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Type: Posts; User: JST

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  1. Replies
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    if you want an E-stop you want it to STOP NOW. ...

    if you want an E-stop you want it to STOP NOW. The last thing you want is to have your neck or hand become the mechanical brake because the e-stop caused a fault-out and refused to stop, letting the...
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    The simple explanation here is that the motor,...

    The simple explanation here is that the motor, being single phase, has a start winding. That winding determines which way it spins.

    The connections have to be reversed to JUST that winding in...
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    Do you have any actual proof that the resistor is...

    Do you have any actual proof that the resistor is taking power?

    Many things would be explained if the system were not actually working as intended......

    If it is not on a heatsink and you...
  4. You should have kept the old one..... I had...

    You should have kept the old one.....

    I had one that croaked on an S10. Took it apart and found that the issue was cracked lead-free solder joints on the connector-to-PC-board joints. Thiis was...
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    I see no reason not to. The only issue is that...

    I see no reason not to.

    The only issue is that you may not be able to get all the power through the flat belt system at all speeds, which at the lower end of the speed range is only really good...
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    Open delta is weaker on the third phase, and so...

    Open delta is weaker on the third phase, and so more variable in voltage. But you get the 230/240VAC.

    The 208 is weaker on ALL phases all the time, due to being lower voltage, and may not suit...
  7. Thread: Early micrometer

    by JST
    Replies
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    791

    looks like it was cut with a slitting saw or...

    looks like it was cut with a slitting saw or similar on a horizontal mill, and yes, the travel was a bit too far or saw too big. The cut is just about right for too big a saw being run over to get...
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    It's cast iron, so dunno about bending it.

    It's cast iron, so dunno about bending it.
  9. Replies
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    Eh, the only value in it was seeing what is, and...

    Eh, the only value in it was seeing what is, and what is not, in that device.

    The makers advised him to adjust what may be the potential relay to solve his problem.
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    Yeah, thinking again about it, it's the Alaska...

    Yeah, thinking again about it, it's the Alaska part that hurts it.

    In the 48 there would be someone who wanted the machine for reasonable bucks based on condition. And the shipping would not...
  11. Replies
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    Yeah, that's the idea. The capacitors, are a...

    Yeah, that's the idea. The capacitors, are a maybe, to me, but they could be a bit of a help.

    I like the extra winding in the idler the best, but that's harder to do.

    You need the boost...
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    It is, but he is already committed. It could be...

    It is, but he is already committed. It could be different if we were egging him on to do it based on the increased value afterward. THAT would indeed be "spending his money".

    Here, we are...
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    Is that an "RPC"? If so, I do not see much...

    Is that an "RPC"?

    If so, I do not see much need for the capacitance.

    I would suggest an autoformer that boosts the generated leg to be perhaps 5% to 10% high at no load, which will probably...
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    Mine has the headstock aligned with the end of...

    Mine has the headstock aligned with the end of the bed, AND the gear guard plate is perpendicular to the bed, or close enough to not be an issue.

    It sounds like your problem is the warped gear...
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    Well, having done all that, you better make sure...

    Well, having done all that, you better make sure the oiling system is in top-notch working condition!



    Well, that WAS 3x what they were worth before the beds etc got re-ground.

    NOW, it...
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    It has its issues, but it also seems to be used....

    It has its issues, but it also seems to be used.

    The good news is that if you set it up to work best at full power, or near that, then the imbalance is toward the lower current/power area where it...
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    It probably is helping, which would be the case...

    It probably is helping, which would be the case if you find that the resistor heats up after some stops. At some point, there is just too much energy to get rid of, however. Then either parameters...
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    OK, not my pic, I found it on Youtube..... ...

    OK, not my pic, I found it on Youtube..... video from a guy who seems to work on model steam engines, but his converter was not working right. You can ignore the chatter and just look at the...
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    Interestingly, I got a look inside a "transwave"...

    Interestingly, I got a look inside a "transwave" converter (British). It appears to be a transformer only type, which surprised me. So they are in commercial production for shop use.
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    Overvoltage trip means the resistor is not...

    Overvoltage trip means the resistor is not effective enough to handle that amount of brake energy.

    There may be a parameter that adjusts the resistor duty cycle (resistor current, really). If so,...
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    The drop may not be large. When there is no...

    The drop may not be large.

    When there is no load, 80% or more of the low current may be reactive current (useless current). But under load, the reactive current does not change much, however...
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    It actually corrects PF on either, depending on...

    It actually corrects PF on either, depending on where put. If put on the pass-through, per your original question, it corrects the PF "looking into" the RPC. The "balance" capacitors correct the...
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    yes, that's what it does.

    yes, that's what it does.
  24. Replies
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    Steelman method is the same idea in reverse. ...

    Steelman method is the same idea in reverse.

    Instead of creating 2 phase via the 90 deg phase shift and then converting to 3 phase with the Scott connection, the motor is converted to a 2 phase...
  25. I have a porta-power setup that came with a shop...

    I have a porta-power setup that came with a shop made setup made like that that they actually used for some sort of testing. Had the tension rods etc. I guess it worked fine, all I wanted was the...
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