Which of the following statements is correct...

🔍 Key Concepts

• Carefully examine what the 0.64 dimension is measuring on both ends of the shaft drawing and whether it relates to diameter change or a surface feature like flats. • Think about what makes a shaft symmetrical in a mechanical drawing and how the center hole or drilled passage affects longitudinal dimensions. • Consider how undercuts are treated in length/tolerance calculations: are they normally included in functional length dimensions, or are they reliefs that don’t change the specified working length?

💭 Think About

• Look at the 0.64 dimensions on each end: are they shown on a side view where the diameter changes, or on a view where a flat surface is milled? What does that suggest about whether they are flats or steps? • If the part is symmetrical about the central drilled hole, what does that do to the distance from each end of the shaft to the centerline of the hole? How would you compute the possible range of a threaded length from the given overall length and tolerances? • Do the .03 undercuts appear as separate, small relief areas at the shoulders? When you read the dimension chain from one end of the shaft to the other, are those undercuts included as part of the critical length, or are they simply clearance features?

✅ Before You Answer

• Verify exactly where the 0.64 dimension arrows touch the part and what surfaces they span. • Trace the dimension chain from one threaded end to the center and then to the other threaded end, noting which dimensions have tolerances and which don’t. • Confirm whether the .03 undercut is given a length dimension that participates in the main chain of functional lengths, or if it is just a local feature that does not change the specified overall and shoulder-to-shoulder lengths.

Which of the following statements is correct regarding the device shown in the illustration? Illustration GS-0008

The areas dimensioned 0.64 in length are flats on the shaft.

The areas dimensioned 0.64 in length are steps in the shaft diameter.

If the piece is symmetrical about the 3/16 hole, the threaded ends have longitudinal tolerance dimensions of 0.789 inch to 0.825 inch.

All the 0.03 under cuts must be taken into account when adjusting lengths to meet the specified tolerances.

🔍 Key Concepts

💭 Think About

✅ Before You Answer