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  1. Replies
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    Feynman, Just two quick comments. Precision...

    Feynman,
    Just two quick comments.
    Precision level vials are relatively inexpensive (< $100) and extremely useful. Something I strongly suggest you add to your toolbox.
    To measure the twist you...
  2. Have you considered using a VFD instead? Being...

    Have you considered using a VFD instead?
    Being able to momentarily change spindle speed without stopping and changing gears and tuning the speed to reduce vibrations and chatter are some of the...
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    Just a couple of quick considerations. First,...

    Just a couple of quick considerations.
    First, making a small boring bar is even simpler than a D=bit: you can free-hand it and the only critical part is to grind and stone a sharp edge and have...
  4. Magnets are generally rather fragile. I'm afraid...

    Magnets are generally rather fragile. I'm afraid that your solution wouldn't work great with anything well seated.

    Paolo
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    I want to stress what Milland said: such long...

    I want to stress what Milland said: such long prism is almost as rigid as an overcooked spaghetti. Dennis Foster's 36" is a good compromise between a regular straightedge and a true camelback one....
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    I suspect that you're dealing with...

    I suspect that you're dealing with peening/compression stress. Generally, the stressed part is convex, like the top of the table of a milling machine.
    Scraping material off the area that could have...
  7. I think the first consideration is about an...

    I think the first consideration is about an unbiased evaluation of the wear of the ways, etc. and availability of other machines in gair shape.
    Given that the gearbox and spindle are in oil bath...
  8. The main problem in using the very machine to...

    The main problem in using the very machine to measure distances is that such measurements are affected by part of the inaccuracies that got the part out of specs in the first place.
    If you could...
  9. Replies
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    Sebastian was later acquired by Sheldon, which...

    Sebastian was later acquired by Sheldon, which continued to produce only the gearhead models and you can find some more documentation on them searching for Sheldon.

    However, your description of...
  10. In most tailstocks the quill's leadscrew pushes...

    In most tailstocks the quill's leadscrew pushes out the taper.
    First, I'd check how shorter than necessary is (if you have a tool with the taper ending in a thread, you can thread in a headless...
  11. I suspect we managed to scare away Wrenchtech....

    I suspect we managed to scare away Wrenchtech.
    There have been many replies, many of them rather extreme in one way or the other. I'd like to put the problem hopefully in the right perspective.
    ...
  12. I might be wrong, but I believe there are a few...

    I might be wrong, but I believe there are a few models of South Bend mills, with the oldest being round-ram type and some of the latest having feeds at least on one of the axis.

    Pictures and specs...
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    I guess it doesn't make it economical to ship...

    I guess it doesn't make it economical to ship them to the US. Otherwise I'd take a few of them.

    My guess is that they were used for building/restoring micrometers or similar (40 TPI = 0.025"/rev)....
  14. Power hacksaw vise? Just guessing in base of...

    Power hacksaw vise? Just guessing in base of shape and description.

    Paolo
  15. Mark, Perhaps, you should try again with a more...

    Mark,
    Perhaps, you should try again with a more reasonable title for your thread: how to "reverse-engineer helical gears".
    As far as I understand, there are way too many variations of head designs,...
  16. Archie Cheda covered the topic of...

    Archie Cheda covered the topic of reverse-engineer an helical gear, in order to make a duplicate as part of the thread on his K&T (if the link does not bring you to the right post, the discussion...
  17. Thread: Wade 8a #407

    by Paolo_MD
    Replies
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    11,749

    If I recall correctly, it is rather common on...

    If I recall correctly, it is rather common on Swiss made lathes, like old Schaublin to have a "PTO" either as motor with shaft protruding at both ends, or as part of the countershaft. It was used to...
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    That's an amazing job! Thanks a lot, Dee! ...

    That's an amazing job!
    Thanks a lot, Dee!

    Paolo
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    If it is a cone-head model, you can move the...

    If it is a cone-head model, you can move the carriage toward the tailstock, remove the leadscrew and rods brackets at the tailstock end, support the leadscrew and rods (with straps or propping up...
  20. I keep not following you: first, you state that...

    I keep not following you: first, you state that one of your goals is to build a machine to automate scraping. And now you discount possible already-existing alternatives of scraping as expensive? How...
  21. Unless the motor is running at very low speed...

    Unless the motor is running at very low speed (judging by the diameter, unless it has a gear reduction, it doesn't look a 8- or more pole motor), probably it is driving the spindle way too fast for...
  22. I think using scales, hydraulic jacks with...

    I think using scales, hydraulic jacks with pressure gauges, etc. could be a good idea to identify three points with equal weight distribution, especially if you need to achieve levels of precision...
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    That looks really gorgeous! Do you need to...

    That looks really gorgeous!

    Do you need to borrow any other tool? ;-)

    Thanks!

    Paolo
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    Generally, VFDs don't like anything between them...

    Generally, VFDs don't like anything between them and the motor (singular): before learning the hard way, make sure that your VFD is a special one that can run multiple motors of different size at...
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    speedfreak24.7 I don't want this thread to...

    speedfreak24.7
    I don't want this thread to degenerate and you to make a fool of yourself more than necessary.

    Generally, for lapping and grinding at low speed with fine abrasives electroplated on...
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