Turret and capstan lathe Exercise - 1 Machining of typical component. External V- Thread cutting Aim :To perform step turning and thread cutting operations on capstan lathe according to the given dimensions. Tools required: Single point cutting tool, Vernier caliper Material Given : Mild Steel bar of diameter 16 mm and length/60 mm Steps : I. Facing 2. Plain Turning 3. Step Turning 4. Chamfering 5. Thread cutting Machine used : Turret and capstan lathe Procedure : Given work piece is turned according to the given dimensions by performing operation like turning and thread cutting by using turret Indexing tool head. 1. Fix the work piece in the collect chuck. 2. Perform facing and plain turning operations 3. Perform chamfering operation 4. Perform thread cutting operation Result :: The work piece is machined according to the given dimensions on Turret and capstan lathe.
Turret and capstan lathe Exercise - 2 Machining of typical component. External V- Thread cutting Aim :To perform step turning and thread cutting operations on capstan lathe according to the given dimensions. Tools required: Single point cutting tool, Vernier caliper Material Given : Mild Steel bar of diameter 16 mm and length/60 mm Steps : I. Facing 6. Plain Turning 7. Step Turning 8. Chamfering 9. Thread cutting Machine used : Turret and capstan lathe Procedure : Given work piece is turned according to the given dimensions by performing operation like turning and thread cutting by using turret Indexing tool head. 1. Fix the work piece in the collect chuck. 2. Perform facing and plain turning operations 3. Perform chamfering operation 4. Perform thread cutting operation Result :: The work piece is machined according to the given dimensions on Turret and capstan lathe.
Exercise 3 SURFACE GRINDING A i m :To perform su r fa c e grindi n g operation the surfa c e g r i n d i n g machine according to the given dimensions. Tools required : Try square, Vernier caliper, ' Materials required : Mild steel square bar of side I2mm and length160 mm Sequence of operations : Perform surface grinding operation on all four lateral surfaces one after the other. Procedure : 1. Fix one surface of the work piece on the magnetic table. Give small depth of cut by rising the table. 2. Feed the work piece slowly against the rotating grinding wheel. 3. Repeat the steps (2) and (3) until all the lateral surface of the work piece is -luniformly finished according to the given dimensions. Result: Surface grinding is done according to the required dimensions by performing surface grinding operation on the given work piece.
Execerise-4 Gear hobbing External spur gear AIM:To cut teeth of a spur gear on gear hobbling machine. Tools required : Milling cutter of 3 mm module, Vernier caliper Material Given : Cast iron gear blank Steps :According to gear blank diameter and given module of the cutter, calculate the number of -teeth. Procedure 1. From the standard table (number of teeth Vs. gear train values), select proper gear train values (no. of teeth on driver and no. of teeth on driven) according to the calculated number of teeth on spur gear. 2. The hob is set with its teeth parallel to the axis of gear blank. 3. Now fix the work piece on the rotating table. 4. Switch on the machine and depth of cut to the work piece is given manually against the rotating hobber. 5. After generating the teeth on the job for the given first pass, give the second and final depth of cut to the job to generate the complete teeth with required specifications. 6. Remove the job and check for the dimensions. Calculation : (gear hobbing) D=m(Z+2) When D =Outer Diameter (measured from the given gear blank) in = 2.117 mm (cutter module) Z = Depth of Cut No. of teeth is to be cut = (2.25) m = 2.25 x 2.117 = 4.76 mm Result: Spur gear is machined on gear hobing machine as per the required specifications
Execerise-5 Shaping cutting key ways AIM : To perform the horizontal and angular machining as per the given dimension. Tools required : Dot punch. Hammer, Spirit level. Square Tool, Steel rule, Scriber specification of Shaper : 1. Maximum length of the stroke 2. Size of the table (ie, Length, width, and depth of the table ) 3. Maximum horizontal and vertical travel of the table 4. Maximum number of strokes per minute 5. Type of mechanism. 6. Power of the drive motor operation performed: Machining of vertical surface, angular surface, horizontal - surface, curved surface, irregular surface, slot and key way. material given : Cast Iron Block 60 x 60 x 60 mm. sequence of operation: 1. Marking 2. Punching 3. Shaping 4. Key way machining Procedure : 1. Apply chalk on the two adjacent surfaces. 2. Mark the given dimensions on the work piece. 3. Punch the marked lines. 4. Fix the work piece in the machine wise and check for horizontal surface.. 5. Fix the Square -tool in the tool holder. 6. Feed the tool and move the table from left side to right side 7. Increase the depth of cut and repeat step 6 8. perform the horizontal machining and Key way machining as per the given dimension. Result.. The given cast Iron block is machined according to the given dimensions.
Exercise 7 CYLINDRICAL GRINDING Aim : To perform Cylindrical grinding operation on the cylindrical grinding machine according to the given dimensions. Tools required : Single point cutting tool, Vernier Caliper, Dogs, Centre drill bit. Material Given: Mild steel bar of diameter 25 mm and length 50 mm Sequence of erations 1. Facing 2. P l ai n tur ni ng 3. chamfering 4. Counter - si nki ng 5. Cylindrical grinding Procedure : I. The given work piece is turned according to the given dimensions by performing operations like facing and plain turning. 1. Fix the center drill bit in tailstock and perform counter sinking on both sides.. Work piece is chamfered on both sides. 2.. Fix the work piece on the cylindrical grinding and perform finishing operation, according to the given tolerance. Result: Cylindrical grinding is done according to the required dimension and tolerance by performing turning and cylindrical grinding operations on the given work piece.
Exercise No. 8 GROOVING & KNURLING Aim: Tools required: Material: Sequence of operations: Procedure: To perform grooving and knurling in lathe according to given dimensions Cutting tool, Vernier caliper, etc., Mild steel rod- 025mm x 100mm a. Marking b. Facing c. Turning d. Grooving Knurling 1. Apply chalk on the surfaces. 2. Mark the given dimensions on the work piece. 3. Fix the work piece in the chuck. 4. Fix the cutting tool in the tool post. 5. Feed the tool and machine the job to the required dimensions. 6. Fix the grooving tool and carry out grooving. 7. Then carry out knurling operation. 8. Perform the chamfering operation, according to the given dimensions. Result: The work piece is machined to the required dimensions. Grooving and knurling operations are carried out.
Exercise 9 DRILLING Aim: To perform drilling operation in lathe machine according to given dimensions Tools required: Cutting tool, Vernier caliper, drill bits etc., Material: Sequence of operations: Mild steel rod- 025mm x 100mm 1. Marking 2. Facing 3. Turning 4. Centre 5. tapping 6. Drilling Procedure: 1. Apply chalk on the surfaces. 2. Mark the given dimensions on the work piece. 3. Fix the work piece in the:chuck. 4. Fix the cutting tool in the tool post. 5. Feed the tool ind machine the job to the required dimensions. 6. Fix the drill bit securely in the tailstock, 7. Give feed through tailstock and machine hole in the work piece to the given dimensions. 8. Perform the chamfering operation, according to the given dimensions. Result: The work piece is machined to the required dimensions. Hole is produced in the work piece by drilling.
Exercise No. 10 EXTERNAL THREAD CUTTING Aim: Tools required: Material: Sequence of operations: To perform external threading in lathe according to given dimensions Cutting tool; vernier caliper, etc., Mild steel rod- 025mm x 100mm Marking Facing Turning Thrcad cutting Formula: Core diameter, d = Major diameter (2xdepth) Depth = 0.6495 x pitch Procedure: 1. Apply chalk on the surfaces. 2. Mark the given dimensions - on the work piece. 3. Fix the work piece in the headstock spindle. 4. Machine to required dimensions 5. Set the change gear 6. Fix the threading tool in the tool post. 7. Adjust speed for threading 8. Engage half nut to any one number on the thread chaser 9. Depth of cut is given through cross slide 10. After the tool has produced a helical groove to the required length withdraw the tool and disengage half nut 11. Move the carriage to the starting position and engage half nut. 12. Repeat till required depth of thread is obtained. 13. Perform the chamfering operation, according to the given dimensions. Result: The work piece is machined to the required dimensions by performing external thread cutting.