Why is a V-Notch more efficient than a rectangular notch?
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Why is a V-Notch more efficient than a rectangular notch?
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- What general trend did you observe from set-ups 3? Support your answer by using the data gathered.On the attached drawing, is the allowance between "shaft C" and "hole D" positive or negative?Example 2. energy per hole during each revolution. Each piercing takes 40 per cent of the time needed to make one revolution. The punch receives power through a gear reduction unit which in turn is fed by a motor driven belt pulley 800 mm diameter and turning at 210 r.p.m. Find the power of the electric motor if overall efficiency of the transmission unit is 80 per cent. Design a cast iron flywheel to be used with the punching machine for a coefficient of steadiness of 5, if the space considerations limit A punching press pierces 35 hotes per minute in a plate using 10 kN-m of the maximum diameter to 1.3 m. Allowable shear stress in the shaft material = 50 MPa Allowable tensile stress for cast iron = 4 MPa
- In orthogonal turning of a cylindrical tube of wall thickness 5 mm, the axial and the tangential cutting forces were measured as 1259 N and 1601 N, respectively. The measured chip thickness after machining was found to be 0.3 mm. The rake angle was 10° and the axial feed was 100 mm/min. the rotational speed of the spindle was 1000 rpm. Assuming the material to be perfectly and Merchant's first solution, the shear strength of the material is closest to%9. lu. O V;YA Q1 What is the difference between direct shear and indirect cutting? Q2_What are the factors affecting fatigue Q3_What is the difference between hardness and micro-hardness Q4_What is the fatigue limit? Q5_What is strain hardness? Q6 What is the difference between true stress and engineering stress Q7_What is the difference between true strain and engineering strain? What is the relationship that binds them? Q8_ When do the "ears" appear in drawn cup, through cup drawing tests? Q9 Could we use results of tensile tests predict impact failure behavior, why? Q10_Could you estimate ductile-to-brittle transition temperatures for metals having hexagonal close-packed structure, why? Q11 Can creep of metals happen in room temperature, when? Solve a question 1_2_3_4_5_6_7_8_9_10_11 IIDefine the term proportional limit?
- Q1. Calculate the time required to machine a workpiece 170 mm long, 60 mm diameter to 165 mm long 50 mm diameter. The workpiece rotates at 440 rpm, feed is 0.3 mm/rev and maximum depth of cut is 2 mm. Assume total approach and overtravel distance as 5 mm for turning operation. Answer Q2. A gray cast iron surface 280 wide and 540mm long may be machined either on a vertical milling machine, using a 100mm - diameter face mill having eight inserted HSS teeth, or on a horizontal milling machine using an HSS slab mill with eight teeth on a 200-mm. diameter. Which machine has the faster cutting time? The values of feed per tooth and cutting speed for both processes are 0.4mm/tooth and 80m/min, respectively. The depth of cut = 3.0 mm and assume A and O equal to 5. AnswerHandwritten solution recommended. (1) A twist drill bit is used to drill a hole of diameter 2.0 at 4578.1 rpm at a feed rate of 2.5 in/min. Calculate the MRR in in^3/min. Take "pi" = 3.14. Round your answer to the nearest tenth.A circular shape blank will be cut of mm diameter from a strip of mm with a clearance value of 0.25 mm. Take the shear strength as 400 MPa. Determine The appropriate punch diameter.Blanking force.Blanking force when the blade angle A circular shape blank will be cut of mm diameter from a strip of mm with a clearance value of 0.25 mm. Take the shear strength as 400 MPa. Determine The appropriate punch diameter.Blanking force.Blanking force when the blade angle is o.