Correct the whole reading

A single-start micrometer advances 0.50 mm per turn and has 50 circular divisions. For a spacer, the exposed sleeve reading is 1.50 mm and division 28 meets the datum. Clean closed faces indicate +0.03 mm.

What is the corrected spacer thickness?

Organize the givens & assumptions

p = 0.50 mm/turn; N = 50
s = 1.50 mm; n = 28
Signed zero indication z = +0.03 mm

Uniform pitch, no backlash or deformation, square contact, and a stable additive zero offset.

Choose one answerA

1.75\ \mathrm{mm}

1.78\ \mathrm{mm}

1.81\ \mathrm{mm}

1.25\ \mathrm{mm}

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Problem: Correct the whole reading
A single-start micrometer advances 0.50 mm per turn and has 50 circular divisions. For a spacer, the exposed sleeve reading is 1.50 mm and division 28 meets the datum. Clean closed faces indicate +0.03 mm.
Question: What is the corrected spacer thickness?
Givens:
- p = 0.50 mm/turn; N = 50
- s = 1.50 mm; n = 28
- Signed zero indication z = +0.03 mm
Assumptions: Uniform pitch, no backlash or deformation, square contact, and a stable additive zero offset.
Choices (LaTeX):
A. 1.75\ \mathrm{mm}
B. 1.78\ \mathrm{mm}
C. 1.81\ \mathrm{mm}
D. 1.25\ \mathrm{mm}

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Correct the whole reading

Work through it with me.

The zero correction applies to the combined reading; it does not change the pitch or least count.

Find the fine scale

Combine the scales

Remove the known offset

With the same raw specimen reading, the calibrated offset were −0.03 mm instead. What would the corrected thickness be?

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