Dimensions and Tolerance

Question 1

What is a bilateral tolerance?

Answer 1

A tolerance where the part’s dimensions can be greater or less than the ideal value.

e. g. 2.5mm + 0.1
- 0.1

Question 2

What is a unilateral tolerance?

Answer 2

Same as bilateral, only we let it change in one dimension. Same format as bilateral, but one of the values are zero.

Question 3

What is a limit dimension?

Answer 3

When you specify just the min and max allowable value, and the machinist can do whatever he wants.

Question 4

What is CMM?

Answer 4

CMM is a coordinate measuring machine. There’s a touch trigger probe that moves around and feels for the object.

Question 5

What is surface roughness?

Answer 5

Surface roughness is an average of the vertical deviations from the nominal surface.

Question 6

What is cutoff length?

Answer 6

It’s a sampling technique for minimizing waviness accidentally being measured as roughness. A length is chosen so that the sampling frequency is the same as the waviness frequency, cancelling it out.

Question 7

What is Kaizen?

Answer 7

Continuous improvement in quality.