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Type: Posts; User: JST

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  1. Replies
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    There are wrenches like that that were made for...

    There are wrenches like that that were made for use with old-time square pipe dies. Could be for that, could be for any of several dozen other possible specific uses.
  2. Sure. However, in some cases it is desirable...

    Sure.

    However, in some cases it is desirable to NOT have the particular winding hard grounded, as part of the design of the device. In that case, it is possible to monitor the winding so as to...
  3. That is true if you are supplying a "branch...

    That is true if you are supplying a "branch circuit". If the transformer is part of a machine, there is no such NEC requirement. UL may have requirements on construction of a transformer used...
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    Just to put a little visual help with this, here...

    Just to put a little visual help with this, here is a regulation SB thread dial for an 8 TPI leadscrew. Take a good look at the tooth form, and it is really not much like most gear teeth.

    This...
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    You don't quite "just get 2/3" or "just get 1/3"....

    You don't quite "just get 2/3" or "just get 1/3". The biggest issue is that since you are not using all the windings, the motor can get overheated in the winding that is being used.

    Because...
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    As for the original post and the topic of threads...

    As for the original post and the topic of threads that go down the crapper......

    Mods have the ability to delete, or edit, posts. If a post has something useful, as well as some O/T crap, the mod...
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    The number of teeth is set by the ratio needed...

    The number of teeth is set by the ratio needed (turns per inch of leadscrew). That is a "given".

    You effectively have a stub tooth rack, and you need a stub tooth gear to go with it.
  8. Dollars to waste paper that if the temperature...

    Dollars to waste paper that if the temperature has changed while it's been out there, condensation has happened. No bag or container can keep it out forever, and there are probably holes for wet air...
  9. There is one advantage to cleaning up a machine...

    There is one advantage to cleaning up a machine to use. You learn a lot about it, much more than a button pusher or dial spinner does. That can be helpful, and per my very odd notions about stuff,...
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    pretty much. If there is any service that is...

    pretty much. If there is any service that is harder on a battery than the railroad car battery (back when they had lots of those), I don't know what it might be.

    Neglect, vibration, impacts,...
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    Ah, yes, that pesky detail. The leadscrew...

    Ah, yes, that pesky detail.

    The leadscrew is an acme thread. That is not necessarily fitting a gear tooth, it is not quite a rack.

    It's not far off from a 14.5 degree rack, but the...
  12. Thread: OT A1 Canon Camera

    by JST
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    481

    People who "do film cameras" usually also have...

    People who "do film cameras" usually also have darkrooms and develop their own. And a substantial number are doing black and white photography, which is where film is usually miles better than...
  13. Thread: OT A1 Canon Camera

    by JST
    Replies
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    481

    Limited value. Special cameras sure. Old...

    Limited value.

    Special cameras sure. Old Leica, Hasselblad, antique "view" cameras, that sort of thing.

    Standard, mass produced consumer grade cameras, not so much. I've got a large...
  14. Thread: OT Lead Pipe

    by JST
    Replies
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    7,246

    The yard trap would stop the smoke. That's what...

    The yard trap would stop the smoke. That's what it's for... to stop gases from the sewer.

    They want to change that here as well. But they have not done it completely. Probably have done only 1%...
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    That has not been a problem with newer devices. ...

    That has not been a problem with newer devices. The early ones barely worked to begin with, using old-style straight bipolar transistors, which had lots of problems when used at the high voltages...
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    Good thing about batteries is the ability to have...

    Good thing about batteries is the ability to have full current on demand. Direct from solar panels is great on a sunny day. Pretty crummy with heavy overcast, you'd need massively oversized arrays...
  17. Thread: OT Lead Pipe

    by JST
    Replies
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    7,246

    I've had the pipes lined here. Not cheap,...

    I've had the pipes lined here. Not cheap, although a bit cheaper than digging up the pipes, which were in fact 9 feet down, and ran under a couple trees. The drains, NOT the water supply pipes,...
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    Toss the "cold chisel" back in the truck bed,...

    Toss the "cold chisel" back in the truck bed, there are more special purpose chisels for the typical things like cutting keyways, etc.

    For that, you want a "cape" chisel. It has back relief so...
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    At least they SHOULD. Sometimes the bean...

    At least they SHOULD. Sometimes the bean counters don't agree.

    I've designed several VFDs that were INTENDED to have the load simply switched on and off instead of using the VFD slow start.
    ...
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    Yes, that way of looking at it is fine. ...

    Yes, that way of looking at it is fine. Essentially, if you want that 20AH draw, the panels need to be able to replace about 24 AH before the next draw starts, in the worst solar conditions you...
  21. Thread: OT Lead Pipe

    by JST
    Replies
    124
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    7,246

    The worst thing about china is that they got the...

    The worst thing about china is that they got the rest of the world to pay for most all that internal work. The US was a large piece of that.

    I have read that "china" owes a lot of money to...
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    There are many folks who actually do that. ...

    There are many folks who actually do that.

    It clearly helps if the motors are similar. And if you run in plain V/Hz mode, so no special calculations and measuring of the motor by the VFD is...
  23. Thread: OT Lead Pipe

    by JST
    Replies
    124
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    7,246

    Well, that's an opinion, not a fact. If...

    Well, that's an opinion, not a fact.

    If that were true all the time, we'd have no roads, highways, etc.

    Since we do, it is clearly a gross exaggeration to suggest that not one dollar will...
  24. Thread: OT Lead Pipe

    by JST
    Replies
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    Doc is assuming that the money will be 100%...

    Doc is assuming that the money will be 100% wasted. That is a central part of his argument. He could be partly correct, but I deny the ability of any government to be so good at wastage as to fail...
  25. Thread: OT Lead Pipe

    by JST
    Replies
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    7,246

    Funny how the excuses come out when the problem...

    Funny how the excuses come out when the problem is in poor areas..... or in areas where people do not look like the folks who decide.

    As for the bulldozers....... NOT REQUIRED. The bulldozers...
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