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Question

Difficulty: MediumMeasuring and Layout Tools

A machinist needs to locate and scribe the exact center lines on the circular end face of a solid round steel bar before turning it on a lathe. Which component of a combination square set is specifically designed for this layout operation?

  1. A
    Protractor head
  2. Center headAnswer
  3. C
    Square head
  4. D
    Depth gauge attachment

Answer

Center head
A center head mounts onto the steel rule of a combination square with a precision 90-degree V-slot. When placed flush against the outer perimeter of a cylindrical bar or shaft, the edge of the blade automatically bisects the circle along its diameter. Scribing two distinct diameter lines creates an intersecting crosshair at the exact center of the workpiece.

Step-by-Step Solution

1
Identify the geometry of the workpiece and the required layout task.
The workpiece has a circular cross-section, and the task requires locating its geometric center point.
Matching the workpiece shape and layout requirement prevents the selection of tools suited only for flat or angular layout.
2
Determine which attachment of a standard combination set aligns with cylindrical workpieces.
The center head features a 90-degree V-notch that seats against the outer curvature of round stock, positioning the blade along the diameter.
Scribing two diameter lines at different angles produces an intersection at the true center of the cylinder.

Key Concept

Combination Square Attachments and Radial Layout
Estimated Time:1m 0s
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Topics

Measuring and Layout Tools

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