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  1. You've described a manual star-delta starter.

    You've described a manual star-delta starter.
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    *Slow clap* :Yawn:

    *Slow clap*
    :Yawn:
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    295

    Dumore 5G parts interchangability

    I'm looking at a Dumore No. 5G tool post grinder a fairly low price. It includes some stones and pulleys, but is missing two of it's three interchangeable spindles. I'm wondering if I can obtain...
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    I.D.ing Greenfield threading dies

    Picked up an old Greenfield pipe threading kit a while back for a steal of a deal. Almost entirely complete for 1/2" NPT through 1-1/2", except the dies and collar for 1" pipe are missing.
    ...
  5. Moisture is the biggest enemy of circuit boards. ...

    Moisture is the biggest enemy of circuit boards. Contacts for card edges, switches and IC sockets will corrode. Makes for intermittent connections that can be a royal PITA to track down.

    Heat...
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    Williams - Made In USA 585 1/2 Not sure...

    Williams - Made In USA
    585
    1/2

    Not sure if it's the one that shipped with the machine, but it's the one I found in the cupboard next to it during rescue. No open end - square "box" end only.
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    What kind of drive motor? Permanent magnet or...

    What kind of drive motor? Permanent magnet or wound rotor? Shunt/series wound or separately excited? Armature or field resistors?

    Shorted field resistors on a field-controlled motor will make...
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    Awful deep hole for a regular twist drill. Must...

    Awful deep hole for a regular twist drill. Must be pushing 4 inches or so?

    Deep hole... Tight tolerances...

    Maybe a gun drill would be better suited to this work?

    Else maybe redesign the...
  9. Could be that your spindle bearings could use...

    Could be that your spindle bearings could use some shim adjustments too. Excessive spindle deflection can have this effect.

    Take pictures before you remove any shims so you know how to return it...
  10. Re-grind the parting blade to ensure it is sharp,...

    Re-grind the parting blade to ensure it is sharp, slow down the spindle speed and check for anything which could be reducing the rigidity of your tool. Make sure your carriage is locked down and...
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    If there is no other equipment on that pole aside...

    If there is no other equipment on that pole aside from two bare MV conductors, two insulators and the sound is definitely coming from the pole, then a faulty/dirty insulator is suspect. I'd stay...
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    As long as the motor was oiled on a regular basis...

    As long as the motor was oiled on a regular basis and taken apart for cleaning & brush/commutator inspection once in a while, it should run pretty much forever. These old repulsion start motors were...
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    This is typical of old repulsion start motors. ...

    This is typical of old repulsion start motors. Lots of play in the thrust bearings so they can find magnetic center.

    Bearing replacement is unlikely unless you intend to turn your own - these...
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    That's been in the front of my mind too, but...

    That's been in the front of my mind too, but remember - this is an early R.O.C. 244 from 1948, not a modern 240, 270, 325, 340, 350, etc. The 1262 crank that it takes was outmoded some time between...
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    Well, here's where I stand on the matter. The...

    Well, here's where I stand on the matter. The way I see it I have three options. I can either:

    1.) Use the pump as-is on a temporary basis and make plans to produce a suitable replacement crank...
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    And as far as determining the correct mass of the...

    And as far as determining the correct mass of the counterweights - con-rod and piston assembly plus the calculated mass of the crank pin, no?

    Although that could get tricky because of the...
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    Stupid question time. Pardon me if I'm going...

    Stupid question time. Pardon me if I'm going down a rabbit hole as I just woke up.

    Is there any reason I can't just turn and grind my own replacement crank either out of a single piece of 1144...
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    The crack is allegedly around the entire...

    The crack is allegedly around the entire circumference of the shaft. I intend to test it myself with some UV-reactive penetrating dye - to not only confirm the assessment, but also to positively...
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    What sort of fastener are we talking here? I...

    What sort of fastener are we talking here? I imagine I'll want as small a diameter bore as possible to achieve a healthy compression preload without excessively compromising the remaining undamaged...
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    Here are some pictures of the alleged crack: ...

    Here are some pictures of the alleged crack:

    334621334622334623

    I don't see a damn thing. If it held up to the hydraulic press used to straighten it out, it ought to hold up to spinning in...
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    My only concern is that the thing was fluxed...

    My only concern is that the thing was fluxed after straightening, so I don't know if it was there before I took it to the shop or not.

    On the plus side, the crack is invisible to the naked eye. ...
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    Think I should just take it back to the shop and...

    Think I should just take it back to the shop and tell them to grind it anyways and accept the risk?

    Would it be possible to simply bore the crank and expand it for a shrink fit extension without...
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    Cracked crankshaft repair?

    I got the worst possible news earlier today from the crankshaft shop grinding my compressor crank. Magnafluxing revealed a crack in the flywheel-side bearing seat, about half an inch outboard of the...
  24. The MVM weighs around 1200lbs from what I can...

    The MVM weighs around 1200lbs from what I can gather.

    I grew up on an R-8 mill of similar displacement. That one was a Chinese MSO with Chinglish scrawl all over it - and it was plenty capable...
  25. Are the pictures not loading on your end or...

    Are the pictures not loading on your end or something, bud? :skep:

    Definitely a mill, and one with much more table space & work envelope than my #4, which is my motive for trying to get away from...
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