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Type: Posts; User: specfab

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  1. Replies
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    135

    Thanks for the info. I assume you are saying:...

    Thanks for the info. I assume you are saying:
    Disconnect capacitors, reconnect where needed to bypass the caps, start converter, then check output voltages with converter in operation(?)
    Yes, the...
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    135

    RPC + 3-phase transformer

    I am using a 10 HP rotary converter that is providing pass-thru voltage of about 240V on two legs, and something on the order of 265V on the generated leg. This is a commercial converter that I...
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    534

    Also my preferred method for making multiple...

    Also my preferred method for making multiple plastic disks. Stack 'em on a mandrel and let the corners fly.
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    534

    I think Delrin is going to be much too hard to...

    I think Delrin is going to be much too hard to allow that to work well, at what appears to be 1/8" thkns. You will likely start melting the material before achieving a complete cut. OTOH, using a...
  5. I would think that any machinist that is aware...

    I would think that any machinist that is aware that the mill they are using has ballscrews would be able to make appropriate compensations in technique. Like, don't let go of the crank handle while...
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    +1 on Dualkit's response. Also, use a fresh piece...

    +1 on Dualkit's response. Also, use a fresh piece of firmer backup material for each cut. Put a sheet of Delrin on top of the wood, and find a fresh location for every cut.
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    The RPM is quite high for a csk operation IMO,...

    The RPM is quite high for a csk operation IMO, for a machine with no real radial rigidity on the spindle. You may do better with a single-flute csk, and as you note clamping the work. I wouldn't...
  8. I always run a vacuum cleaner when doing plastic...

    I always run a vacuum cleaner when doing plastic work on the lathe, bought one especially for dry plastic chip gathering only. It's the only way to keep control of the chip string. Works very well...
  9. You should try the PBS Newshour. It had the...

    You should try the PBS Newshour. It had the "Biden Fall" at the top of the news.
  10. I don't know if any of you have followed the...

    I don't know if any of you have followed the attempted politicization that was in progress within the last year under the previous administration, but there was some restructuring occurring in the...
  11. Replies
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    Yes, that's the basic gist of plastics...

    Yes, that's the basic gist of plastics manufacturing certification. I am speculating, but I imagine that the difference in certs between metals and plastics is most likely a function of the...
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    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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    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...
  14. 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...
  15. 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...
  16. 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...
  17. Replies
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    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...
  18. 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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    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...
  20. 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...
  21. 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...
  22. 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...
  24. 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...
  25. 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...
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