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TolAnalyst RSS calculation with floating pin

Question asked by 1-Q9E37C on Mar 24, 2010
Latest reply on Aug 25, 2011 by NIRAV SONI

I tried using TolAnalyst to calculate RSS stackup involving a pin and hole, where the nominal diameter of the pin is smaller than the nominal diameter of the hole.

 

It seems TolAnalyst lumps the diameter tolerance for the pin, diameter tolerance for the hole and the play betweeen the pin & hole into one single value which it then squares during the RSS calculation (with the 'float fasteners & pin' option checked).

 

My understanding is that the tolerance for the pin and the tolerance for the hole should be squared separately, then added together before doing a square root.  Also, the 'play' value, which is the difference between the nominal diameters, should not be included in the square and square root process.

 

The TolAnalyst way of RSS calculation results in a bigger RSS value compared to manual calculations.  Is there a fix for this issue?

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