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  1. Replies
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    This is a job for a saturable reactor, AKA...

    This is a job for a saturable reactor, AKA magnetic amplifier (they are not exactly the same but close). The cool thing about them is that they are current controls. The voltage is a dependent...
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    I'm sure that would help but this is in a shop...

    I'm sure that would help but this is in a shop where anyone can use the machine. We try as much as possible to keep it as simple as possible. It is hard enough to train them to turn off the modular...
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    Question for JST and others about VFDs

    I am putting two VFDs on a Heald cylindrical grinder. A reoccurring problem is people who turn on the power, do the job, hit the stop button for the motor in use, and walk away with the main switch...
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    Hysteresis and remanence are two different...

    Hysteresis and remanence are two different animals. It is possible to have a core very high in one and low in the other. If you measure the starting friction of a flywheel in both directions, that is...
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    There was a similar discussion a while back and I...

    There was a similar discussion a while back and I had some doubts about the magnitude of the inrush, so I did my own investigation. You really need a ballistic galvanometer to do it right, but you...
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    I was about to post something similar to what...

    I was about to post something similar to what eKretz said when I saw he already had. Steel is compressible and expandable, otherwise we could not use interference fits at all. If you squeeze a...
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    Part of my standard orientation lecture to new...

    Part of my standard orientation lecture to new hires was that in regard to practical jokes, I have no sense of humor. Just plain don't do them, especially ones that can result in harm to a person or...
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    They are making cuts on each of the stations so...

    They are making cuts on each of the stations so each time the "gatling gun" indexes, a part falls out. In the early seventies I worked for a shop that made little screws for dental polishing cups....
  9. It's obvious. Pay for the gun with coins marked...

    It's obvious. Pay for the gun with coins marked 46 BC.

    Bill
  10. Google "semicircular canals". These are loops...

    Google "semicircular canals". These are loops full of fluid and have fine hairs that sense motion of the fluid, liquid gyros in your inner ears, the little buggers that make you seasick. I have had...
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    I know that one time, about 6-7 years ago, Baldor...

    I know that one time, about 6-7 years ago, Baldor sold gear head motors and speed controls.

    Bill
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    You would want to use motors with encoders. You...

    You would want to use motors with encoders. You would run one motor with normal DC power and the other two would run in lockstep. I have not run this circuit at very slow speeds. It looks at pulses...
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    Use AC tachometers. I can send you a circuit for...

    Use AC tachometers. I can send you a circuit for synchronizing two AC generators. The nice thing about this circuit is that it locks them with zero degrees phase angle where a lot of phase locked...
  14. Thread: What gas is this?

    by 9100
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    Especially since you can get a portable pressure...

    Especially since you can get a portable pressure swing adsorption oxygen concentrator like you see advertised on TV for people who need supplemental O2.

    Bill
  15. Thread: What gas is this?

    by 9100
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    1,827

    Good point. If it does, the dissolved gas is...

    Good point. If it does, the dissolved gas is probably near saturation and it wouldn't take much pressure drop to pull some out. Deaerating a liquid is interesting. The air comes out first in foam...
  16. Thread: What gas is this?

    by 9100
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    1,827

    It sounds like you are looking at a machine that...

    It sounds like you are looking at a machine that would extract oxygen from seawater I'm sure you could do it but it is going to contain ll sorts of things you don't want. You can separate the O2 with...
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    True, but I was thinking more in the lines of a...

    True, but I was thinking more in the lines of a controlled double blind study. Empirical data can still be valid and should be considered. For all we know, it might be that seeing everyone in masks...
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    In Missouri we are mostly masking, keeping tables...

    In Missouri we are mostly masking, keeping tables in restaurants and standing in lines more than 6 feet apart, barriers between people, hand sanitizing and getting many of our meals carry out. Some...
  19. I did that on both my lathes. On the 14 1/2"...

    I did that on both my lathes. On the 14 1/2" South bend I added four pushbuttons like you have on radios. Each has a separate speed control so I can switch from roughing to finish to threading speeds...
  20. The "guns" in the movie are bicycle tire pumps. I...

    The "guns" in the movie are bicycle tire pumps. I have a couple of identical ones from WWII, one has clips to mount it on my 1941 Indian army bike. You could certainly make a gun inside one, but I...
  21. First, do yourself a favor and mount the lathe on...

    First, do yourself a favor and mount the lathe on a 1/2" thick steel plate. I suffered with a 10K that belonged to a customer where I was consulting for some months. It was mounted on a wood bench...
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    What material? If metal, form one and plate the...

    What material? If metal, form one and plate the second layer on it.

    Bill
  23. It should be easy to remove the zinc...

    It should be easy to remove the zinc electrolytically, although I am not sure of the action at the boundary with the iron where the zinc has diffused into it. You should be all right because the...
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    I have stayed out of this infantile exchange and...

    I have stayed out of this infantile exchange and will largely continue to, but people keep asking where is the scientific evidence. Here is some-

    Missouri Coronavirus Map and Case Count - The New...
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    Perhaps we should petition for a red button on...

    Perhaps we should petition for a red button on the OP's posts that asks the moderator to lock or delete his thread. I appreciate your apology and agree, as I usually do with you.

    Bill
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