Define the term 'Machine tool'. What are the general requirements of a machine tool?
Differentiate between working motion and auxiliary motion. Mention the drive motion and feed motion for Lathe, Milling, Drilling and Shaper machine.
Determine the machining time for turning a shaft from 70 mm diameter to 64 mm diameter over a length of 200 mm at n = 600 rpm and feed rate s = 0.4 mm/rev. The turning tool has principal cutting edge angle ϕ=45∘\phi = 45^\circϕ=45∘. Assume, approach and over travel is equal and has the value of 2 mm each. Given, depth of cut is 1.5 mm.
What is locator? Explain locating principle with necessary figures.
Compare between jigs and fixtures.
Why referencing is important for work holding devices?
How much cutting force is required for machining mild steel at cutting speed 120 m/min with depth of cut 3 mm and feed 0.2 mm/rev. It is noted that machine co-efficiency 80%.
Define machine tool. What are the general requirements of a machine tool? Explain briefly.
What is working motion of a machine tool? Classify them. Find out the drive motion and feed motion for the following machine – Lathe machine, drilling machine, shaper machine.
Calculate the machining time for drilling a 30 mm diameter through hole in a 30 mm thick plate at a speed of 30 m/min and feed 0.1 mm/tooth.
Why are speed and feed rate are regulated?
Show that the maximum loss of economic cutting speed in GP series is constant.
What information do you get from a structural formula? Draw the structural diagram for (i) Z = 2(1) 3(2) 2(6) and (ii) Z = 2(6) 3(1) 2(3). Which one is better and why?
Classify machine tools based on (i) degree of automation (ii) weight ratio (iii) degree of specialization. Also how does the working motion can be classified?
Describe the various operation of lathe machine with neat sketch.
What are the general requirements of a machine tool?
Determine the machining time for turning a shaft from ϕ70\phi70ϕ70mm to ϕ64\phi64ϕ64mm over a length of 200mm at n = 600rpm and s = 0.4 mm/rev. The turning tool has principle cutting edge angle ϕ=45∘\phi = 45^\circϕ=45∘. Assume approach and over travel have equal value of 2 mm.
Define kinematic layout and Ray diagram. Draw the structural diagram for (i) z = 2(1) 3(2) 2(6) and (ii) z = 2(3) 3(1) 2(6), which structural formula is comparatively best and why?
What is loss of economical cutting speed? Prove that maximum loss of economical cutting speed is ΔVmax=(Φ−1Φ+1)Vopt\Delta V_{max} = \left( \frac{\Phi - 1}{\Phi + 1} \right) V_{opt}ΔVmax=(Φ+1Φ−1)Vopt
Design of a machine tool is related to different engineering economic, natural and social sciences - Explain why?
The accuracy of a machine tool depends upon its geometric and kinematic accuracy - Do you support the statement? Justify your answer.
How the machining cost can be reduced?
Define machine tool. Describe the various operations of Lathe machine with proper sketches.
Identify the drive motion and feed motion with necessary figures for the following machine tools: (i) Lathe Machine (ii) Drilling (iii) Milling (iv) Shaping (v) Grinding.
What is "loss of economic cutting speed"? Show that it is constant for GP series type of gear box.
Define the term “Machine Tool”. What are the general requirements of machine tools?
Describe the various operation can be performed by lathe machine with neat sketches.
A 30 mm H. S. S. drill is used to drill a hole in a cast iron block of 115 mm thick. Determine the time required to drill the hole of feed is 0.35 mm/rev. Assume an over travel of drill as 4.85 mm. The cutting speed is 28.50 m/min.
State and deduce the relationship among maximum loss of economic cutting speed, geometric progression ratio, and optimum cutting speed of a machine tool.
Define punching and Blanking. Describe the various types of die such as (i) Inverted die, (ii) Compound die, and (iii) progressive die.
What is locator? Explain 3-2-1 locating principle with necessary figures.
Make a comparison between Jigs and Fixtures.
Why Referencing is important for work holding devices?
What is the cutting power required for machining mild steel at cutting speed 120 m/min with depth of cut 3 mm and feed 0.2 mm/rev (machine co-efficient 80%).