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Type: Posts; User: JST

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  1. Replies
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    You mean just like suggested in post 14 above?

    You mean just like suggested in post 14 above?
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    356

    Two phase is equivalent to 3 phase, that is why...

    Two phase is equivalent to 3 phase, that is why they can be converted one to the other with just passive transformers.

    Using a capacitor phase shift will kinda work, but has essentially the same...
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    1,081

    Not an expert by any means, but a lot of problems...

    Not an expert by any means, but a lot of problems seem to occur from too long a wait between quench and temper.

    Your process, which seems to involve no tempering, seems odd. What rickyb says...
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    356

    Just a sparky is correct, and those transformers...

    Just a sparky is correct, and those transformers might not be too hard to find.
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    1,334

    Computers are made to not emit any radio...

    Computers are made to not emit any radio interference, not direct, not through the PSU, nowhere. That shielding works both ways, what cannot get out also cannot get in.

    So the culprit was indeed...
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    1,275

    Agree on "use it". I'd not even bother to fill...

    Agree on "use it".

    I'd not even bother to fill those spots, because they are not very exposed, not like a lathe bed.

    If you really want to fill them, clean the areas 5x with solvent, then once...
  7. Replies
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    1,061

    it's the hook. Check these two, the RH is a...

    it's the hook.

    Check these two, the RH is a blue-point rethreader, and it has a neutral to negative rake. The other has a hook positive rake, and anything else with any number of sides that has...
  8. Key here is whether it rotates absolutely freely...

    Key here is whether it rotates absolutely freely when not under power, or if it has some drag to it.

    If totally free, it may be a "PSC" motor that uses a capacitor, but no start switch. Many...
  9. Thread: Potential relays

    by JST
    Replies
    5
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    299

    They have worked for a lot of RPCs, so they are...

    They have worked for a lot of RPCs, so they are not that bad.

    The one serious problem I see is that unless added parts are used to prevent it, if the voltage drops, such as under an abnormal load,...
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    The issue with PCBs is more that they are defined...

    The issue with PCBs is more that they are defined as Hazmat, and disposal of Hazmat is regulated. There are penalties for improper disposal.

    If good, they may work for a long time and harm...
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    That's why I recalled the name. I was over there...

    That's why I recalled the name. I was over there near E Fillmore a while back, although not this trip.

    Fillmore Ave West is further southwest of there. Follow E Fillmore to the west as it...
  12. Yep Democracy is the worst style of government on...

    Yep Democracy is the worst style of government on earth.

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    Yep, that there is "the" real deal for oiling...

    Yep, that there is "the" real deal for oiling ball oilers. I made mine so the "point" seats without quite bottoming the balls, so the oil flows the right way (and not back at me), but the slot lets...
  14. Replies
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    From the look of those, there are no electrolytic...

    From the look of those, there are no electrolytic in the lot. They all look like metal can oil-filled to me, unless I missed seeing one.

    Yes, PCB is an issue. You do not want the ones that have...
  15. Replies
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    1,436

    If a soft-start ends up being the plan, it is not...

    If a soft-start ends up being the plan, it is not as dire as it is made to seem.

    The resistor need ONLY be enough to reduce the inrush (assuming transformer is essentially a short circuit when...
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    899

    I just got back from St Paul, grew up there in...

    I just got back from St Paul, grew up there in the 1950s/60s.

    I have a vague recollection of a "Fillmore", but am no longer sure where.

    Do you recall any other streets or map landmarks in the...
  17. Replies
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    very possible. That motor might have an issue

    very possible. That motor might have an issue
  18. Replies
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    It seems to be the same as Cerrosafe 158. The...

    It seems to be the same as Cerrosafe 158.

    The 117 is zero to a tad shrinkage.

    I doubt if either is good as babbit, way to low a melting point, but for your application likely fine.

    Another...
  19. Replies
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    Turn-on is often a high stress situation as...

    Turn-on is often a high stress situation as everything comes up to voltage, with high charging currents etc.

    Leave it on and turn off when totally finished.

    The only reason to turn it off...
  20. Replies
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    It's assumed the contactor is a size for the...

    It's assumed the contactor is a size for the machine. The resistors are what is "in play" here, and they need not handle the many tens of kW suggested by another poster, just the total energy...
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    1,436

    As you know, the soft starter limits the current,...

    As you know, the soft starter limits the current, so it need only be good enough to handle the actual current, and not the potential current. If you put 10 ohms in series with 250V, you get 25A if...
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    Yah, looks like overload units. And it sure...

    Yah, looks like overload units. And it sure looks oily/greasy in there.

    I'd be betting those are old as the hills, and no parts have been available for the overloads for decades. But let's see...
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    "Remanent flux". Definitely an issue. Had a 15A...

    "Remanent flux". Definitely an issue. Had a 15A variac at work in my lab, and seemed like every other time I turned it on it would pop that 20A breaker first time.

    I bugged the facilities...
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    That's good advice. He does, however, have the...

    That's good advice.

    He does, however, have the transformer, so it's a big issue to replace. A soft start may do the trick and let hm get through without a bunch of work and expense back through...
  25. Thread: Bridge rectifier

    by JST
    Replies
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    933

    True IF the switch is on the DC side, which for...

    True IF the switch is on the DC side, which for many things it is not. The magnet control may be on the DC side, but some used to put it on the magnet generator field (lower current, cheaper...
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