INDUSTRIAL TECHNOLOGY-METALINDUSTRIAL TECHNOLOGY-METALASSOCIATED THEORY TOPICSASSOCIATED THEORY TOPICS

TOPIC 2.

MARKING & MEASURING

MARKING & MARKING & MEASURINMEASURING TOOLSG TOOLS

MARKING & MARKING & MEASURINMEASURING TOOLSG TOOLS

GAUGEGAUGESSGAUGEGAUGESS

MICROMETERMICROMETERS & VERNIER S & VERNIER CALIPERSCALIPERS

MICROMETERMICROMETERS & VERNIER S & VERNIER CALIPERSCALIPERS

Stainless Steel Rule

Measuring, marking distances & setting calipers.

Scriber

Marking lines on metal for cutting, folding etc.

Engineer’s Square

Marking lines 900

to an edge or checking 900 angles.Centre Punch

Mark a small indent toprevent drill bit runningoff centre.

Marking & Measuring ToolsMarking & Measuring Tools

Spring Dividers

Jenny or Odd-leg calipers

Scribing circles, arcs, or radii on Metal.

Marking lines parallel to an edgeor a rebate.

Marking ToolsMarking Tools

Inside Spring Calipers

Outside spring calipers

Measuring or checking inside diameters.

Measuring or checking outside diameters.

Marking ToolsMarking Tools

Blacksmith squareIt 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.

Marking & Measuring ToolsMarking & Measuring Tools

Clamping Clamping screwscrew

Square HeadSquare Head

ProtractorProtractorCentre Centre HeadHead

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.

The Combination SetThe Combination Set

Wire or Sheet Wire or Sheet gaugesgauges

Feeler gaugeFeeler gauge

These are useful for determining the exact size of sheet metal or small round stock such as wire or thin tubing.

This gauge can accurately test very small gaps between components. It is used commonly in the automotive trade.

The screw pitch screw pitch gaugegauge is used to check the size and type of threads on external surfaces.A depth gaugedepth gauge is useful for checking the depth of holes, rebates or shoulders. This model also has a vernier scale.

MICROMETERS & VERNIER CALIPERSMICROMETERS & VERNIER CALIPERS

This must be used when closing the spindle onto the object being measured to ensure consistent pressure, and hence an accurate reading.

RatchetRatchet

Testing AccuracyTesting AccuracyClose 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.

MICROMETERS & VERNIER CALIPERSMICROMETERS & VERNIER CALIPERS

Major Divisions=Major Divisions=

Minor Divisions=Minor Divisions=

Thimble divisions=Thimble divisions=

Total Reading=Total Reading=

4.00mm4.00mm

0.50mm0.50mm

0.17mm0.17mm

4.67mm4.67mm

Major Divisions=Major Divisions=

Minor Divisions=Minor Divisions=

Thimble Thimble divisions=divisions=

Total Reading=Total Reading=

11.00mm11.00mm

0.00 (none seen)0.00 (none seen)

0.07mm0.07mm

11.07mm11.07mm

MICROMETERS & VERNIER CALIPERSMICROMETERS & VERNIER CALIPERS

Sliding jawSliding jawFixed Fixed jawjaw

Main scaleMain scale

Vernier scaleVernier scale

Vernier zero =Vernier zero =

Vernier division =Vernier division =

Reading =Reading =

21.50mm21.50mm

0.24mm0.24mm

21.74mm21.74mm

(Press the space bar twice to see other types of vernier calipers)(Press the space bar twice to see other types of vernier calipers)

Vernier CalipersVernier Calipers

Both of these models have direct readout capability. Both of these models have direct readout capability. No calculations are necessary.No calculations are necessary.

Thumbwheel for Thumbwheel for adjustment.adjustment.

Digital readout.Digital readout.

Dial readoutDial readout