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  1. J

    Another Drawing Discrepancy thread....

    I'll argue that adding a note constitutes a functional change and should mandate a revision. Revisions are cheap in a well set up drafting system (and if not, there's a separate internal process issue). For my engineers I'll occasionally allow a spelling typo to be corrected, fix a line cross...
  2. J

    GD & T Question

    We don't have the entire drawing. I've often seen a note along the lines of "Untoleranced dimensions are basic." I use boxes per the standard, but does the drawing have a note like that somewhere?
  3. J

    10-32 vs 10-24 Just curious why 10-32 is more popular when NC is more common.

    A few places sell the taps and dies. Personally I’d single point it. I had to click the “I’m human” box a couple times, but this place lists one length of them: https://www.parts4heating.com/Reznor-RDF-90167-p/90167.htm
  4. J

    A humble request for mentor. Potential new shop.

    Does that 2 machine combo yield you a higher or lower throughput (2 spindles turning at once)? Does it leave you open to a broader array of work? Does it just mean you spend 2x as much time making fixtures instead of parts and have more touch points to potentially mess up, in which case you...
  5. J

    Boring to depth on an HLV-h (clone)

    I’d have to build a dead stop first, but how accurate it “not that accurate” in this context? For me hitting +/- 0.0006” or so would be close enough that’s what I’ve seen for the auto thread disengagement, though admittedly n<10. That’s a mile for some things, but my gut is telling me that it...
  6. J

    A humble request for mentor. Potential new shop.

    I’m not a shop owner, I’m not even a full time machinist, and the only business I’ve owned was tiny, so take this with a chunk of salt. I have worked at a couple very early stage startups, and watched some go better than others. It seems like the customers you are looking at fall into two...
  7. J

    Recommendations for "fool proof" tool to measure between round surfaces

    This is not the appropriate way to sell your second hand gear, please contribute and then post in the classifieds section if you want to sell something.
  8. J

    Recommendations for "fool proof" tool to measure between round surfaces

    Szumikmoon, Your tone aside, it’s not good forum etiquette to re-open several year old threads unless you have some new information to an uncommon topic. I also wouldn’t assume that everyone making parts is making 100k parts/year, or wants to spend $80k to replace something they are doing with...
  9. J

    easy to use cmm

    Yep, new Mitutoyo 00 blocks, with cert, temperature controlled space, and the Keyence rep doing the measurement. I wanted it to work, needed something that could do what they claimed and had the money if it worked. What’s your interest?
  10. J

    easy to use cmm

    It doesn’t matter, if your bore isn’t perfectly perpendicular you get a misread with an optical system like that. I’ve had most of not all of those devices in front of me for a demo. None of them were accurate measuring a gage block for the same reason.
  11. J

    easy to use cmm

    You won’t meet 0.0006” in a bore with any level of certainty on a Keyence. We have one, it’s great, it’s not that great other than maybe on very thin parts. Also, necrothread.
  12. J

    Another Drawing Discrepancy thread....

    I never said the OP should check every dimension on customer drawings, though I have worked with people who do that. I said to check the size of the incoming stock (envelope dimensions), which is simple and catches a surprising number of undeclared changes.
  13. J

    Another Drawing Discrepancy thread....

    I hope there’s already a risk surcharge on quotes to this customer.
  14. J

    Another Drawing Discrepancy thread....

    The drafter was working with me, but he had a separate management chain from me and had independent initials on the drawing just as much as Manufacturing and Quality. No, not hyperbole. I don’t think I can fix everyone’s mistakes. I do think there is a reasonable level of care that should be...
  15. J

    Another Drawing Discrepancy thread....

    The 10% logic comes from the fact that at the end of the day I don’t trust people outside of my control. It’s easy to say “this was zero percent my fault”, but that also implies there was nothing reasonable you could do to prevent it from happening again. I used to work with a drafter who...
  16. J

    Boring to depth on an HLV-h (clone)

    I have Sharp HLV-H clone. I understand how to thread to a stop, but want to bore to a stop using the carriage power feed. Currently I get it close on the power feed and then walk it in by hand on the DRO, which results in either telling me how much I overshot, or getting to the right place but...
  17. J

    Another Drawing Discrepancy thread....

    Changing a drawing without changing the REV is a massive no-no. A few years ago I sent a drawing with a giant “DO NOT PRODUCE, UNRELEASED” note on it. It was there because we were exchanging unreleased drawing for DFM. Get my part back and it’s an old REV. “You never sent us a new one, so we...
  18. J

    Moving. Move or Replace Mill?

    If you sell it you’re still going to need to get the new one home after you find it. Moving a mill across state lines isn’t a ton different than moving one across town. It still needs to be well secured for safe transportation. By the time you subtract the hassle of selling yours, vetting a...
  19. J

    Turning a tungsten anti tank round into a wedding band.

    First off, are we talking tungsten or tungsten carbide? Most wedding rings I’ve dealt with, are tungsten carbide. I’ve broken one by slapping my hand onto a piece of steel too hard, but they’re fairly scratch resistant. Doable to work your own, but you’ll want to do it with diamond. On the...
  20. J

    18" and 24" dial caliper brands

    Not that it’s a reason to get a new phone, but I did for the first time in about 4 years and discovered that the camera can now focus close enough that I can use it as a useful magnifier.

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