Statement: The performance of a component or a part
is determined by the material the part is made from. The performance
is also related to the dimensions, tolerances, and surfaces of
the part. During the design stage, dimensions, tolerances, and
surfaces are three attributes that are specified by the product
designer. The physical realization of these specifications has
a dominant influence on the production cost. Design for manufacturability
and design for assembly call for careful consideration on specifying
these three attributes.
Problem 1 Tolerances can be specified in three formats,
depending on their natures. They are unilateral format, bilateral
format, and limit format. For each of the tolerances listed below,
write the other two formats if these formats exist.
Problem 2 Use the tables provided on pages 52-67 to identify
1. the maximum and minimum dimensions of the hole and/or shaft;2. the tolerances for the hole and the shaft, respectively; and
3. the maximum clearance and the minimum clearance.
(1) basic diameter: 5 inches, Basic-Hole System, Clearance Fit = LC2.(2) basic diameter: 5 inches, Basic-Hole System, Interference Fit = LN3.
(3) basic diameter: 5 inches, Basic-Hole System, Transition Fit = LT3.
(4) Draw a comparison diagram which includes the above three cases.
Problem 3 Use the tables provided on pages 52-67 to identify
1. the maximum and minimum dimensions of the hole
and/or shaft;
2. the tolerances for the hole and the shaft, respectively; and
3. the maximum clearance and the minimum clearance.
(1) basic diameter: 5 inches, Basic-Shaft
System,
Clearance Fit = SLIDING.
(2) basic diameter: 5 inches, Basic-Shaft System, Interference Fit = FORCE.
(3) basic diameter: 5 inches, Basic-Shaft System, Transition Fit = LOCAT. TRANS.
(4) Draw a comparison diagram which includes the
above three cases.
Problem 4 The following figure is the measurement
of a surface profile. Calculate the roughness average value,
root mean square value, and peak-to-valley value (four sections
are assumed)