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Type: Posts; User: Conrad Hoffman

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  1. You're going to have to add weight opposite the...

    You're going to have to add weight opposite the handle. I'd put a shaft through the hole and rest it on rails, just like balancing a grinding wheel. I don't like two handle wheels, but adding an...
  2. At work we always have chucks mounted on 1/2"...

    At work we always have chucks mounted on 1/2" stub arbors, maybe 7/8" long. Easy to get in and out.
  3. The High Speed Hammer Co. was here in Rochester....

    The High Speed Hammer Co. was here in Rochester. I remember driving by the place and every time I saw the sign I'd think, "Man, it sure must be loud in there." I think they might still exist with a...
  4. I've done something similar using a cast iron lap...

    I've done something similar using a cast iron lap and diamond rolled into the lap. This is very different than lapping with a slurry. It's old school but it works. Also see American Lap Company
  5. Oil in the lungs is really bad. Almost like...

    Oil in the lungs is really bad. Almost like vaping! Buy the right stuff and quit messing around.
  6. An oldie but goodie- have a look at the 592 and...

    An oldie but goodie- have a look at the 592 and 733 video amps.
  7. Designers that design too close to "doable"...

    Designers that design too close to "doable" usually end up with expensive designs and high failure rates. Start with what's typical for a given process, then add a safety factor. If the answer isn't...
  8. Backlash is of little concern. I'd get a wedge...

    Backlash is of little concern. I'd get a wedge type AXA QC toolpost, Phase II plus a bunch of tool holders from CDCO. Don't extend the tooling and try to keep the cutting edge within the envelope of...
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    Thanks- I've always found the Hardinge metric...

    Thanks- I've always found the Hardinge metric threading setup a poorly documented mystery. This helps a lot.
  10. NIST has a bunch of stuff related to uncertainty...

    NIST has a bunch of stuff related to uncertainty including some kind of on-line calculator. Google will turn it up if you do a site specific search. An example is...
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    The crack might or might not have anything to do...

    The crack might or might not have anything to do with the fall and could have been there since the beginning.
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    Thanks. Surprised not more replies. I have some...

    Thanks. Surprised not more replies. I have some import punches that have what appears to be a huge included angle, yet they work fairly well. I usually have no internal taper, just an angle on the OD.
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    Just a note on vacuum chucks- you can suck as...

    Just a note on vacuum chucks- you can suck as hard as you want, but the most force you'll ever get is 14.7 pounds per square inch, the result of atmospheric pressure. A 50 HP vacuum pump can't make...
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    Hole punch angles

    I often find myself making hole punches for things like gaskets and paper templates. Are there any generally accepted angles for sharpening that both cut well and hold up well?

    edit- I'm talking...
  15. IMO, 90% of that stuff is too big to be of any...

    IMO, 90% of that stuff is too big to be of any use in a smaller setting. The Hardinge could be nice for you, and it looks like it has a conventional cross slide and compound at the edge of the photo....
  16. Thread: 19 tpi

    by Conrad Hoffman
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    Any time I need a change gear for my Logan, it...

    Any time I need a change gear for my Logan, it gets made out of Delrin. They work great, last near to forever and are much nicer to the gear cutter.

    268385
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    Nice tap! I could have single pointed the parts I...

    Nice tap! I could have single pointed the parts I needed, but it would have taken me longer to grind a tool for that, than to make the tap. I don't have any small ID threading tools. Should, but...
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    I've actually had better luck with the flats than...

    I've actually had better luck with the flats than gullets, but then I don't have an angle grinder. I was skeptical until I tried it, but the chips come out the front just fine. Works on steel too.
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    Depends on how much use and how good it has to...

    Depends on how much use and how good it has to be. I needed an M5-0.5 last night with no time to buy one. Took me maybe 20 minutes to make, including the time to change the change gears on the lathe....
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    The one I want to know about is the one in my...

    The one I want to know about is the one in my Boyer-Schultz grinder. It has a large pretension, no gap and no holes or clearance at the ends of the cut. I question the desirability of using one...
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    I'd buy 6" Mitutoyo because nothing else I've...

    I'd buy 6" Mitutoyo because nothing else I've seen is as reliable or has as good battery life. They just work. 6" is cheaper than 8" and most people probably don't need 8". Depends on what you make....
  22. You'll find some solenoid designs use a cone on...

    You'll find some solenoid designs use a cone on the end of the plunger that engages a cone on the magnetic structure. Helps things a bit but IMHO you need something entirely different like a voice...
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    I think there's a free cut version and regular....

    I think there's a free cut version and regular. Try to get the free cut if the customer's OK with it.
  24. Even free seems way too high when you consider...

    Even free seems way too high when you consider the amount of work needed to fix them up. They're large, so even more work than smaller machines.
  25. My floor changes with the seasons. Check the...

    My floor changes with the seasons. Check the twist first.
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