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  1. Cheaper 8.8 grade M6 screws that I have measure...

    Cheaper 8.8 grade M6 screws that I have measure between 5,82 to 5,93mm
    Better looking 12.9 grade socket head screws measure between 5,88 to 5,92mm
  2. Thread: File question

    by MattiJ
    Replies
    17
    Views
    372

    Is the file tang straight or bent to funny...

    Is the file tang straight or bent to funny shapes? If bent its certainly auto body file like this:
    Body File "PFERD" - Cut On One Side
  3. Much true for the smaller sizes but still doesn't...

    Much true for the smaller sizes but still doesn't explain why the 3/8" tap has larger shank than 1/2"

    I have DC Swiss N421 "thin shank" taps down to M4 and they work fine in that size, no idea if...
  4. FFS..and now NASA launch live streaming has some...

    FFS..and now NASA launch live streaming has some dude talking about police brutality and US riots.
  5. 1/2" tap shank passes the threaded hole...

    1/2" tap shank passes the threaded hole completely and that is handy sometimes. Still doesnt explain why the smaller MCTI taps like 3/8" are not dimensioned same way.
  6. Thread: File question

    by MattiJ
    Replies
    17
    Views
    372

    https://i.pinimg.com/originals/11/b9/3c/11b93cb8c8...

    https://i.pinimg.com/originals/11/b9/3c/11b93cb8c88c810423fc13f13590fa2d.jpg

    Anyone old enough to see auto shop working with lead filler and curved files?
  7. Thread: File question

    by MattiJ
    Replies
    17
    Views
    372

    Sounds like curved auto body files Lot of 4...

    Sounds like curved auto body files
    Lot of 4 Auto Body Bow Files,Nicholson Bodifile 50-210, Heller Nucut 5241 | #1815695547
  8. T- 30 s, fuel and lox loaded, "lets light this...

    T- 30 s, fuel and lox loaded, "lets light this candle"
  9. Replies
    14
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    633

    Korloy AK chip breaker and H01 grade is always...

    Korloy AK chip breaker and H01 grade is always my first attempt with anything gummy and nasty.
    You need to pay real attention also to HSS sharpening if you want to get it even as sharp as these...
  10. There is no pressing manufacturing reasons for a...

    There is no pressing manufacturing reasons for a bolt not to have near 100% theoretical major diameter. (unlike tapped holes that get lot more scary if you attempt to tap at 100% thread)
    (Exept...
  11. Replies
    23
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    1,209

    Maybe worth mention that ”honed” in above...

    Maybe worth mention that ”honed” in above context(carbide inserts) means rounded or dull edge. And if talking about HSS tools its more likely refers to the opposite, ie honed to razor sharp.
    ...
  12. Replies
    22
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    1,191

    I highly recommend the book. Its both informative...

    I highly recommend the book. Its both informative and entertaining in the same time and gives insight to the rocket developement from interesting standpoint.

    Book is also available free of charge...
  13. Replies
    22
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    1,191

    Quote from ”ignition” on some bat-crazy Fluorine...

    Quote from ”ignition” on some bat-crazy Fluorine based rocket propellant:
    ”It is, of course, extremely toxic, but that’s the least of the problem. It is hypergolic with every known fuel, and so...
  14. http://balax.com/sites/default/files/Tap-Blank-Dim...

    http://balax.com/sites/default/files/Tap-Blank-Dimensions.pdf
  15. Replies
    22
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    1,191

    Good running shoes are rocket engineers most...

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

    Nevermind: USCTI - United States Cutting Tool Institute (formerly MCTI).
  17. 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...
  18. 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
    .
    .
    .
  19. 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...
  20. 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...
  21. Replies
    40
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    2,306

    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...
  22. Replies
    105
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    4,143

    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...
  23. Replies
    33
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    1,629

    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.
  24. Replies
    105
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    4,143

    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
  25. Replies
    105
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    4,143

    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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