Question

15.-(8) Calculate the unknowns for the below case of a fixed fastener application. --Show- calculations. Hole dia 0.360+ Fastener dia 0.310 +0.002- Available hole position toler at-MMC-0.0219

Answer 1

GIVEN DATA :

Hole Diameter = $\phi$ 0.360 $\pm$ ? Inch.

Fastener Diameter = $\phi$ 0.310 $\pm$ 0.002 Inch.

Available Hole Position Tolerance at MMC = 0.021 Inch.

SOLUTION :

What is the Hole Tolerance ?

Available Hole Position Tolerance at MMC = 0.021. ( Given ).

Actually, the given Position Tolerance is Rectangular Tolerance Zone. That is, In X - Axis the overall Tolerance Height is 0.021 Inch. Similarly, In Y - Axis the overall Tolerance Height is 0.021 Inch. So, we can write, the Tolerance Height in both X - Axis & Y - Axis are $\pm$ 0.0105 Inch.

But, Fastener Tolerance = $\pm$ 0.002.

As per GD & T Theory,

Available Clearance = [ Available Hole Position Tolerance ] - [ Fastener Tolerance ] ----------------------------------------1.

As per Equation - 1,

Therefore, Available Clearance = [ 0.0105 ] - [ 0.002 ] = 0.0085 = 0.009 Inch.

Therefore, Available Clearance = 0.009 Inch.

Therefore, Hole Diameter = $\phi$ 0.360 $\pm$ 0.009 Inch.

ANSWER :

Hole Diameter = $\phi$ 0.360 $\pm$ 0.009 Inch.