0005// Convert basic dimensions to equal toleranced dimensions

Example:

Question:

If the two holes opposite each other produced at a distance apart of 1.630 and holes measure a diameter 0.578, what is the maximum and minimum distance is allowed? and do 1.630 meet their positional tolerance?

Solution:

Step 1: Draw the true position diagram with maximum distance.

Calculation need consider:

=>when holes' size are MMC, holes located at true position with 0.02 tolerance

=>when holes' size are unrelated actual mating envelope, hole located to circumscribed of true positions

So, we get maximum distance is 1.628.

Step 2: Draw the true position diagram with minimum distance.

Calculation need consider:

=>when holes' size are MMC, holes located at true position with 0.02 tolerance

=>when holes' size are unrelated actual mating envelope, hole located to inscribed of true positions

So, we get minimum distance is 1.572.

Conclusion:

Basic dia 1.6 convert to 1.572-1.628 and 1.630 is out of specs.

Note:

Don't mix up with the definition of Basic Dimension (1.3.23). Convert basic dimension to toleranced dimension doesn't mean basic dimension come with tolerance.