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True Position of Notched Slot

BAWinspector
I'm tryijng to create a program to measure 3 notched slots and report their true position. I have included pictures of the features from the print as I'm sure I wouldn't be able to explain it in words.Sunglasses
One of the slots is datum C and is TP'd to A (datum A is the top plane) and B while the other 2 slots are to A B and C. The intent of the engineer is to have a .002 TP only on the angle of the slot, the depth of the slot is controlled by .303 +/-.005.
Using the notched slot auto feature, I contruct the true position and use the angle in the advanced tab. Is there a way to have it not use the radius?
Any assistance would be greatly appreciated.
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  • There is no actual mention of a Line being used to define the true position of the slot to 'tie' it in to the datum.

    If there is, then construct a line from the slot centre for the other slots & ask for the angle between the lines.
  • I'm curious as to where Datum -B- is defined. I'm even more curious why the engineer employed a .002"TP when a tolerance applied to the angle would suffice for location.
  • Auto slot (square/rounded) should suffice when trying to dimension for True Position, just be sure to clean up your theo's....I use auto feature all the time for this and it works like a charm. The only issue you may have, depending on the year of your machine and type is whether to use Legacy mode or exact mode.....
  • Use the measured radius as nominal radius and the TP will be calculated using the angle only.
  • I think I would just report it to [-a-b-c-]. The feature would report zero but, it could be located anywhere around the ring. It is called out correctly. Another way to look at it might be a perp to [-b-] if [-b-] is the center cylinder.
  • I am looking at your feature control frame and in my opinion, it's not asking for TP, it's asking for a ±. (eg. pos. location ± .001 @ mmc to datums -A- & -B-, note, no modifiers) My reason is the lack of a Ø symbol in the tol. box. Normally, a notch / slot is longer for fit, no need for a diametrical zone. I have seen prints that TP slots and notches, but I note the powers that be and let them tell me how they want the report dimensioned.
    Adding, I just noticed, the FCF should be zeroed in one axis since it's noted as the -C-, henceforth the -A-B- datum scheme. The other view notes a FCF to -A-B-C- with -C- having a modifier along with the tol. The lower note states 2X for the other two notches are to be dimensioned. Just my thought, let me know if I am wrong.


    Odda
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