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Type: Posts; User: MattiJ

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  1. Replies
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    898

    Oven/furnace like you showed in picture is...

    Oven/furnace like you showed in picture is probably not that well sealed and most probably wont hold 5lbs(PSI??) positive pressure inside. Maybe 5 Inch h2o would be possible positive pressure.
    ...
  2. Maybe less common for ”end user” products like...

    Maybe less common for ”end user” products like calipers but relatively common for lab standards.

    New gage block set is useless if it doesn’t come with calibration certificate with stated...
  3. This is a common problem with factory...

    This is a common problem with factory calibrations and non-accredited cal labs.

    Maybe easiest(but not cheapest) way is to ask for ISO17025 accredited calibration. It always comes with measurement...
  4. Replies
    9
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    948

    Sharp carbide inserts work really well. Average...

    Sharp carbide inserts work really well. Average steel specific insets are useless unless you get enough speed and doc. Aluminium specific ones are almost always enough sharp and work with tiny cuts...
  5. Replies
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    30,088

    I agree, bending angle for pull stud by...

    I agree, bending angle for pull stud by improperly seated toolholder is really tiny. If the toolholder retracts 1/2" from the spindle all hell is going to break loose even if the pull stud remains...
  6. Replies
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    Their website says that the pull studs are...

    Their website says that the pull studs are hardened to 52-56HRC. The upper end of the range definitely gets pretty sensitive about grain size, surface quality(rust, machining marks and scratches) and...
  7. Replies
    17
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    1,184

    Abrasive grit blasting with suitable grit and...

    Abrasive grit blasting with suitable grit and pressure might do the trick. Coarse grit blasted only for short time so that it raises some burs but removes minimal material?
  8. Replies
    490
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    30,088

    30-taper pull stud force is what? 2000lbs max?...

    30-taper pull stud force is what? 2000lbs max? And 7mm shank on the pull stud?
    BOG standard 12.9 grade bolt has 1200N/mm2 ultimate tensile strength -->> 46kN tensile --> 10300 lbs
    Safety factor...
  9. Replies
    41
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    2,486

    Why? Because with some products (not...

    Why?
    Because with some products (not necessarily inserts and not every market) there is 80% profit on the price and even smallest business customer gets 70% discount on list prices.
    Local...
  10. Replies
    490
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    30,088

    Grade 8 or metric 12.9 bolt would give useful...

    Grade 8 or metric 12.9 bolt would give useful "reference" for whack-a-mole :D test. But if the pull studs fail with brittle failure without elongation there is no need for further testing, too...
  11. Replies
    490
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    30,088

    Hammer whack test is better than it might sound...

    Hammer whack test is better than it might sound at first. If the part fails in brittle fracture with no plastic deformation it tells right away that the hardening has gone haywire or someone...
  12. Replies
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    1,080

    Mitutoyo 103-137 is about 60 AUD+GST if you are...

    Mitutoyo 103-137 is about 60 AUD+GST if you are bit lucky with campaigns (or dare to order from china!)
    OK, almost double price but so is quality. Your mic looks like cheapo quality even for chinese...
  13. Replies
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    Can you get better pictures for us armchair...

    Can you get better pictures for us armchair metallurgist? Location and the look of the fracture look intriguing. How do the fractured parts "butt up" with each other?

    Edit: If this pull stud ever...
  14. Replies
    41
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    2,486

    Yep. Lots of counterfeits, disappointing to see...

    Yep. Lots of counterfeits, disappointing to see that ebay is not doing much about it. Or manufacturers (foil hat people could say that lots of fakes are actually benefit for manufacturers that are...
  15. Replies
    47
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    2,560

    Only if you are planning blacksmith shop or heavy...

    Only if you are planning blacksmith shop or heavy forging.. :D
    Even heavy trucks are enough of problem in some locations like our office building that is apparently built on a clay bed.
  16. Replies
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    30,088

    I was thinking exactly the same. Grains look lot...

    I was thinking exactly the same. Grains look lot larger than what I'd like to see.
  17. Replies
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    "it depends" Wera and Taiwan? - The Garage...

    "it depends" Wera and Taiwan? - The Garage Journal Board

    I really don't mind even if they are taiwanese as long as they perform.
  18. Replies
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    1,457

    Wera is just another German brand. Wera Tools...

    Wera is just another German brand. Wera Tools
  19. Replies
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    2,486

    I went to further dig the selection the seller...

    I went to further dig the selection the seller has and look what I found
    10 new MITSUBISHI CCMT21.51 CCMT060204, Grade VP15TF Carbide Inserts | eBay

    Craptastic Mitsubishi inserts with box full...
  20. Replies
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    1,457

    "asian imports" (Taiwan) but decent quality. Lots...

    "asian imports" (Taiwan) but decent quality. Lots of the sockets today are pretty decent, probably even the better HF ones.
  21. Replies
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    610

    Quite typical for contactors to start buzz or...

    Quite typical for contactors to start buzz or chatter when they age.
    Dust, rust or some other crap between the core halves.

    They can also buzz if the coil voltage is lower than intended.
  22. Replies
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    Want free inserts for hobby shop? order brand...

    Want free inserts for hobby shop? order brand name inserts from chinabay and claim them as fakes. :D
    Serves right those chinese copycats.
  23. Replies
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    Yeah, I bought these out of curiosity after...

    Yeah, I bought these out of curiosity after Gordons positive remarks.
    Definitely better than bin bottom chinese calipers but still not Mitutoyo or Tesa in fit&finish.
    (like jaws are not...
  24. Replies
    32
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    1,173

    For sure not. Might trust them to 0.03mm if...

    For sure not. Might trust them to 0.03mm if measuring easy handheld workpiece like hardened and polished round pin in 2 to 40mm size.

    50% one way or another is expected quantization noise when the...
  25. Replies
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    My digital Shenchen(sp?) Pride calipers with...

    My digital Shenchen(sp?) Pride calipers with 0.0002" (0.005mm) resolution repeat remarkably well. Zeroing and testing blindly on a 8mm carbide shank I get maybe 1 result out of 100 that is off by...
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