Calculated Gap Between Internal and External FOS with TOP
Calculated Gap Between Internal and External FOS with TOP
(OP)
Hi Guys,
I'm confuse with how calculated the gap between to mating FOS controlled with TOP, in we have a hole and a pin, what is the value of the gap or the interference between this 2 FOS?? Please see the attached file..
thanks
EveTrujillo
I'm confuse with how calculated the gap between to mating FOS controlled with TOP, in we have a hole and a pin, what is the value of the gap or the interference between this 2 FOS?? Please see the attached file..
thanks
EveTrujillo





RE: Calculated Gap Between Internal and External FOS with TOP
Minimum gap is when both hole and pin are in their virtual condition, since virtual condition is maximum material boundary that shall not be violated considering feature's MMC size and maximum allowed position tolerance.
Thus, Min Gap = (31.2-3.7)/2 = 13.75
Maximum gap would be when both hole and pin are at LMC, in addition, considered that axis of hole and pin are displaced in opposite direction by the amount of maximum allowed position error,as shown in below figure.
Thus, Max Gap = A-B = (31.9/2+0.35)- (3.4/2-0.15)= 14.75
There might be some other nice and simple calculation, which doesn't cross my mind now.
RE: Calculated Gap Between Internal and External FOS with TOP
RE: Calculated Gap Between Internal and External FOS with TOP
the image was a big support too.
so, the minimum gap = Int VC/2 - Ext VC/2
the max gap = Interal RCB/2 - RCB/2
so, if I add a datum shift, the maximum and the minimum gap is calculated different?