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  1. Thread: [email protected]

    by rhb
    Replies
    19
    Views
    1,363

    The best part of being a PhD level scientist is...

    The best part of being a PhD level scientist is that with a little bit of luck you are *always* a novice at whatever your are doing. Because no one has done that before. It's called "research".
    ...
  2. Thread: [email protected]

    by rhb
    Replies
    19
    Views
    1,363

    The word I used is "mensuration". M E N S U R A T...

    The word I used is "mensuration". M E N S U R A T I O N

    Sorry if you found that difficult.
  3. Who taught Sir Joseph Whitworth? I agree with...

    Who taught Sir Joseph Whitworth?

    I agree with Conrad and Lurk. It depends entirely upon the individual and the goal.

    Some people are incapable of learning from a book. Some people can read...
  4. Thread: [email protected]

    by rhb
    Replies
    19
    Views
    1,363

    [email protected]

    As my project to rebuild a mini-lathe as an instrument maker's lathe is unwelcome here I have started a list to discuss that and other machine tool related problems even as simple as alignment of the...
  5. Paolo, If you bolt a machine part to a support...

    Paolo,

    If you bolt a machine part to a support e.g. an odd shaped section which requires putting some frame around it to provide a secure means of holding it, the bolt will exert a bending moment...
  6. From "Machine Tool Reconditioning" by Edward F....

    From "Machine Tool Reconditioning" by Edward F. Connelly

    260175

    QED
  7. Kinematic support of major machine tool components

    For those not familiar with the term, in this instance a kinematic support is one which imposes no stresses on the part other than gravity. The concept was first formally described by James Clerk...
  8. Replies
    32
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    1,768

    I'm sorry, but I'm out of here. I asked for a...

    I'm sorry, but I'm out of here. I asked for a reference to a good technical book. In response all I've gotten is pure BS. In short, you are as useless as the denizens of the ...
  9. Replies
    32
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    1,768

    Where can I get dimensional information about the...

    Where can I get dimensional information about the bearings used in the best makes? Are you willing to measure some and post the data?

    I want to learn the mechanical engineering of hydrodynamic,...
  10. Replies
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    1,768

    The references I've found suggest that it was...

    The references I've found suggest that it was shown by experiment that the Schiele curve aka traktrix does not have the properties claimed. However, that doesn't mean that such an approximation is...
  11. Replies
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    1,768

    Southbend made the 9" lathes with plain iron...

    Southbend made the 9" lathes with plain iron bearings as a cost cutting measure during the Depression. They performed very well.

    Hardened steel on hardened steel demands very high accuracy and...
  12. Replies
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    1,768

    This is for a metal lathe, so sensible materials...

    This is for a metal lathe, so sensible materials are bronze and steel.

    The issue I'm trying to resolve is the best shape for keeping the axis of rotation constant as the bearing surfaces wear and...
  13. Replies
    32
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    1,768

    Reference book on plain bearing design?

    Does anyone know of a good treatise on plain bearing design that treats bearings which must take both radial and axial loads?

    Much to my dismay, a survey of 10 ft of machine design books failed to...
  14. Replies
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    15,715

    Wayne Moore's book is a masterpiece. Prepare to...

    Wayne Moore's book is a masterpiece. Prepare to be amazed.

    A precision level vial (e.g. 4"/2 mm) will measure flatness to 20 millionths per inch without the need for 3 plates.

    A plate ground...
  15. Replies
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    2,076

    This is the super major league

    When Rita and Katrina trashed a large number of platforms, a company made a very low cost (under $1 million IIRC) vessel out of a some barges that could lift a platform off the seafloor and move it...
  16. Replies
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    2,076

    I was mistaken about the Jack/St. Malo FSPO, it's...

    I was mistaken about the Jack/St. Malo FSPO, it's a semisubmersible, not a ship. I couldn't find any information about the risers for it. I included a picture of it with some houses for scale to...
  17. Replies
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    2,076

    How much money do you have? The day rate for...

    How much money do you have? The day rate for these things is well over $1 million. This crane is probably $2 million/day.

    IIRC A 13,000 MT single derrick crane was commissioned 2-3 years ago.
    ...
  18. Actually not a bad search function, but it didn't...

    Actually not a bad search function, but it didn't find what I wanted to know which is aligning a female surface. Some got close, but didn't shwo enough detail to be clear. I'll try some other...
  19. Measuring the alignment of a slide dovetail with the adjacent face.

    If you want to measure the parallelism of a dovetail with the adjacent face of a slide, how do you do it?

    I've got an idea for how, but I'd like to hear what others do. I'm interested in tenths...
  20. Replies
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    1,781

    What are you trying to test? A 2" 2mm level...

    What are you trying to test?

    A 2" 2mm level vial from China is about $12. With some copper foil tape and about $15 in electronics you can read to 0.02 arc seconds.

    Take a look at this thread...
  21. Replies
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    If you can measure the errors accurately, then...

    If you can measure the errors accurately, then hand lapping with silicon carbide (wet or dry) sandpaper will remove material *very* quickly. Face off some round flat plates of various diameters and...
  22. Replies
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    I spotted the slide and then measured it with an...

    I spotted the slide and then measured it with an indicator and surface plate. It appears to be within a half thou except that the sides are not parallel in the vertical direction. I did not attempt...
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    Measuring cross slide dovetail alignment with side

    After considerable study, I concluded that the cross slide is my best choice of datum. Once it is true on all faces and the dovetails, I can use it to spot the saddle and square the saddle to the...
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    Richard, Thank you for helping to keep the art...

    Richard,

    Thank you for helping to keep the art alive. BTW I read your thread on 3 point support. Very good.

    On the question about where to place work supports, as close to the three centers...
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    Scraping a lathe to the limits of mensuration

    I'm a retired research scientist. But long before I became a scientist I was hopelessly perverted by C.L. Stong's volume of "Amateur Scientist" columns from "Scientific American".

    In the late...
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