If the FRTZF could translate relative to each other even with SIM REQT applied, then what does SIM REQT do? The patterns should be constrained to the same datum reference frame, even if that reference frame is allowed to rotate or translate. Figures 4-40 and 4-41 in 2009 describing SEP REQT...
If we give the tolerances MMB modifiers and used a functional gage to inspect the SIM REQT FRTZF, wouldn't the notches simulating the virtual conditions of the slots be fixed in orientation to each other? So if any two slots were clocked to opposite sides of the PLTZF, the part would pass PLTZF...
Datum axis B would be perpendicular to datum plane A, and the FRTZF would already be perpendicular to A, so their parallelism to B is already controlled, right?
Thinking in terms of physical gages, I believe using SIM REQT on the FRTZF segments would satisfy design intent. Using one gauge to check the FRTZF would mean the patterns would have to be clocked to datum C together. If they weren't they'd pass the PLTZF check, but not the FRTZF check.
The 4 slot pattern features can be located .010 from each other, but the 6 slot pattern features can only be located .005 from each other. The four slot pattern cannot be clocked more than .0075 from the 6 slot pattern. Clocking to datum -C- is not critical.
I've attached a view showing the...
So would I be correct in saying that the max clocking offset between a slot in one pattern and a slot in the other pattern would be the sum of the FRTZF tolerances divided by two (so .0075)? Vs. the sum of the PLTZF tolerances divided by 2 (.015) if SEP REQT were specified?
I've got a cylindrical part with two patterns of notches around both ends. I'd like to position both of them as one pattern, but have the two patterns controlled by separate feature-related tolerances. If I tolerance them as shown in the attached drawing, will the PLTZF for both patterns be set...
But wouldn't using the LMC also give bonus tolerance to the feature? For example, a cooling hole pattern where you want to maintain the wall thickness between the holes. LMC on a position tolerance allows the position to vary more greatly when the holes are made smaller, so more parts would be...
I work for an aerospace company that seems to add the MMC modifier to almost every tolerance and datum reference possible, but I never see the LMC modifier used. Is there a reason the LMC modifier is used less often? Is it related to the inspection requirements for the part?
I understand that...
