How would you control a slot’s placement with GD&T?

How would you control a slot’s placement with GD&T?

• A. Use a true position tolerance for the slot’s centerline, or apply parallelism/perpendicularity constraints to align with datums.
• B. Apply a circularity tolerance to the slot’s outline.
• C. Apply a true position tolerance to the slot ends only.
• D. Use a runout tolerance around the slot’s width.

Answer: (A)

Controlling a slot’s placement comes down to tying the elongated opening to the datum references through its axis. If you apply a true position tolerance to the slot’s centerline (its axis), you specify how far the entire slot can deviate from its intended location and orientation relative to the datums. This effectively constrains both where the slot sits and how it points, ensuring the slot is properly located and aligned with the datum features. You can also reinforce this by using parallelism or perpendicularity to the datums to fix the slot’s axis direction, keeping the slot oriented as required. Applying true position to just the ends wouldn’t guarantee the whole slot stays in the correct place or maintains proper orientation—the middle portion could drift. Circularity is about a round outline, which isn’t relevant to a slot’s location. Runout around the slot’s width controls surface relation during rotation, not fixed placement relative to datums. So, positioning the slot via the centerline true position (and/or axis-oriented constraints like parallelism/perpendicularity) is the correct approach.

Controlling a slot’s placement comes down to tying the elongated opening to the datum references through its axis. If you apply a true position tolerance to the slot’s centerline (its axis), you specify how far the entire slot can deviate from its intended location and orientation relative to the datums. This effectively constrains both where the slot sits and how it points, ensuring the slot is properly located and aligned with the datum features. You can also reinforce this by using parallelism or perpendicularity to the datums to fix the slot’s axis direction, keeping the slot oriented as required.

Applying true position to just the ends wouldn’t guarantee the whole slot stays in the correct place or maintains proper orientation—the middle portion could drift. Circularity is about a round outline, which isn’t relevant to a slot’s location. Runout around the slot’s width controls surface relation during rotation, not fixed placement relative to datums. So, positioning the slot via the centerline true position (and/or axis-oriented constraints like parallelism/perpendicularity) is the correct approach.