Capital University of Science &
Submitted to Sir Saqib
Amir
Technology
Performed by:
Usama Farooq
BME183126
Afaq Khalid
BME183123
Talha Zeb
BME183127
Waleed Usman
BME183124
Manufacturing a pen holder on a lathe machine
This
Monday, 22nd October 2018
Objectives:
1.
2.
Learn and practice various machine operations like facing, drilling, center drilling,
turning, taper turning, and parting.
Carry out this experiment safely.
Materials Required:
Workpiece material: Brass rod
Workpiece size: 19mm diameter and 80mm length
Required Shape:
Tools/Parts of Machine Used (Some of the
pictures given below):
1.
Three Jaw Chuck
2.
Spanner
3.
Vernier Calipers
4.
5.
6.
Parting tool
Tap set
Center drill
7.
8.
9.
10.
11.
Two drills having diameters 4mm and 10mm
Turning tool
Taper turning attachment
Bench vice
File set
Machine operations list:
1.
2.
3.
4.
5.
6.
Facing the stock end
Center drilling
Turning cylindrical surfaces
Taper turning
Threading
Parting the extra part
Procedure Outline:
1.
Get a Brass rod
2.
3.
4.
5.
6.
Grip the piece
Facing operation
Drilling the center of the rod
Various turning operations
Taper turning
Procedure (detailed):
Before starting, have an extensive look at the drawing so it is clear for us what and how to
design. First of all bring an alloy rod e.g.: steel, brass, brass, etc. In this case, brass was used. Its
diameter should be approximately 19-20mm. Measure it using a Vernier Calipers. It should have
a length for about 80mm. Check this using a scale or meter rule. Grip the rod tightly in the three
jaw chuck and upto the point where the operation has to be done. Fix the cutting tool in a right
position. Now we are ready to perform the first machine operation. Facing of the rod done for a
few seconds. Drill at the center of rod using the 4mm drill bit to mark a reference point by
supporting it by the dead center on the tailstock. Start turning on a trial basis to get a better idea.
Then final turning of the rod has to be done upto 15mm. Now check again and again the
diameter by using the Vernier Calipers, either it is upto 15mm or not. Our requirement was to
apply turning to the whole piece so we removed and placed again to perform it on the remaining
side. Attach the 10mm drill bit at the dead center on the tailstock and drill the object up 10mm
diameter. According to figure, we performed turning again upto 12mm but left the 1mm part of
length so that we can have a tip. Measure this using a Vernier Calipers again. Detach the object
from the lathe machine. Now, carefully check the dimensions using relevant measuring tools
e.g.: Vernier Calipers, scale, meter rule, etc. This is because we will move to the most important
operation of this machine. Next, we need to perform taper turning which gives the actual shape
to the object according to the figure. Taper turning was done at an angle of 7 degrees upto 16.5
mm to obtain a conical shape. Then fix the object in the bench vice. Last but not the least, use the
metric tap set of M5 size for threading the drill diameter upto 4mm. Finally, we have
successfully able to manufacture a pen holder using the lathe machine!
Safety Precautions:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Wearing an overall suit (the very first and the most important part before starting any
mechanical workshop experiment).
Listen to the instructor carefully to get the directions.
Critically study the parts of lathe machine before using it.
Make sure that the chuck is securely tightened onto the lathe spindle.
Wear safety goggles.
While the machine is running, do not come near to the prime mover (motor) or the
moving rubber belt.
Do not be on the left side of the person who is using the lathe machine.
Let the user operate the machine himself.
Never perform things quickly or be too lazy. Keep a balance.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Do not daydream while using the machine.
Remove the chuck key immediately after using.
First start the machine, then pull the lever towards yourself for performing an operation.
While finishing an operation, push the lever before turning of the machine.
Avoid the sharp edges to the newly performed object.
Do not wear the student card while working on the machine.
Stop the machine first when removing the object from the chuck.
Beware operation performed object would be hot, so be careful while touching it.
Don’t cut the object completely through when turning between centers.
Do not grasp or touch chips or turnings with your fingers, but get rid of them using a
blunt instrument. It is safer to turn off the lathe before clearing chips than to leave it
running.
Turn the chuck by hand before turning on the power to be sure there is no binding or
clearance problem.
Stop the machine before taking the measurements.
Before cleaning the lathe, remove the tools from the tool post and tailstock.
21.
22.
Overall Suit: