ME3301 T2 ME3301: Manufacturing Technology Tutorial 2 1. A centre lathe having 12 spindle speeds has been designed for machining jobs of diameter ranging from 40 mm to 120 mm at cutting velocity in...

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ME3301 T2 ME3301: Manufacturing Technology Tutorial 2 1. A centre lathe having 12 spindle speeds has been designed for machining jobs of diameter ranging from 40 mm to 120 mm at cutting velocity in between 50 m/min and 200 m/min. What should be the lowest and the highest spindle speed of that lathe? 2. A drilling machine having nine spindle speeds in GP is to be designed for drilling holes of diameter in between 6 mm and 30 mm at cutting velocity in between 20 m/min and 50 m/min. Determine the values of all those nine spindle speeds. 3. Design a speed gear box for a drilling machine requiring six spindle speeds with common ratio f = 1.25 (≅ (2)1/3). The design of the gear box should include (a) drawing the gearing diagrams, (b) Ray diagram, (c) number of teeth of all the gears. 4. BSW thread of 27 TPI is to be cut on a lathe with lead screw of 6 TPI. Determine the required change gears. 5. A double start thread of pitch 0.5 inch is to be cut on a lathe with lead screw of 6 TPI. Determine the required change gears. 6. It is required to cut screw thread of pitch 3 mm on a lathe with lead screw of pitch 10 mm. Determine the required change gears. 7. It is required to cut screw thread of pitch 1.5 mm on a lathe with lead screw having BSW thread of 2TPI. Determine the required change gears. 8. It is required to cut modular thread on the worm of a worm-worm gear pair of module 4 mm on a lathe with lead screw of pitch 6 mm. Determine the required change gears. 9. Determine the required crank rotation of the indexing head to index for (i) 33 divisions (ii) 24 divisions (iii) 5 divisions 10. Five helical flutes of pitch 500 mm have to be milled on a job of diameter 500 mm on a milling machine with a lead screw of pitch 6.35 mm. Determine the required crank rotation, table setting angle and change gears.