Chapter 20, Problem 26P

Answer the following questions regarding material condition modifiers.

(a)    What are the three material condition modifiers?

(b)    Which one is the default if nothing is specified?

(c)    Which one(s) can provide “bonus” tolerance?

(d)    Which of the following is increased by a bonus tolerance? (Select one.)

1.                     i.            A size dimension.
2.                  ii.            A ± tolerance of a size dimension.
3.                iii.            A basic dimension locating a feature.
4.                 iv.            A size of a tolerance zone controlling a feature.

(e)    To which of the following can a material condition modifier symbol be applied? (Select one.)

1. i.                    A size dimension.
2. ii.                  A ± tolerance of a size dimension.
3. iii.                A tolerance of a geometric characteristic controlling a feature of size.
4. iv.                A tolerance of a geometric characteristic controlling any feature.

(f)    Which material condition modifier should be considered if the goal is to ensure a minimum clearance fit for a bolt in a hole, but to give greater manufacturing flexibility if the hole is produced with a greater clearance?

(g)    Which material condition modifier should be considered if the goal is to provide a consistent press fit between interchangeable parts?

(h)    Which material condition modifier should be considered if the goal is to ensure a minimum wall thickness for a casting, but to give greater manufacturing flexibility if the wall is produced with a greater thickness?