Page 79 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

• Remove the job from lathe, hold on bench vice and make the thread of M8 using tap.
• Remove the burrs.
• Repeat the above for other knob.

TASK 3: Making jig bush
• Check the raw material.
• Hold the job in three jaw chuck.
• Face, centre drill and enlarge the hole to dia 5.8mm.
• Ream the hole Æ 6mm.
• Turn dia 18mm to required length.
• Turn step of dia 12mm to a length of 15mm.

• Chamfer the end of dia 12mm.
• Part to a length of 21mm.
• Repeat the same for 4 pieces.
• Hold the dia 12mm and face the other side to a length of 20mm.
• Chamfer as per drawing.
• Remove the burrs.

TASK 4: Making hook bolt
• Check the raw material.
• Bend the rod as per drawing using anvil and hammer.

• File flat surface as per section ‘AA’.
• Chamfer the length side for threading.
• Make thread using 8mm hand die with stock.
• Check the thread using Æ 8mm nut

• Finish as per drawing.
Drill jig assembly
• Clean all the parts.
• Deburr sharp corners if any.
• Fit the bush (Task 3) in the top plate (Task 2).
• Fix the Æ 6mm X 16mm dowel pin on the top plate.

• Fix the hook bolt 2 nos.
• Screw the knob in hook bolt.
• Insert the channel to be drilled.
• Now the drill jig is ready for drilling.

64

CITS : C G & M - Fitter - Exercise 66