1. INDUSTRIAL TECHNOLOGY-METAL ASSOCIATED THEORY TOPICS
MARKING & MEASURING
GAUGES
MARKING & MEASURING TOOLS
MICROMETERS & VERNIER CALIPERS

2. Marking & Measuring Tools
Stainless Steel Rule
Measuring, marking distances & setting calipers.
Scriber
Marking lines on metal for cutting, folding etc.
Engineer’s Square
Mark a small indent to
prevent drill bit running
off centre.
Marking lines 900
to an edge or checking
900 angles.
Centre Punch

3. Marking Tools
Spring Dividers
Scribing circles, arcs, or radii on
Metal.
Jenny or Odd-leg calipers
Marking lines parallel to an edge
or a rebate.

4. Marking Tools
Inside Spring Calipers
Measuring or checking inside diameters.
Outside spring calipers
Measuring or checking outside diameters.

5. Marking & Measuring Tools
Blacksmith square
Clamping
screw
It is made in a single thickness.
This enables it to lie flat on sheet metal for ease of marking out.
The engineer’s bevel can be used to transfer angles from a protractor to the project.

6. The Combination Set
Square Head
Protractor
Centre Head
Marking and checking angles of 450 and 900. It also contains a small level.
Marking and checking any angle.
Finding the centre of round stock.

7. These are useful for determining the exact size of sheet metal or small round stock such as wire or thin tubing.
Wire or Sheet gauges
The screw pitch gauge is used to check the size and type of threads on external surfaces.
A depth gauge is useful for checking the depth of holes, rebates or shoulders. This model also has a vernier scale.
Feeler gauge
This gauge can accurately test very small gaps between components. It is used commonly in the automotive trade.

8. MICROMETERS & VERNIER CALIPERS
Ratchet
This must be used when closing the spindle onto the object being measured to ensure consistent pressure, and hence an accurate reading.
Testing Accuracy
Close the spindle against the anvil, (using the ratchet) and check the reading. A micrometer that has been “zeroed” will read zero when the spindle is completely closed.

9. MICROMETERS & VERNIER CALIPERS
Major Divisions=
Minor Divisions=
Thimble divisions=
Total Reading=
4.00mm
0.50mm
0.17mm
4.67mm
Major Divisions=
Minor Divisions=
Thimble divisions=
Total Reading=
11.00mm
0.00 (none seen)
0.07mm
11.07mm

10. MICROMETERS & VERNIER CALIPERS
Main scale
Vernier scale
Fixed jaw
Sliding jaw
Vernier zero =
Vernier division =
Reading =
21.50mm
0.24mm
21.74mm
(Press the space bar twice to see other types of vernier calipers)

11. Both of these models have direct readout capability.
Vernier Calipers
Dial readout
Thumbwheel for adjustment.
Digital readout.
Both of these models have direct readout capability.
No calculations are necessary.