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Type: Posts; User: JST

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  1. Replies
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    Right... because they are (almost) always...

    Right... because they are (almost) always WRONG.... If they understood the problem, they would be able to fix it. Both because they know what it is, and because if they could understand it, they...
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    Maybe get back to the basics of this issue? ...

    Maybe get back to the basics of this issue?

    The OP has a machine that is known to draw a lot of current on start-up. We, or at least "I", do not know if the machine "starting under load" simply...
  3. Thread: 45k$ Dining table

    by JST
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    Yep, but at least they spread it around!

    Yep, but at least they spread it around!
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    Your remembrance is a tad off. Just to set the...

    Your remembrance is a tad off.

    Just to set the record straight here, an "RPC" is a 3 phase motor that is driven with 2 wires. It will run like that, and yes, it can only produce 2/3 power. But...
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    Yeah, the amount taken off per pass..... One...

    Yeah, the amount taken off per pass..... One thing to do is when you brush off after each scraping, before stoning, brush it all to one place. When you are trying to get a fairly large area to...
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    You have a lot of what appear to be "bull's...

    You have a lot of what appear to be "bull's eyes", rings of dark around spots of hardly any blue.

    The checkerboard is good advice. What I have done instead, is first to area concentrate, as you...
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    A derated VFD is very unlikely to trip out on...

    A derated VFD is very unlikely to trip out on motor current if used within reason. The trip current will be 300% or more of motor current at a 2:1 de-rate, and such setups can be made to work most...
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    It "has" a protractor feature, but it has as its...

    It "has" a protractor feature, but it has as its main function, measurement. And, yes, Rabone made it, and K&E put their name on it, without bothering to remove the Rabone name.

    It is almost...
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    I have to agree. A VFD is the device to use. ...

    I have to agree. A VFD is the device to use.

    It gives good 3 phase, well balanced, no issues with the generated leg. It is expensive, but so are grinders, and downtime.

    You will have to find...
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    Was this a case of "NO" oil? or a case where the...

    Was this a case of "NO" oil? or a case where the mechanic didn't put in all three?

    Sounds more like "no" oil, which makes it a little surprising to me that it ran 30 miles, but it's possible, I...
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    It seems to me that a single channel is about the...

    It seems to me that a single channel is about the last thing you want.

    If you want to use channel, weld two together. Or use a round, or pipe. Square tube maybe, pipe is stronger against...
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    I obtained a geologists UV source, with long and...

    I obtained a geologists UV source, with long and short wave filters. Checked the rule with it.

    The "long and short" of it seem to be that there is no fluorescence at all, and it is most likely...
  13. Yes. It's a current limit, actually, and just...

    Yes. It's a current limit, actually, and just one winding supplies that, so you get 1/3 rating.

    If you only have 120/240 for single phase, then just get a single phase transformer.
  14. That has been known for centuries.... you can...

    That has been known for centuries.... you can see a lot of stuff better to the side in the dark.... it's just as Jim R said.... the rods are dark vision, and they are also black and white...
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    Yeah, I get it. But that does not guarantee...

    Yeah, I get it. But that does not guarantee that crud did not get in there. It seems credible that it did, from the places that look like metal was ripped out. I've seen that on lathe ways also,...
  16. How many 120 or "220" circuits do you anticipate...

    How many 120 or "220" circuits do you anticipate needing?

    Do you have any 240V 3 phase needs?

    The 208/120 will serve all of the 240 3 phase, and as many 120V as you need, up to the transformer...
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    I see two things on the ways. I see regular...

    I see two things on the ways. I see regular "scoring", linear marks.

    I also see "gouges" that appear similar to what I have seen when swarf gets under the slide and gets carried along between...
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    In fact, you SHOULD NOT connect it. It does not...

    In fact, you SHOULD NOT connect it. It does not help on motors, and can cause unbalanced currents.
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    The motor is 220/380. Those voltages are when...

    The motor is 220/380. Those voltages are when wired delta and star, respectively. As a sanity check, windings wired star are always a higher line-to-line voltage than the same windings in delta,...
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    Yes. The maximum high voltage for a nominal...

    Yes. The maximum high voltage for a nominal 240V power line is 264V (corresponding to a 120V max of 132V). That is the UL/CE max voltage at which the 240V equipment needs to be safe as far as...
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    I am guessing the voltages that are at 260 and...

    I am guessing the voltages that are at 260 and 280 are to the generated leg.

    I am also guessing that you have "balance capacitors" in place.

    The 280V is so high that it is way out of the normal...
  22. Looking it up on the web, I found that part...

    Looking it up on the web, I found that part number listed at anything from 1k ohms to 3 k ohms.

    Either the "M1MPK" part is only the mechanical style, which is quite possible, OR the folks showing...
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    Hah..... The Peel-away No1 (lye in a gelling...

    Hah..... The Peel-away No1 (lye in a gelling material) is made for use on wood. I've used it on wood quite a bit, and it does a great job. The methylene chloride crap was horrible on wood. Not...
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    When I used the Citri-strip, the paint just...

    When I used the Citri-strip, the paint just blistered up and came off in strips, first try. Used in on a machine base, and was very happy with it. Might have been whatever that particular paint...
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    Is the original motor an actual alnico magnet? ...

    Is the original motor an actual alnico magnet? That would explain it losing strength. I have pulled ceramic magnet motors apart and had no significant change in strength. There is an air gap,...
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