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  1. Replies
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    595

    Thanks for all the info -- I'll sort through and...

    Thanks for all the info -- I'll sort through and see what works.

    Regarding the Alina, I also think they may have had some Compac connection. I have a Compac in the shop that is .0001 resolution...
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    595

    DTI .0001 or better with long tip

    Any recommendations for specific models of dial test indicators that are long tip versions (approx 1.5" tip length) and .0001 or better resolution? Those two parameters don't seem to be together in a...
  3. Keep in mind that "Delrin" is a specific...

    Keep in mind that "Delrin" is a specific trademark name (DuPont's product). Buying Delrin (TM) carries a premium, whereas black acetal as a generic product may also reduce the cost (if you don't...
  4. Miniature/medical type lathe part - looking for shop to make

    I have a part that I need to get made by a shop (or "a guy") that is used to very small lathe parts. A friend of mine is in the middle of a space-device hardware set, and there is a small washer-type...
  5. Take a look at this chart, and you'll need to...

    Take a look at this chart, and you'll need to consider all the sources of error involved, including the chart tolerances shown for the ring gages:

    Ring gage and Master Disc Tolerances per B89.1.5...
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    645

    Another vote for tablesaw for 3/32 brass. It...

    Another vote for tablesaw for 3/32 brass. It would be my preferred method, and as mentioned, a negative-rake, triple-chip tooth grind. Readily available at Home Depot typically, or "other fine...
  7. If you are looking for single-digit micron...

    If you are looking for single-digit micron measuring accuracy, you are in air-bearing rotary table territory. I don't think a "standard" rotary table made for machining will give you this level of...
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    4,128

    Hello, John -- It appears that Marshall Tool and...

    Hello, John -- It appears that Marshall Tool and Supply has become PTSolutions. You can use www-dot-marshalltool-dot-com and get there. PTSolutions seems to carry SCA chucks. Not known if they still...
  9. Milland is right on. Your drawing tolerances or...

    Milland is right on. Your drawing tolerances or part specifications drive the measuring techniques, and your own knowledge and calculations of the thermal effects of handling or environmental...
  10. The K&E and Brunson alignment telescopes are...

    The K&E and Brunson alignment telescopes are pretty similar, and as I recall, this Taylor Hobson unit is conceptually similar but smaller. I can say from direct experience that the cover slip...
  11. Like Mechanola's post,I might be inclined to try...

    Like Mechanola's post,I might be inclined to try some thing like an alignment telescope and a fold mirror, with either sample rings for edge matching, or a chrome-on-glass measurement scale (such as...
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    Using a VFD to balance output of RPC??

    I have been having some difficulty with a Tree CNC machine, and in the process of sorting that out, a question crossed my mind:

    Can a VFD be used as a power smoothing/balancing device for the...
  13. Typically a new ballscrew with some amount of...

    Typically a new ballscrew with some amount of preload shouldn't have any measurable backlash, but it's generally a fight between how much preload vs. what the force is required to move the load...
  14. RPC turn-on tripping a machine shunt trip braeker

    I posted a problem a few days back in CNC forum regarding my issue with a Tree Journeyman 325 not being able to get out of E-Stop mode and power the servos. In doing some further checking, I see that...
  15. Thanks, all -- the link supplied by Hardplates...

    Thanks, all -- the link supplied by Hardplates looks to be exactly the issue (but very slightly different word arrangement on display); whether the cause and solution are identical remains to be...
  16. No-Servo Problem -- Tree Journeyman 325 w/Delta Dynapath 20

    I was using the machine yesterday, started and ran OK for a short piece of work. Today, I powered the machine, turned on the controller, everything looks fine (no errors, diagnostics passed), went to...
  17. Replies
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    1,109

    New lathe choice - Victor vs. Sharp

    I am planning to buy a new lathe for the company, for prototyping and small qty work, modifications, etc. Been looking at something a little better than the typical $4-5K Asian commodity junk, and it...
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    This sounds like one of (3) possibilities: 1. ...

    This sounds like one of (3) possibilities:
    1. An add-on or optional package that you could buy with a CMM or some other sort of automated inspection system,
    2. An add-on or optional software...
  19. RE: the phenolic material -- As was previously...

    RE: the phenolic material -- As was previously noted, paper-based material will be the most uniform in appearance after machining, and a good-quality XXX grade will be the best in that regard. This...
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    Just a side note: You may want to check that...

    Just a side note: You may want to check that sine bar with a Geiger counter, in case it actually got used for setups in machining the facets on U-235 or plutonium sphere segments. That work may have...
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    Semt you a PM with some sizes. The 6mm is on list...

    Semt you a PM with some sizes. The 6mm is on list if still available.
  22. Replies
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    3,268

    You have gotten good advice above. Keep in mind a...

    You have gotten good advice above. Keep in mind a couple of things:
    1. A 3-jaw chuck is a convenience tool, and not designed for highest precision. I purchased a new (old stock) 3-jaw chuck about...
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    Thanks to all, especially elitts for specific...

    Thanks to all, especially elitts for specific info. I had checked the Vintage Machy site and OWWM, looked at machine registry, but didn't find anything comprehensive to describe the Powermatic scheme...
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    Powermatic model 66 saw serial numbers

    I went to look at a Powermatic 10" table saw for sale, which seems to be a model 66. I am not that familiar with Powermatic machines (I have a Unisaw), but I was hoping to be able to figure out the...
  25. It has been a mystery forever to me why this...

    It has been a mystery forever to me why this happens sometimes and not others, and always seems resistant to rational analysis and solution. I often use a backing plate in doing small...
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