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Type: Posts; User: Conrad Hoffman

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    IMO, not tilting the wheel is a big problem. Not...

    IMO, not tilting the wheel is a big problem. Not even sure what kind of weird geometry you'll get, not matter how you dress it. A lathe makes a really crappy grinder compared to a grinder. That said,...
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    Nice taps! OTOH, I see this sort of job as an...

    Nice taps! OTOH, I see this sort of job as an opportunity to make money. Price it as needed and if the customer questions why it's so expensive, explain why. They can either change it or not.
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    I don't know anything about machine tapping, but...

    I don't know anything about machine tapping, but I do know that people have trouble assembling parts with formed threads if the crest has a significant V from low percentage. They get the screws...
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    The best thing is to choose a screw that works...

    The best thing is to choose a screw that works with the dials. As an example, micrometers typically have 50 divisions. They use a 20 tpi screw (pitch=0.050"/turn.) 20 tpi would work well with both...
  5. I think it's been proven that oil grooves and...

    I think it's been proven that oil grooves and holes to get oil to the center of a journal bearing don't actually do much, at least in a case like that. Any oil applied at the face will wick in and do...
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    AXA size works fine on a 200. FWIW, I rarely bore...

    AXA size works fine on a 200. FWIW, I rarely bore using the tool post. I have a block of metal with a hole that screws down to the compound and has a hole for the boring bar. You can't beat a block...
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    I mention this on my balancing page and even...

    I mention this on my balancing page and even included an MP3 sound clip so you can hear what it should sound like. The thing I don't know is what "odd" bond wheels sound like. Resin, rubber and other...
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    Thermite beat me to it. Amount of free hydrogen...

    Thermite beat me to it.
    Amount of free hydrogen on earth- zero.
    Energy density of hydrogen- lousy.
    Worst choice of energy carrier- pure hydrogen.

    Guru's Lair: Hydrogen Energy library directory
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    You can usually clean up the taper with a Morse...

    You can usually clean up the taper with a Morse taper reamer. Then file and stone the tool taper. IMO, if boring is slow, you don't have a stout enough boring bar! With the right bar and insert, I...
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    It has to be the OD, root, angle or pitch. Can...

    It has to be the OD, root, angle or pitch. Can you mark it up with a Sharpie and see what contacts when it stops?
  11. Since it's v-belt drive, I'd think it would take...

    Since it's v-belt drive, I'd think it would take very little to get it running. Worth it? Depends on what else you could get for a hundred bucks.
  12. IMO, the surface prep is more important than the...

    IMO, the surface prep is more important than the epoxy, though you want something decent. Here's one guide, but there are many:
    Surface Preparation Guide

    They tend to recommend rather nasty...
  13. Something that works great for that is the...

    Something that works great for that is the Accufinish low speed grinder. Wet, with the coarser wheel, fine if you need a better finish. Make a fixture so they are all finished to the correct length.
  14. When you need a hone, nothing else will do as...

    When you need a hone, nothing else will do as well. It will nickel and dime you to death because you'll never have the arbor or stones you need for a particular task. It will often sit unused for...
  15. No better ideas on how to catch them, but...

    No better ideas on how to catch them, but something easy to overlook. If you have typical kitchen counters, the toe kick board in front probably doesn't fully seal the opening. Feel up around the...
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    I'd also want to know how you'll check the work,...

    I'd also want to know how you'll check the work, what sorts of CMM, video scopes, gages and stuff are available. Do you have a profilometer? Do you work as easily with metric as US?
  17. These guys have a lot of Haas equipment and...

    These guys have a lot of Haas equipment and specialize in micro-machining. Maybe of interest- Machining Equipment | MICRO PRECISION PARTS MANUFACTURING LTD.
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    I'm more of a test equipment geek, so the other...

    I'm more of a test equipment geek, so the other article might be more practical, but here are my thoughts on the matter:
    Grinding Wheel Balancing
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    My knees are shot and I'd be filing some kind of...

    My knees are shot and I'd be filing some kind of disability action.
  20. "And yet it moves." Galileo Galilei

    "And yet it moves."
    Galileo Galilei
  21. IMHO, just looking at the part, it's an...

    IMHO, just looking at the part, it's an unreasonable tolerance. Customer needs to understand what's reasonable and come up with a better way if they really need that slot so close.
  22. It's a jacot pivot lathe. Google it!

    It's a jacot pivot lathe. Google it!
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    Hey, are you guys hiring writers or machinists?...

    Hey, are you guys hiring writers or machinists? He might well have natural ability and be pretty good as a machinist, not a writer. IMO, it's like real estate- location, location, location. Some...
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    That reminds me about lighting. You need good...

    That reminds me about lighting. You need good light to see what you're doing, plus a light or white surface behind to see the gap between the wheel and work.

    I think I've heard of people running a...
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    If the wheel isn't perfectly balanced, a...

    If the wheel isn't perfectly balanced, a non-rotating and rotating wheel are not equal in terms of contact. I think dress is also important. The wheel loses some high spots on the first couple...
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