Advanced Position Tolerance: Using Two Segments
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- čas přidán 10. 09. 2024
- This video shows an advanced technique for position tolerance to refine the location within a pattern of features.
This is a sample video from our GeoTol Pro 2020 online course per ASME Y14.5-2018
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#composite tolerance #datum #datum feature #position tolerance #asme #asme Y14.5 #Y14.5
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The explanation was very satisfactory
Shouldn't the position tolerance at 4:04, be a composite tolerance?
No, you don't want composite position there. The lower segment of composite is only rotationally constrained to the datum references. This would allow the holes to "float off" the datum axis. You need that hole pattern centered so it needs to be regular position to A-B.
@@GeoTolPro, thanks for the explanation.
When you assign datum A and datum B in the feature control frame and relative to A-B. A-B does not exist yet can you do that?
@@asaholey yes, it's called a compound datum. it's a datum formed by A and B simultaneously.
@@marcolima89 can I do that to to a counterbore hole? 2 difference dimension hole same axis?
Datums A & B can not reference themselves. This is incorrect.
This is correct and they are not exactly referencing themselves. Datum features A and B are both located to the average axis, A-B. This effectively locates them to each other and is the ideal way to qualify the datum features. Look at page 102, figure 7-17 in ASME Y14.5-2018.
@@GeoTolPro But, A and B diameters are the defining positions that define the axis A-B, therefore that 0.05 dia position tol is nonsense. Can you explain more please.