Measurement Worksheet
Student Name: ___________________________________ Date: ___________________________________ Project / Assignment: ___________________________________
How to Use This Worksheet
- Measure each feature three times and record all three values
- Calculate the average: add the three values and divide by 3
- Round to one decimal place (e.g., 23.4 mm)
- Use the average in your OpenSCAD code - not a single measurement
Units: All measurements in millimeters (mm) unless otherwise noted.
Object 1
Object description: ___________________________________
| Feature | What You’re Measuring | M1 (mm) | M2 (mm) | M3 (mm) | Average (mm) |
|---|---|---|---|---|---|
| Length (X) | |||||
| Width (Y) | |||||
| Height (Z) | |||||
| Feature 4 | |||||
| Feature 5 |
Notes / sketches:
(describe the object here - label which direction is X, Y, Z)
Object 2
Object description: ___________________________________
| Feature | What You’re Measuring | M1 (mm) | M2 (mm) | M3 (mm) | Average (mm) |
|---|---|---|---|---|---|
| Length (X) | |||||
| Width (Y) | |||||
| Height (Z) | |||||
| Feature 4 | |||||
| Feature 5 |
Notes / sketches:
(describe the object here)
Object 3
Object description: ___________________________________
| Feature | What You’re Measuring | M1 (mm) | M2 (mm) | M3 (mm) | Average (mm) |
|---|---|---|---|---|---|
| Length (X) | |||||
| Width (Y) | |||||
| Height (Z) | |||||
| Feature 4 | |||||
| Feature 5 |
Notes / sketches:
(describe the object here)
Object 4
Object description: ___________________________________
| Feature | What You’re Measuring | M1 (mm) | M2 (mm) | M3 (mm) | Average (mm) |
|---|---|---|---|---|---|
| Length (X) | |||||
| Width (Y) | |||||
| Height (Z) | |||||
| Feature 4 | |||||
| Feature 5 |
Notes / sketches:
(describe the object here)
Object 5
Object description: ___________________________________
| Feature | What You’re Measuring | M1 (mm) | M2 (mm) | M3 (mm) | Average (mm) |
|---|---|---|---|---|---|
| Length (X) | |||||
| Width (Y) | |||||
| Height (Z) | |||||
| Feature 4 | |||||
| Feature 5 |
Notes / sketches:
(describe the object here)
Accuracy Check
After completing all measurements, compare your averages with a partner who measured the same objects.
| Object | My Average (mm) | Partner’s Average (mm) | Difference (mm) | Within 1 mm? |
|---|---|---|---|---|
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 | ||||
| 5 |
If any difference is greater than 1 mm, remeasure together and find the source of the discrepancy.
Percent Error (Optional / Extension)
If your instructor provides the “true” dimension of an object (measured with a reference instrument), you can calculate your percent error:
Formula: % error = (|your average true value| / true value) x 100
| Object | Your Average | True Value | Difference | % Error |
|---|---|---|---|---|
A percent error under 2% is excellent for caliper work at this level.
Reflection
Answer in complete sentences.
-
Which measurement was most difficult to take and why?
-
Did your three measurements for any feature vary significantly? What might cause variation between repeated measurements?
-
If you were designing an object in OpenSCAD that needed to fit over one of these objects, which measurement would you use - your smallest, your largest, or your average? Why?