1. How to Calculate Gauge Tolerance ( Plug and Snap )

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Calculation of  Gauge  Tolerance 

( Plug  and  Snap )

    Simply  the  best  way  to  calculate  gauge  tolerance  by  using  IS : 3455 – 1971 Chart.

      1.   Plug gauges - in some cases called pin gauges. It is used for checking the diameter of a hole.

 Plug  Gauge  Tolerance  Calculation:-           

                                 GO = (K+Z) ± H/2

                           NOGO = G ± H/2

            Where    ‘K’   is minimum size,

                           ‘G’   is maximum size,

                           ‘Z’ , ‘H/2’  Value  is taken from Chart through difference between   

Maximum  and  Minimum size.  It is called ‘T’ in µm.(nothing but Hole Tolerance)

For Example,

            P/G Ø 20.0 ± 0.02   (19.98 / 20.02)

            K = 19.98,

            G = 20.02,

            T  =  20.02 -  19.98 = 0.04 (40 µm),      you  know    (0.001mm  =  1 µm)

Go to chart  

            Z = 0.005,

       H/2 = 0.002,

      GO = (K+Z) ± H/2

GO = (19.98+0.005) ± 0.002,

GO = 19.985 ± 0.002.

     NOGO = G ± H/2

       NOGO = 20.02 ± 0.002


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   2. Snap Gauge - is a form of go/no go gauge. It is used for checking the outside dimension of a part. 

  Snap  Gauge  Tolerance  Calculation :-  

                       GO = ( G - Z1 ) ± H1/2

                     NOGO = (K+ ∞ 1 ) ± H1/2

For Example,

            S/G   20.0 ± 0.02   (19.98 / 20.02)

            K = 19.98,

            G = 20.02,

            T  =  20.02 -  19.98 = 0.04 (40 µm),      you  know    (0.001mm  =  1 µm)

Go to chart  

            Z1 = 0.005,

       H1/2 = 0.003,

      GO = ( G - Z1 ) ± H1/2 

GO =  (20.02 – 0.005) ± 0.003,

GO  = 20.015 ± 0.003.

 NOGO = (K+ ∞ 1 ) ± H1/2

            NOGO =  19.98 ± 0.003.

 

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