shift the brushes 90 degrees. One shifts the brushes more like 15-20 degrees from one factory witness mark to the other. Failing that, shift the brushes until you find the sweet spot...
  13. 'Potato' 'potato'. That's the code. Deal with...

    'Potato' 'potato'.

    That's the code. Deal with it or propose a change by submitting public input during the next code cycle. Chances are the code-making panel won't waste five seconds on...
  14. Paralleling conductors smaller than 1/0 AWG is...

    Paralleling conductors smaller than 1/0 AWG is illegal.

    Paralleling feeders and service conductors 1/0 AWG and larger is permitted, provided certain conditions are met. Off the top of my head...
  15. Heating torches for 'MC' cylinders - acetylene withdraw rates

    I was browsing a Victor catalog for information on their turbo-torches and noticed that their smallest tip sizes seem to demand no less than 2 CFH of acetylene - even the kits sold for use with 10 CF...
  16. Replies
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    As shown, your diagram depicts a 0.25uF snubber...

    As shown, your diagram depicts a 0.25uF snubber capacitor.

    A larger substitution will work just fine as long as it's intended for that use. (Snubbers are designed to have low inductance to...
  17. Thermite and his DC motor fetish. :rolleyes5: ...

    Thermite and his DC motor fetish. :rolleyes5:

    Line reactors are typically used in series with non-linear loads like VFDs to normalize their current consumption. Less intense spiky pulsations of...
  18. Truthfully the quality of most GFIs is just...

    Truthfully the quality of most GFIs is just disgusting, period.

    The failure rate on them is awful. Sometimes they don't trip, sometimes they don't reset... sometimes they jam up and buzz until...
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    0.25mFd. Not 25mFd. Whoops. 0.25 millifarad...

    0.25mFd. Not 25mFd. Whoops.

    0.25 millifarad = 250 microfarad. :dunce:

    Then again, what 'brilliant' engineer came up with the idea of expressing 250uF as .25mFd? That expression defies...
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    More information. Voltage ratings, type,...

    More information. Voltage ratings, type, continuous current/power rating, original manufacturer...

    if 25,000uF is not available, why not 30,000 or 40,000, etc.?

    DigiKey
  21. Trouble is we're talking about a 1-1/4"...

    Trouble is we're talking about a 1-1/4" feed-through manifold with enough spacing to accommodate pressure gauges, pressure switches, pilot valves, etc. That's a big chunk of metal. Several hundred...
  22. Drilling and tapping steel pipe for compressed air service

    I'm working up a bill of parts for a compressor discharge manifold. One of the unknowns I have is whether it is a safe and acceptable practice to drill and tap the wall of schedule 40/80 black steel...
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    In the video above? They're just noisy pilot...

    In the video above? They're just noisy pilot unloader pistons in need of new seals. Rebuild them and the rest of the pump will probably last another 100 years as long as IR will grudgingly still...
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    Kind of like this? ...

    Kind of like this?


    https://www.youtube.com/watch?v=sw6YporvEZU

    There's something to be said about a 700 horsepower compressor you can carry out a normal conversation in proximity of. They...
  25. This happens all the time on job sites. Long...

    This happens all the time on job sites.

    Long lengths of insulated conductors run parallel to each other in close proximity exhibit a property known as parasitic capacitance. In effect, the...
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