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  1. mhajicek

    Help milling slot with tight tolerance

    In my experience Helical and Harvey are usually spot on .001" smaller than nominal.
  2. mhajicek

    Have you ever met a machinist that was better than you?

    A couple points, which have been touched on a bit already. 1. There are different kinds of "good". One person may be really good at knocking out simple parts really fast, but then hit a wall or make mistakes when things get tricky. Another might be slow as molasses, but able to handle the...
  3. mhajicek

    "Win the Lottery" Home Garage Machine(s)?

    Do they sell special high-strength pull-studs?
  4. mhajicek

    Steel alloys for AR bolt heads ?

    In med device design we try to avoid having two parts of the same material and hardness move against each other, so my instinct would be to use two slightly different alloys. I think I'd make the bolt head slightly softer, since it's the easier part to replace. But we have to design for...
  5. mhajicek

    "Win the Lottery" Home Garage Machine(s)?

    Don't forget satellites. https://arstechnica.com/tech-policy/2024/03/spacex-building-hundreds-of-spy-satellites-for-us-government-report-says/ Seems these days if you want any privacy you need an underground facility.
  6. mhajicek

    "Win the Lottery" Home Garage Machine(s)?

    Well, if I had lottery money, big lottery money, I'd be tempted to get a sizable shop space, and buy half a dozen or more similar machines from different MTBs and do a Project Farm comparison. Then sell all but the best, and do it again with another category of machines.
  7. mhajicek

    Impossible to machine feature?

    Yes, it would be slow.
  8. mhajicek

    Impossible to machine feature?

    WEDM with a rotary could do it repeatably. What are the surface finish requirements?
  9. mhajicek

    Haas) Super Mini Mill #2) Skip warm up cycle?

    I do that one all the time. It's one reason I only have N#'s at the start of every tool. I forgot the spindle thing because I almost never run in manual mode.
  10. mhajicek

    Haas) Super Mini Mill #2) Skip warm up cycle?

    Yup, I forgot about this. You don't even need to turn the spindle on first, just MDI "S2000" or whatever speed you want, then it should work.
  11. mhajicek

    Skills test for hiring machinists

    That's basically how I got into Dunwoody. They said my grades from high school would normally disqualify me, but because of how high I scored on the entrance tests they'd make an exception.
  12. mhajicek

    machining 304 stainless steel

    TBF, that's all advice.
  13. mhajicek

    Haas) Super Mini Mill #2) Skip warm up cycle?

    Shouldn't have to run the warmup. Did you forget to hit the "POWER UP" button after the green power on button?
  14. mhajicek

    Maybe getting out of machining...

    My advice would be to get an affordable, yet capable, machine, and start making parts on the side. When your business card says "Owner", they don't care about your education; just what you can do.
  15. mhajicek

    Big Print Problems with PA12cf

    <Project Farm voice> "We're gonna test that!" Measure the height just when your spool runs out, then measure again after it's been sitting a few minutes.
  16. mhajicek

    Drip feeding to 2005 VF2 with 4th axis - how does the buffer work?

    Oh, and if you're running a USB to serial adapter, most of those have buffering that causes problems.
  17. mhajicek

    Drip feeding to 2005 VF2 with 4th axis - how does the buffer work?

    I seem to recall there was a trick about running your DNC software in "realtime mode" or something like that, to avoid timing hiccups caused by multithreading. Last I had to do serial was in Windows XP.
  18. mhajicek

    advice on how to machine a back side counterbore.

    I've done similar things with tools like this. Keep the length of cut small, to minimize deflection force, and step down about half to two-thirds of that.
  19. mhajicek

    What’s going on at Boeing

    Well, it's possible he did, after being told that if he didn't, unspeakable things would happen to his loved ones. Evil works in nefarious ways.
  20. mhajicek

    What’s going on at Boeing

    https://www.bbc.com/news/business-68534703
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