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Type: Posts; User: Conrad Hoffman

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  1. So unime, what's your position on copyrights?

    So unime, what's your position on copyrights?
  2. Required reading is Foundations of Mechanical...

    Required reading is Foundations of Mechanical Accuracy, followed by Precision Machine Design.

    Publications at Moore Tool: Precision Machining Technology, Precision Tools...
  3. Microlution made mills specifically for...

    Microlution made mills specifically for micromachining, but they were bought out and ceased production of that type of machine. They were over $100k. They did a lot of research on the matter and had...
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    Wow, nice. We're pondering a mill purchase and...

    Wow, nice. We're pondering a mill purchase and most of our tapped holes are down in that region. Thanks.
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    Minimum size for rigid tapping?

    What's practical? Do people routinely do stuff like M1?
  6. Wonder how they do in snow?

    Wonder how they do in snow?
  7. One usually owns a lathe before a grinder.

    One usually owns a lathe before a grinder.
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    Very true! Carbide can be extremely sharp, but...

    Very true! Carbide can be extremely sharp, but not using a green wheel. Something like the diamond wheels on an Accufinish grinder is needed, or a diy lapping disk.
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    IMO, surface grinding a plane sole is difficult...

    IMO, surface grinding a plane sole is difficult and to be avoided. Lapping it is a fools errand unless the error is tiny. Scraping makes sense and I find it holds the paraffin I like to lube the sole...
  10. Oh hell yeah. I can't think of a machine where...

    Oh hell yeah. I can't think of a machine where you don't need safety glasses. Set that kid straight.
  11. Grind the sides of a small monolith on the...

    Grind the sides of a small monolith on the surface grinder. If it (and you) are any good, it will be near dead parallel. Check it on the surface plate and scrape if necessary. Then, use the ball in...
  12. Quite a collection, though a surprising amount of...

    Quite a collection, though a surprising amount of rust and neglect. If you do an image search on 'Waterloo Iowa floods' it might explain some things.
  13. I don't remember which type is prone to this, but...

    I don't remember which type is prone to this, but watch out for small voids running down the center of rounds.
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    We added microscopes at work but mostly don't use...

    We added microscopes at work but mostly don't use them. Too much of a PITA. We mostly resort to decent hand lenses. A surplus 1.5" diameter achromat with a focal length of about 100 mm is a good...
  15. I've been disappointed with every printed part...

    I've been disappointed with every printed part I've ever seen, either from a cosmetic, structural or tolerance standpoint. But, they don't call me Hostile Hoffman for nothing.
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    In my little world, before I test or investigate...

    In my little world, before I test or investigate something, I ask myself, "What will I do with the information when I have it?" If the answer is "nothing" or "I don't know", then the test or...
  17. I thought I wouldn't use a small surface grinder...

    I thought I wouldn't use a small surface grinder that much, but it turned out I use it all the time and couldn't live without it. No room for a shaper and desirable ones aren't as cheap and available...
  18. I doubt any individual or company can predict...

    I doubt any individual or company can predict what will happen in 14 years.
  19. Everyplace I've worked has had a Grob. Can't go...

    Everyplace I've worked has had a Grob. Can't go wrong with a good used one but a bit of a PITA if you have to do a serious rebuild.
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    Hell would freeze over before I gave eBay or...

    Hell would freeze over before I gave eBay or Paypal my bank info. If you use a different account it should probably be with a different bank than your main accounts. And be careful with your credit...
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    Not me. I've been into photography since about...

    Not me. I've been into photography since about age 13. My basic persona is more observer than participant. I took shop classes in junior high, the usual sheet-metal and tinners rivet stuff, plus some...
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    Well, high school class of '72, probably also...

    Well, high school class of '72, probably also when the photo was taken. Born in '54. Our high school in Vermont was really something because it catered to both the college bound and the trades. We...
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    Back in high school shop...

    I was going through some old negatives I shot in high school. We had a big school that catered to just about everything, including a nice machine shop. Apparently we even had a shaper, though I had...
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    Is there any way to do cut knurls? They'll be...

    Is there any way to do cut knurls? They'll be easier and look better.
  25. It just doesn't look that bad other than being...

    It just doesn't look that bad other than being ugly. Lots of bearing area left. I'd stone it, clean the heck out of everything, and try it. Nothing to lose.
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