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  1. Replies
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    The dimensions for body and thread are wrong for...

    The dimensions for body and thread are wrong for Derbyshire WW or Magnus-Elect collets.

    Webster-Whitcomb (WW) body is 8 mm and thread is about .270"-40 TPI vee form.
    Magnus-Elect body is 10 mm...
  2. Hardinge claims to stock 5C collets in increments...

    Hardinge claims to stock 5C collets in increments of .001 inch, but the 3 mm collet will be cheaper, especially if you get an import. I have a Hardinge .300 inch 5C collet I needed for a particular...
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    253

    The 1020 and 1030 have standard L0 spindles with...

    The 1020 and 1030 have standard L0 spindles with rectangular slots in the nut for the hook spanner.

    But the 918 has a special small L000 spindle, not listed in the long nose specs. So you would...
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    Yes, I have one in my collection. Each clock...

    Yes, I have one in my collection. Each clock uses one key to open it to change out the paper record of the watchman's rounds. That key was secured in the boss' office and never given to the...
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    It would be easy to see Lord Hardinge keeping the...

    It would be easy to see Lord Hardinge keeping the knife in his (fox) hunting kit in 1926. Or, it would be the thing to carry for a mounted military officer. The Brits here might know better, but I...
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    If the name is hand engraved, it would indicate...

    If the name is hand engraved, it would indicate an owner rather than a maker or an advertising item.

    The Hardinge brothers (Franklin and Henry H.) were Canadian and moved to Chicago in 1890. They...
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    Maybe it is English. They like the carriage feed...

    Maybe it is English. They like the carriage feed wheel on the right side of the apron. And it will cut 12 threads per inch, but not 13. In the USA, very common 1/2 inch UNC threads are 13 TPI, but...
  8. Replies
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    Most engraving tools these days have 1/8"...

    Most engraving tools these days have 1/8" straight shanks, so no use in a 15 J0 chuck. I did notice that Sphinx has tiny engraving tools, but their spotting drills are probably better suited to...
  9. I thought all 5-40 taps have a .141 inch shank. ...

    I thought all 5-40 taps have a .141 inch shank. Please explain what you mean by reduced shank.

    What tapping fluid are you using?

    Larry
  10. Replies
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    You could use an Albrecht 30 J0 chuck on a...

    You could use an Albrecht 30 J0 chuck on a sensitive adapter. They are rated to close to .015 inch, about a 78 or 79 drill size. The 15 J0 chuck is rated to close to .008 inch. I have drill bits...
  11. Replies
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    I have expanding mandrel sets from KO Lee (USA)...

    I have expanding mandrel sets from KO Lee (USA) and a set made in Germany. Any of these sets can do either inch or metric bores within their diameter range. Last I looked, these are very expensive...
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    I suggest you visit the site and wait for a...

    I suggest you visit the site and wait for a freight train to approach. Then lie down on the ground and pretend you are a machine tool. See what you think about how solid the ground feels and...
  13. There are companies that sell round steel sleeves...

    There are companies that sell round steel sleeves with square holes broached through them. Try MSC or your favorite mill supply company. The sleeves can be cut to length and silver brazed into a...
  14. "Or top slides - when did they first appear?" ...

    "Or top slides - when did they first appear?"

    American Watch Tool Co. made triple slide rests with an 1875 patent date for their watch lathes.

    Offhand, I can quote the Rivett Precision 8 engine...
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    I put the change gear information into excel...

    I put the change gear information into excel spreadsheets. Here are excerpts of the gear information from each one.



    SCREWCUTTING IN THE HARDINGE CATARACT NO. 3 LATHE


    GEAR CHART FOR USE...
  16. The 5/16" collet draw bar would suggest a collet...

    The 5/16" collet draw bar would suggest a collet thread of around .250 to .275 diameter. There are several watch lathe collets threads within that range, some common and some not. A common pitch is...
  17. The triangular plate was attached by the dealer...

    The triangular plate was attached by the dealer that sold the machine. The lathe maker's name may be somewhere else.

    There should be more gears with teeth the same size as the ones on the lathe....
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    And with the camera held the other way? Larry

    And with the camera held the other way?

    Larry
  19. Replies
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    These sites should be of help. Sheldon Lathes...

    These sites should be of help.

    Sheldon Lathes

    Sheldon Machine Co., Inc. - Publication Reprints | VintageMachinery.org

    Larry
  20. You can make a roll by shortening a steel dowel...

    You can make a roll by shortening a steel dowel pin. The roll has to be free to move, so no oil or grease on it.

    Larry
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    Perhaps you could get free expert advice from...

    Perhaps you could get free expert advice from Sandvik, who would be happy to sell you some drills.

    Larry
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    985

    The dovetail bed turret has a single clamp,...

    The dovetail bed turret has a single clamp, tightened with a hex key. Someone made a capstan handle hex key for convenience. Maybe it is permanently attached to the screw. The back of the bed has a...
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    It could be worse. That model slide rest often...

    It could be worse. That model slide rest often has the tool post T-slot broken out. Actually, you can't tell from the pictures, so maybe it is.

    Larry
  24. Yes, a key is needed to keep the collet from...

    Yes, a key is needed to keep the collet from turning while tightening and loosening the draw bar. Friction on the tapered part of the collet keeps it from spinning once the collet is tightened on...
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    Model G is the slide rest, not the lathe. The...

    Model G is the slide rest, not the lathe. The lathe is either a DSM59 or a DV59, the first model with step pulley drive, not the improved 1960 model. It is missing the tailstock and the lever cross...
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