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Type: Posts; User: specfab

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  1. Replies
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    I agree with both Erich and Mechanola; you could...

    I agree with both Erich and Mechanola; you could more easily have a coil spring (a coil-wound torsion spring) do the job, OR find some flat spring design formulae, say in Machinery's Handbook or in a...
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    just acquired Harig 612 automatic

    We just bought a few items at auction, including a Harig 612 Automatic surface grinder. I will need to move this and other equipment from SF Bay area to southern AZ, and want to get any...
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    Gear standards - JIS B 1702

    I am looking for specific tolerance info that is apparently shown in the JIS B 1702 standard for gear manufacturing. I am hoping for some specific numbers that are apparently resident in this...
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    Sure, I think it's a great idea. We should be...

    Sure, I think it's a great idea. We should be careful about allowing self-written obits, though, in case someone decides to make themselves an instant legend, without any effective criticism that can...
  5. Just a note "in case": I set up a steady rest...

    Just a note "in case":
    I set up a steady rest for my 12" Clausing lathe a couple of years back (converted a 6900 model to a 5900 bed interface), and put ball-bearing support fingers on it. I...
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    I have also had difficulty getting results,...

    I have also had difficulty getting results, mostly from multi-word queries. It would be useful to have some sort of function to refine searches by exact word order, contains all words, etc. I thought...
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    Hmm. Guess I better look at my new one a little...

    Hmm. Guess I better look at my new one a little more closely. Bought the 30th edition sometime around the end of the past year; last one I bought was 23rd edition, about 30 years ago, it seems. My...
  8. McMaster-Carr's online info is fairly extensive...

    McMaster-Carr's online info is fairly extensive with respect to raw materials tolerances. That is usually my first quick stop for a material tolerance idea. That said, the tolerances ARE McMaster's...
  9. I agree with Jim Rozen's analysis. I have never...

    I agree with Jim Rozen's analysis. I have never had this happen with my Starrett calipers (.100"/rev) but it's more common with some older Mitutoyo calipers I have (.200"/rev). When that occurs, it's...
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    100% troll work.

    100% troll work.
  11. I have always used HPLC grade methanol as first...

    I have always used HPLC grade methanol as first choice for cleaning optics in my professional settings. Similar purity acetone is handy as well. For casual work at home, 91% IPA can be made to work...
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    Thanks for the feedback. I had hands on an...

    Thanks for the feedback. I had hands on an Okamoto in the very late 90's, after my (then) company set up a new shop, and bought some additional machines. It was something like 8x18 or 8x20, I seem to...
  13. This machine is somewhat less. Just your basic...

    This machine is somewhat less. Just your basic 20-yr old 2-axis turning machine, with incremental jog motion resolution to .00001 increments. The specs I pulled off of some Google info DO include "a...
  14. diamond turning machine - used/auction value?

    I am considering purchasing a used diamond turning machine at an auction. It's a Precitech 8" machine, about 20 yrs old,and I just wondered if anyone has any recent experience with the nominal value...
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    okamoto Linear-618B GrindX machine

    I am considering the item listed in the title, it is coming up for local auction soon. Any opinions on this Okamoto grinder vs. a Harig ball-way 618 machine? The Okamoto X-feed feels amazingly smooth...
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    Diamond saw blade (for glass) suppliers

    Anyone have experience and recommendations for high quality continuous-rim diamond circular saw blade suppliers? My application is for mounting on a Strasbaugh saw-grinder machine with 1.250" arbor,...
  17. Air dryer -- cycling vs. non-cycling, other?

    I am in the market for an air dryer, and would like to find out what opinions there are regarding:

    1. Cycling vs. non-cycling air dryers, what pros and cons anyone has seen.

    2. Whether there is...
  18. Thanks, all, for the inputs. As Ray Behner notes,...

    Thanks, all, for the inputs. As Ray Behner notes, the money-saving or salvage value isn't my interest, it's doing the task with minimum time investment. The parts will have a lot of work, and this...
  19. Best/fastest/least risky way to remove center slug on lathe blank

    I will have a task to make some lens cells from MIC-6, 1.125 thk x 8.5 OD, with a center bore about 6.22 ID. I would like to be able to remove the center slug as a chuck rather than turning it into...
  20. Regarding the OP's original question, I have...

    Regarding the OP's original question, I have nothing to offer. I can say a couple of things from my own historical and current experience:

    1. I use a small notebook and write down every...
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    I would take (2) of each size at that price;- ...

    I would take (2) of each size at that price;- I'll send you a PM with addtl. info.
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    Cast aluminum rod stock?

    I have some high-precision optics parts (lens cells, and related parts) to make or get made, that are in the 7.5 - 8.5" diameter range. They are rings, generally. I often make optics parts from MIC-6...
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    I'm in the round pin-diamond pin camp with...

    I'm in the round pin-diamond pin camp with others. When somebody showed me diamond pins about 30 years ago, it was a revelation. They help a LOT. for this sort of issue.

    Another perhaps minor...
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    Thanks to all of youse for generally confirming...

    Thanks to all of youse for generally confirming my "suspicions". As it turns out, the actual TPI info came my way during a telephone design review. It's a 3.75-12 4-start internal thread. I'm not...
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    multi-start thread callout

    I am going to need to supply a locking ring with some other parts that need to be built, and the locking ring currently has incomplete specs on the drawing for a multi-start thread. I need to get...
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