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  • Sunday morning quiz. What size hole is this?

    Discussion in 'The main mechanical design forum' started by Outofmydepth, Nov 14, 2010.

    1. Outofmydepth

      Outofmydepth Active Member

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      What size hole is this?

      I need to determine the size of a hole with means I have available.

      An 8.5mm drill bit fits in easily

      A 21/64ths drill bit fits in easily

      A 9mm drill bit does not fit.

      A 11/32nds seems as if it might be a perfect fit but I am afraid to push it in too hard in case I cannot easily remove it.

      The hole has to be either

      0.335"

      OR

      0.350"

      Which is it?

      Thanks

      Outofmydepth
       
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    3. GarethW

      GarethW Chief Clicker Staff Member

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      Re: Sunday morning quiz.

      OK, to summarise..

      21/64ths or 0.33" (8.3mm) = fits in easily
      8.5mm = fits in easily
      11/32nds or 0.34375" (8.73mm) = possible interference fit
      (0.35") 9mm = doesn't fit

      I think I've got those right - this is handy for converting units by the way :)

      Sounds like your hole is probably 8.5mm (0.335"). 8.9mm (0.350") sounds a little on the large size if you have an interference fit potentially starting at 8.7mm.
       
    4. Outofmydepth

      Outofmydepth Active Member

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      Thanks GarethW,

      After posting this question I had a look at it myself.

      Found a conversion factor cm to inches x 0.3937

      21/64 = 0.328125

      11/32 = 0.34375

      8.5mm = 0.334645

      9mm = 0.35433

      Given the alternatives .335 and .350

      If hole was .350 the 11/32 / 0.34375 would fit but it does not.

      Hole is therefore .335

      Outofmydepth
       

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