INSTRUMENTS TO BE USED
- Files
- Composed of High Carbon Steel
- Mostly have double knurling
- Used in forward stroke
- All files have 45 degree angle
- Used to Remove Chips/Waste material
Types of files - Flat
- Square
- Tri Angular
- Round
- Half Round
- Round
- Knife Edge
- Rasp Cut
Flat
- Double cut on both sides
- Single cut on both edges
- Used in general work and filing flat surfaces
- Does not produce smooth surface
- A large amount of metal can be removed
Square Files
- Double cut on all sides
- Used for enlarging of holes
- Used for filing of slats and key
Tri Angular Files
Its section is triangular
Faces are double cut
Edges are single cutEach side is on 60 degree
Used for filing angles, shoulders, corners.
Also used for sharpening wood working saws
Round Files
Usually double cut
Used for enlarging holes, slots, concave.
Half round files
It has one flat side and the other round side
Flat side is double cut
Curved side is single cut
Used for filing curved surfaces
Flat Peen Hammer
Striking tool
Consists of Hammer, Peen & Handle.
Head is made of CARBON STEEL
Both ends of Head are hardened and tempered.
Handle is made of wood
Types of Hammer
Straight Peen Hammer
Straight and tapered peen
Used for striking of metals
Bending of metals
Ball Peen Hammer
Its hammer peen is like a ball
Cross Peen Hammer
Used for hammering into shoulders
Hammering in curves
Bending of metals
Stretching of metals
Vernier Calliper
Vernier Calliper is used to measure length on job. We can also use steel rule to measure required dimensions.Tri-Square
It consists of steel blade fixed at right angle to the edge of coast iron stock.It is used for checking of right angles, the squareness and the surface and also draws line at right angle.
Hand Hexa or Hack Saw
Center Punch
A punch is primarily a marking tool used in bench work and known as center punch. This punch is used for marking Centre for drilling of holes,
Scriber
It is made of steel and one end is sharp pointed and other end is similar but bent. This tool is used for scribing line on work piece.
Operations that are Performed at fitting shop:
Filing
Scaling
Drilling
Boring
Cutting
Internal Threading (Taping)
Finishing
Filing
Filing is process of reducing the length or extra material from job.
Scaling
Process of measuring and marking the required dimensions.
Drilling
Process of making holes in Job.
Boring
Process of increasing diameter of holes
Cutting
Removal of extra part of work piece. It can be done by using Hack Saw.
Internal Threading (Taping)
Process of making threads in internal part of holes.
Taper tap
Intermediate tap
Bottom tap
Finishing
Process of cleaning of surfaces of job using emery paper.
PERSONAL ASSESMENT AT LAB
MAKE A WORKPIECE ACCORDING TO SUPPOSED DIMENSIONS,
NOTE: for your own ease Take all dimensions in mm.
Procedure according to supposed dimensions by author:
Length of given job is more than 75 mm. Reduce it 75mm by using file.
Check 90 degree angle by using trisquare.
Rub chalk on JOB to make it white.
Measure required dimensions by using steel rule or vernier.
Make line by scriber.
Use centre punch & Hammer to mark centre of holes to be drilled.
Also mark points on line separating V shaped extra portion as shown in figure.
Use Drill Machine to drill holes on job.
Increase holes diameter by process of drilling.
Use taps to perform internal threading.
Cut V shaped extra portion by using hack saw.
Check 90 degree angle of V shaped portion.
Use files to clean the surfaces of Job.
Perform finishing by using emery paper to make Job smooth and shining.
Punch your name.
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