2. Making Paper Weight
Tools :
Bench vice, Drill machine ,meter tap ,Drill bit , Hacksaw, flat file, centre
punch , Threading die, Threading and tapping with dies , taps for sizes
upto 6 mm ,Tap range,
Required material:
6 mm bar, oil, ms flat
6. Procedure :
a) Threading
1. Fit rod into the vice.
2. Use die range to thread.
3. Slowly give back and forth motion to die.
3. Use oil for lubrication.
7. B) Tapping –
1. Drill hole of proper size on the job.
2. It is important to calculate size of hole required.
3. A slight drill can be made to fit the tap.
4. Use first type of tap, it is just oversize than the diameter of hole.
5. Depth of cut is smaller with this tap.
6. Slowly second and third type of taps are used to make deep thread cut.
7. Oil is used for lubrication and cooling.
8. Care has to be taken to insert the tap co-axially.
8. Making Paper Weight
Measure the dimensions of metal block
Hold the strip in bench vice and cut according to the
planned dimensions
Make the edges smooth by using a file and check all
the edges are in right angle to each other as shown
below
9. Making Paper Weight
Mark center on that rectangular piece
Drill hole in the center
Use tapping to mark threads on that drilled hole
Take a round bar and cut it
Use a die and do threading on bar
Now fit the round bar on the rectangular piece
10. Paper Weight
Turning direction to fit rod
Thus in this way by doing threading using dies and
taps , paper weight can be developed
11. Safety Precautions
Ensure proper tension for hacksaw blade
Always ensure the hacksaw teeth is towards forward
direction
While cutting with hacksaw , put some water on blade
because heat is generated due to friction
While using bench vice, the job must be hold tightly
While threading, release oil frequently
Use full length of file when making edges smooth