When using a sketch to make a part, which statement is applicable?

When using a sketch to make a part, which statement is applicable?

• A. The sketch may be used only if supplemented with three-view orthographic projection drawings
• B. The sketch must show all information to manufacture the part
• C. The sketch need not show all necessary construction details
• D. The sketch is not used for manufacturing.

Answer: (B)

The essential idea is that a sketch used to manufacture a part must carry all information needed to produce it. This means including exact dimensions and tolerances for every feature, material, surface finish, and any special notes or instructions (such as thread type, hole specs, countersinks, or finishing requirements). If any information critical to fabrication is missing, the shop won’t be able to make the part consistently or correctly, leading to errors or rework. A sketch doesn’t have to be paired with three-view drawings in every case, but it must be sufficiently complete on its own to guide fabrication without ambiguity. The statement that the sketch must show all information to manufacture is the best reflection of how a sketch functions in production.

The essential idea is that a sketch used to manufacture a part must carry all information needed to produce it. This means including exact dimensions and tolerances for every feature, material, surface finish, and any special notes or instructions (such as thread type, hole specs, countersinks, or finishing requirements). If any information critical to fabrication is missing, the shop won’t be able to make the part consistently or correctly, leading to errors or rework. A sketch doesn’t have to be paired with three-view drawings in every case, but it must be sufficiently complete on its own to guide fabrication without ambiguity. The statement that the sketch must show all information to manufacture is the best reflection of how a sketch functions in production.