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  1. Replies
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    It sounds as much like there is a loose...

    It sounds as much like there is a loose connection in the control circuit for the RPC. I assume there is a main contactor to turn it on, and clearly if that drops out, it is going to stop.

    If...
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    338

    Boring bar and holder, direct t-slot mount.

    Boring bar and holder, direct t-slot mount.
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    184

    Your idea of what to do with the electronics is...

    Your idea of what to do with the electronics is correct.

    The issue can come up with a CNC where the 3 phase is rectified to produce DC for servo power. Then, one weaker phase will lead to more...
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    Not so. The PEAK is up there, sure. ...

    Not so.

    The PEAK is up there, sure.

    Rectified and not filtered, it will still act like DC at the RMS value or a little less, if the motor has enough inductance to smooth it a bit. It WILL be...
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    They were, on the first streetcars. Big problems...

    They were, on the first streetcars. Big problems all the time, almost killed the whole deal.

    Then a (Belgian engineer, I forgot his name) suggested carbon brushes, which seemed stupid due to...
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    2,109

    When you pull the chuck, leave that backplate on...

    When you pull the chuck, leave that backplate on the machine. Check IT for the things mentioned in post #11.

    And remember, problems with the backplate are generally fixable. They are things...
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    705

    No biggie, but the ball bearing in my Logan is...

    No biggie, but the ball bearing in my Logan is rated for 8000 lb. It would surprise me if the bearing of the SB is rated that high, but it clearly is rated for the typical work of the lathe.

    A...
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    So yes, a brush holder and brush.. The segmented...

    So yes, a brush holder and brush.. The segmented thingy being the commutator.

    Speaking of which, the commutator is dirtier than a bum's bum. And much rust is in evidence.

    Many things are...
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    I believe that if you extend your "thought...

    I believe that if you extend your "thought experiment", you will find there is no way to avoid a situation in which you create a spherical surface, convex on one, and concave on the other.

    By...
  10. Replies
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    I never proposed it for a contest..... and I...

    I never proposed it for a contest..... and I don't know that it is of that quality level anyhow.

    BTW, per the comments by our local troll #2, I do not agree on his assessment of good chucks...
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    Already covered a post or two previous to it.;)

    Already covered a post or two previous to it.;)
  12. Replies
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    Before you buy a new chuck, check your other...

    Before you buy a new chuck, check your other thread for some more posts that may help.
  13. Replies
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    2,109

    Used Bison 6 1/4" for $600 is way high,...

    Used Bison 6 1/4" for $600 is way high, considering what you are going to put it on. One of those things that makes no business sense, even though you are not a business.

    1) You can get 3 jaw...
  14. Pro tip: If you DO the foot trick, do NOT have...

    Pro tip: If you DO the foot trick, do NOT have your foot on the floor. If you ever played soccer (football to the rest of you) you know the tricks for "catching" a ball with your foot off the...
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    There are motors made for two speeds that have...

    There are motors made for two speeds that have constant HP in the two speeds, they draw more in the slow speed and double their torque. Those would make a difference.

    Looking up the type, I...
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    Remember the OP is using directly rectified AC,...

    Remember the OP is using directly rectified AC, and the voltage is lower than the spec 250V. The ripple on the voltage may be enough to cause the chatter. Generally, the motor could have enough...
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    You really just need an unloaded 3 phase motor of...

    You really just need an unloaded 3 phase motor of suitable size (can be the motor on a machine that is not in use) . No necessity for more capacitors, no need for any extra single phase stuff, no...
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    Thanks. It looks as if the time delay may...

    Thanks.

    It looks as if the time delay may be an air vane slowed deal that is activated by a spring system from the main contact. I've seen maybe one of those ever, and I am no youngster. ...
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    Just a note about vehicles. I bought a new...

    Just a note about vehicles.

    I bought a new Ranger last year, and I think it has a good mix of old and new. Mine does NOT have the big button to start and stop it, it has a key, that also opens...
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    Not familiar with that exact type*, but the...

    Not familiar with that exact type*, but the "relay heater" seems to be rated at double the actual motor current....

    If that is an "overload heater", it seems as if it offers no protection.

    No...
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    Data plate info is not surprising. Current is...

    Data plate info is not surprising. Current is about right for 230V DC motor, per NEC.

    The motor being open may let you see the brushes. If so, you can see if there is any sign of distress, like...
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    True.... there was generally a reason for that...

    True.... there was generally a reason for that outside of the motor itself, however, so the option really was not there. The motor might be for traction, and a slow start was needed, it might drive...
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    5 HP is on the borderline, maybe over it,...

    5 HP is on the borderline, maybe over it, depending. Smaller motors are less issue. Obviously this one has been started like that for quite a while, and the 220V is already a reduced voltage.
    ...
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    You have provided very little solid...

    You have provided very little solid information....Some added info might be useful, such as pictures of the innards, data plates, etc.

    However

    Of course, smoke is a bad sign, but may be due to...
  25. Not sure what the question wants as an answer. ...

    Not sure what the question wants as an answer. The three do not have definite names and connections. The only issue is whether the motor turns the right way or not. If not, then reverse two of...
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