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Author: Crystal Bemis

Flatness or Parallelism

by Crystal Bemis on September 8, 2025.

In this Question Line video, Jason reviews a submitted drawing, explaining the difference between flatness and parallelism, and gives options on how to tolerance the drawing based on what is critical to the design.

Designing for Coaxial Holes

by Crystal Bemis on July 28, 2025.

In this Question Line video, Jason reviews a submitted weldment drawing and demonstrates how to calculate the position tolerance needed for a zero-clearance fit in the worst-case assembly scenario, ensuring that the shaft can pass through two coaxial holes.

Quick Sanity Checks on Extrusions

by Crystal Bemis on July 21, 2025.

In this Question Line video, Jason shares some quick sanity checks that can help identify manufacturing issues for an extruded part being controlled by profile of a line tolerances.

Irregular Features as Datum Features

by Crystal Bemis on July 7, 2025.

In this Question Line video, Jason explains how an irregular feature like a hexagon can serve as a primary datum feature and discusses how this part could be inspected – touching on gage design for manual inspection and point cloud analysis using a CMM.

Dimensions Identified for Inspection

by Crystal Bemis on June 30, 2025.

What does it mean when a dimension is circled on a drawing—and how does it impact manufacturing? In this video, Jason explains the informal use of ovals as quality control symbols and what it means for how parts are made and inspected.

GD&T Tolerance Analysis – Profile

by Crystal Bemis on June 16, 2025.

In this Question Line Video, Jason walks through a submitted drawing and clarifies how the feature control frames define the location and orientation of the tolerance zones for the profile of a surface control.

Choosing the Right GD&T Tolerances

by Crystal Bemis on June 9, 2025.

In this Question Line video, Jason reviews a submitted drawing that attempts to locate two parts relative to each other and explains how to choose the correct GD&T tolerances to support the intended function.

Separate Requirements at MMB

by Crystal Bemis on June 2, 2025.

In this video, Jason explains when simultaneous requirements apply and how the “separate requirements” note affects inspection, sharing examples that illustrate reasons for using each approach.

Significant Figures and Their Effects on Inspection

by Crystal Bemis on March 17, 2025.

In this Question Line video, Jason discusses the role of significant figures in identifying tolerances for dimensions with unspecified tolerances. He also walks through an example of how to determine the required accuracy of the measurement equipment according to the ASME Y14.43 standard.

Feature of Size Flatness

by Crystal Bemis on March 10, 2025.

In this Question Line video, Jason compares flatness directly applied to a surface associated with a feature of size against flatness applied to a feature of size.