You're looking at a tutorial on
how to read an inch micrometer, and the image shows two examples. Let’s break down how to read both correctly.
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## 🔧 MICROMETER BASICS (INCH)
An inch micrometer measures in thousandths of an inch (0.001"). It has three main scales:
1.
Sleeve Scale (Main Scale) – Shows whole inches and tenths (0.1") and quarter-tenths (0.025").
2.
Thimble Scale – Rotates with the thimble; each division = 0.001".
3.
Vernier Scale (optional, not shown here) – For even finer measurement (not used in these examples).
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✔ EXAMPLE 1: LEFT IMAGE (PHOTO OF REAL MICROMETER)
This is the one that was calculated as
0.346 in — let’s verify it.
Step-by-Step Reading:
1.
Read the Sleeve (Main Scale):
- Look at the
horizontal line on the sleeve.
- You can see the
"3" mark is visible → that’s
0.300 in.
- Then look for the
0.025" marks below the horizontal line. There’s
one full 0.025" mark past the 0.300 line → add
0.025 in.
- So far:
0.300 + 0.025 = 0.325 in
2.
Read the Thimble Scale:
- The thimble scale lines up with the horizontal line on the sleeve.
- The line that aligns is
21 → so add
0.021 in (since each thimble division = 0.001").
3.
Total Measurement:
>
0.300 + 0.025 + 0.021 = 0.346 in ✔
✔️ The handwritten calculation is correct!
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✔ EXAMPLE 2: RIGHT IMAGE (DRAWN MICROMETER)
This one is drawn and labeled with calculations. Let’s check if they’re right.
Step-by-Step Reading:
1.
Sleeve Scale:
- The “2” mark is visible →
0.200 in
- Below the line, you see
three 0.025" marks →
3 × 0.025 = 0.075 in
- So far:
0.200 + 0.075 = 0.275 in
2.
Thimble Scale:
- The thimble line aligned with the sleeve’s horizontal line is
12 →
0.012 in
3.
Total Measurement:
>
0.200 + 0.075 + 0.012 = 0.287 in ✔
✔️ The handwritten answer
0.287 is correct!
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## 📌 SUMMARY
| Example | Sleeve (main) | Sleeve (0.025" marks) | Thimble | Total |
|---------|---------------|------------------------|---------|-------|
| Left (Photo) | 0.300 | +0.025 | +0.021 |
0.346 in |
| Right (Drawing) | 0.200 | +0.075 | +0.012 |
0.287 in |
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## 💡 TIP: How to Remember
>
“Big numbers on sleeve, small numbers on thimble.”
- Sleeve gives you the
tenths (0.1") and 0.025" increments.
- Thimble gives you the
thousandths (0.001").
- Add them all up!
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✔ So yes — both readings are correct! The image is teaching you how to properly interpret the scales of an inch micrometer. Great job following along!
Parent Tip: Review the logic above to help your child master the concept of micrometer reading worksheet.
