Which of the following measures might be included as part of machining tolerances on blueprints?

In machining, tolerances refer to the allowable limits of variation in a manufactured part's dimensions. Dimensional accuracy is a critical aspect of machining tolerances because it defines how closely the final dimensions of a part must match the specifications outlined in the blueprint. This ensures that parts fit together correctly and function as intended within an assembly.

Including specific measurements of dimensional accuracy on blueprints helps machinists understand the precision required for each component. It guides them in selecting the appropriate tools, setting up their machines, and adjusting their processes to achieve the desired specifications.

Other choices, while relevant to the overall manufacturing process, do not specifically pertain to the measurement of machining tolerances. Job time estimates focus more on production efficiency, heat treatment specifications relate to the material properties after processing, and color coding is typically used for organizational purposes rather than measuring dimensional accuracy. Therefore, dimensional accuracy is the most appropriate measure associated with machining tolerances on blueprints.