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True position of... length?

Erikir
I have a round slot, 17 mm from edge of radius to edge of radius and 4mm wide.

My drawing says
17 +/- 0.3
|TP|0.5 MMC |A|B|C| (length)
Boundary

4+/- 0.3
|TP|0.2 MMC |A|B|C| (width)
Boundary

How do I report that?
Parents
  • I run into slots using TP (Ø in the FCF tol. box) at times, and TP them as mentioned in the thread because I am told to. I do not think a slot should be TP, based on the different size of the width and length tol., not to mention the pos. tol. difference. Maybe someone can answer this, if you TP a slot in one axis, would not the TP formula figure out the location in a diametrical zone, possibly impeding into the other axis, making it possibly out of tol.? I was told by my GD&T instructor, slots should be basic dimensioned due to their function. As the Tec note shows, two separate positional call outs with no Ø symbol in the tol. box. My understanding of this means ±. Am I misunderstanding this? Or when a slot is TP, the person that made the print made an error? I always let the powers that be tell me what they want and report as such, but it would be nice to have a clear understanding.
Reply
  • I run into slots using TP (Ø in the FCF tol. box) at times, and TP them as mentioned in the thread because I am told to. I do not think a slot should be TP, based on the different size of the width and length tol., not to mention the pos. tol. difference. Maybe someone can answer this, if you TP a slot in one axis, would not the TP formula figure out the location in a diametrical zone, possibly impeding into the other axis, making it possibly out of tol.? I was told by my GD&T instructor, slots should be basic dimensioned due to their function. As the Tec note shows, two separate positional call outs with no Ø symbol in the tol. box. My understanding of this means ±. Am I misunderstanding this? Or when a slot is TP, the person that made the print made an error? I always let the powers that be tell me what they want and report as such, but it would be nice to have a clear understanding.
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