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  1. http://balax.com/sites/default/files/Tap-Blank-Dim...

    http://balax.com/sites/default/files/Tap-Blank-Dimensions.pdf
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    Good running shoes are rocket engineers most...

    Good running shoes are rocket engineers most important gear or what was it? :D
  3. Nevermind: USCTI - United States Cutting Tool...

    Nevermind: USCTI - United States Cutting Tool Institute (formerly MCTI).
  4. I know it's from M.C.T.I. standard but have no...

    I know it's from M.C.T.I. standard but have no idea what that standard actually is. Sounds like ACME from Road Runner cartoons :D

    Square shanks even on most Metric taps from European manufacturers...
  5. Diameter minus pitch works like a magic for a...

    Diameter minus pitch works like a magic for a metric 77% thread. Or I guess it works also for murican UN thread but the numbers get wonky.
    65/16"-1/18" = F
    7/16"-1/14" = U
    .
    .
    .
  6. Guhring gives 4,70mm hole size for 100% M6...

    Guhring gives 4,70mm hole size for 100% M6 thread.

    Note that 1/4 of the imaginary thread triangle tops are missing from the "ideal standard thread" in your drawing. 100% thread doesn't have sharp...
  7. You can't compete with "thermite" in terms of...

    You can't compete with "thermite" in terms of typing speed or post count :D
    He has 30 000 posts and they are pretty often kinda long-winded riddles. And that is only one of his 3 screen names he has...
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    Brick Experiment Channel on youtube is probably...

    Brick Experiment Channel on youtube is probably worth mentioning for lego-gearheads:
    YouTube

    googol to one gear reduction ratio:
    YouTube

    lifting 200 kg with lego blocks, lego motors and lego...
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    Story I have heard is that Germans jumped on the...

    Story I have heard is that Germans jumped on the tungsten carbide tooling lot faster as they saw it as a more efficient way to use the limited tungsten supply.
    And Americans went to molybdenium-HSS...
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    Props for the update with the results! Too...

    Props for the update with the results!
    Too often these threads fade to history without update from the original poster if he managed to solve the problem and what was the solution.
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    I have only home shop but.. ...

    I have only home shop but..

    https://lukujonossa.fi/wp-content/uploads/2014/10/Aint-nobody-got-time-for-that.jpg
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    Cheap chinesium parting inserts are perfect stock...

    Cheap chinesium parting inserts are perfect stock for making your own grooving tools. 10pc box of mgmn200 inserts is about 6 usd. At 30 cents per cutting edge you don’t need to attempt at too much...
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    HSS is brittle. Not exactly breaking news.(pun...

    HSS is brittle. Not exactly breaking news.(pun intented)
    Soft or un-twisting HSS drills are obviously faulty but this one has behaved pretty much expected. OK, possibly failed at lot lower stress...
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    thickness gauge sort of? Quick-Mini Series 700...

    thickness gauge sort of?

    Quick-Mini Series 700
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    0.012" ? Ha, that qualifies as a bar stock :D ...

    0.012" ?
    Ha, that qualifies as a bar stock :D

    This was about 14 micrometers or 0.00055 inches in diameter:
    https://i.imgur.com/uHDSiUN.jpg

    Any smaller than that and you need damn electron...
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    1,595

    Pull out your wallet and start asking around from...

    Pull out your wallet and start asking around from EDM services.
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    516

    Grobet USA Swiss Pattern Precision 6” Half-Round...

    Grobet USA Swiss Pattern Precision 6” Half-Round File, Cut 6
    https://www.amazon.com/Grobet-32-510J-File-Set-stanleysupply/dp/B0184Y5KI0

    edit: Italy is another manufacturing site for Grobet USA
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    some of the "Grobet USA" products are actually...

    some of the "Grobet USA" products are actually made in China. Grobet USA is just trickster name to milk 'Muricans.
  19. Another vote for moisture.

    Another vote for moisture.
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    C37 as Rockwell hardness C37? That would be...

    C37 as Rockwell hardness C37? That would be something like grade 8 bolt.

    100% agree with others, what OP is having is usually called tearing.
    Two ways around it: LOT more speed, heavier infeed or...
  21. And there is some other weirdos also in cars....

    And there is some other weirdos also in cars. Like seatbelt mounting bolts that are inch sized even in all the German cars. (Bolt size actually matches some weird metric size too..)
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    There has to be more than a few tooling suppliers...

    There has to be more than a few tooling suppliers in Edmonton.
    SOWA 123-308 Yellow Ring HSSE-V3 Spiral Point Tap - 1/4 inch at Edmonton Fasteners and Tools Ltd.
    Thomas Skinner Company Profile
  23. Given how close they are in carbon content I'm...

    Given how close they are in carbon content I'm quite surprised that you were able to sort them out on spark test.
    Or is it the chromium that makes difference?
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    55 Rc sounds unrealistic for 316 so I'd vote for...

    55 Rc sounds unrealistic for 316 so I'd vote for "you got something else" . 420 maybe?

    Even still I'd follow the previous advice and toss the "regular hand taps" and get proper taps specially for...
  25. Maybe better yet: Make functional part but with...

    Maybe better yet: Make functional part but with some really cumbersome features and machine it in the worst possible order. :D
    Everything rounded, radiused and machined from angles that are only...
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