03 Marking Tools

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Lesson No.03

Week No.03

Name of lesson

Marking Tools


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TRY SQUARE

Stock

Blade

90

Use:- to check the squareness ofmachined surface, flatness of

surface, make lines at 90 to the edge

of work pieces & to set work piece at

right angle on work holding device.

Material:- hardened steel.

Size:- available in 100mm, 150mm

& 200mm.

Types:- 1. Fixed try square

2. Adjustable try square


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CALIPER:- Calipers are simple measuring entinstrumused to transfer measurement from steel rule to objects

and vice versa. They are made from tools steel or high

carbon steel.

CALIPER

1. Firm joint caliper:- In the cage of firm joint

caliper, both legs are pivoted at one end.

To take measurement of a work piece, thecaliper is opened roughly to the required

size. Fine setting is done by tapping the

caliper lightly on a wooden surface.

Outside Caliper


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3. Inside Caliper:- This caliper is used to measure the insidedimensions like the width of slots, diameter of holes, etc.

Legs of this caliper are bent in outward direction as shown

in figure beside.

Inside Caliper


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4. Odd leg Caliper:- This caliper is also known as Jenny

caliper or Hermaphrodite caliper or leg and pointcaliper.They are used for marking lines parallel to inside

and outside edges, locating the centre of round bars,

drawing parallel lines along outer edges, scribing lines

along curved edges.


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DIVIDER

Use:- for scribing circles, arcs and

transferring and stepping ofdistances.

Material:- tool steel or high

carbon steel.

Size:- 50mm to 200mm.


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PUNCH

Use:- Punches are used in order to make certain

dimensional feature of the layout permanent.

Material:- They are made of high carbon steel.

Types:- 1. Centre punch(90)

2. Dot punch(60)

3. Prick punch(30)


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1. Centre Punch:- The angle of

the point is 90. The punchmark made by this is wide and

not very deep. This punch is

used for locating hole. The

wide punch mark gives a good

seating for starting the drill.

2. Dot Punch:- The angle of thepoint is 60. This punch is used

for marking witness marks.

Dot Punch

Centre Punch


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3. Prick Punch:- The angle of the

point is 30. The 30 point

punch is used for making light

punch marks needed to positiondividers. The divider leg will

get a proper seating in the

punch mark.

Prick Punch


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SCRIBER

Use:- scribe lines to indicate the dimensions of the work

piece to be filed or machined.

Material:- They are made of high carbon steel.

Types:- 1. Single ended 2. Double ended

3. Knife edge 4. Off-set.

1. Single ended:- This scriber is also

known as Hand scriber. Point ismade on one side only. Knurling is

made on the body of this scriber. It

is used for general marking

purposes.


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Grip

BentPoint

Straight

Point2. Double ended:- This scriber has

one point each at both ends. One of

which is bent at 90, another point

is kept straight. Centre portion ofbody is knurled for better gripping.

This scriber is used mainly in

accordance with scribing block.


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SCRIBING BLOCK

Use:- It is used for ; -

- Scribing lines parallel to a datum surface. -

- Setting job on machines parallel to a datum surface. -

Checking the height and parallelism of jobs, setting

jobs concentric to the machine spindle

Types:-

1. Fixed scribing block

2. Universal scribing block.


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1. Fixed Scribing Block:- The

fixed type of surface gauges

consists of a heavy flat baseand a spindle, fixed upright,

to which a scriber attached

with a snug and a clamp nut.

Fixed Scribing Block

Scriber

Nut

Spindle

Snug

Base


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2. Universal Scribing Block:- This

surface gauge has the following

additional features;

- The spindle can be set to any

position.- Fine adjustments can be made

quickly.

- Can also be used on cylindrical

surfaces.- Parallel lines can be scribed from

any datum edge with the help of

guide pins.

Universal Scribing Block

Scriber

Snug

Nut

Spindle

Rocker

arm

Base

Guide

Pin

Fine

adj.

screw


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Use:- To support the job and to provide a vertical or

angular plane for marking.

Material:- Angle plates are made from Cast iron orSteel.

Types:-

1. Solid Angle plate

2. Adjustable Angle Plate

3. Box Angle plate.

ANGLE PLATE


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Solid Angle Plate:- This angleplate is most common. It has the

two plane surfaces perfectly

machined at 90 to each other.

Such angle plates are suitable forsupporting work pieces during

layout work. They are

comparatively smaller in size.

Slots are provided to clamp the

work piece and to reduce the

weight.


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Adjustable Angle Plate:-This angle plate is available to

support job in different angles.

Graduations are marked on itto set the job at particular

angle. Slots are provided on it

to clamp the job by clamping

bolts. They are available inGrade-I and Grade-II


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Box Angle Plate:-They haveapplications similar to those of

other angle plates. After setting,

the work can be turned overwith the box enabling further

marking out or machining. This

is a significant advantage. This

has all the faces machinedsquare to each other.


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Use:- Surface plates are used most widely as a datum

surface in machine shop work.

SURFACE PLATE

Material:- Gray cast iron and Granite.

Specification:- Cast iron surface plates are designated bytheir length, breadth, grade and the Indian Standard

number. i.e. C.I. Surface plate 2000 X 1000 Gr1. I.S.

2285.


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3 Point suspension

TOP

Heavy

Ribs

BOTTOM

SURFACE PLATE


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CONCLUSION

Thus we get the knowledge of Calipers,

Trysquare, Punch, Scriber, Marking Block,

Surface plate, Angle plate.


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QUESTIONS

1. List the types of Marking tools ?

2. What are the types of Calipers?3. What is the use of Scriber ?

4. What is the use of Try square ?

03 Marking Tools

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