Do please It is required to design a fly-press, as shown in Fig. 6.17, which is capable ofpunching 50 mm diameter circles from a 1.5 mmRmBallBallNutScrewHandlePillarPunchDieFig. 6.17 Fly-pressthick mild steel sheet. The ultimate shear strength ofthe sheet metal is 375 N/mm and it can be assumedthat shearing will be complete when the punchpenetrates through half the thickness of the sheet.The screw, with square threads, is made of steel 30C8(S = 400 N/mm), while the nut is made of bronze.The factor of safety is 3. The operator is expectedto sit in front of the fly-press, insert the sheet by hisleft hand and operate the handle by the right hand.The total working stroke consists of a one-quarterrevolution, 45° in front of the press and 45° behindthe press. During the returnraised by 5 mm to provide clearance to insert thesheet. The forward or working stroke is completedin 1 second. The balls are made of cast iron, with amass density of 7280 kg/m and the radius R is 500mm. Neglecting collar friction, calculate(i) the dimensions of the screw;roke, the punch is

Answered: Image /qna-images/answer/b05df91c-d420-4a23-acdc-5af3b560bce4.jpg

Answered: Nut Screw Handle Runch

Engineering

Mechanical Engineering

Nut Screw Handle Runch

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Gentlemen, please help to solve a,b,c as I faced confusing questions about screw jack. Conditions are: screw jack is lifting 3.2 tonnes, screw pitch is 12 mm, diameter of the screw is 5 mm. Coefficient of friction was not given but I think we will need it for total force calculation, lets take it 0.2. a) Calculate horizontal component to move the load - what is ment here by horizontal component? b) Calculate vertical component to move the load - what is ment here by vertical component? c) Total force needed to move the load with a lever of 0.82m d) Velocity ratio (VR=distance by effort/distance by load) Distance by effort (lever)=2 x 3.14 x 0.82 = 5.15m Distance by load = pitch= 12mm= 0.012 m VR=5.15/0.012= approx 429. e) Calculate efficiency. For this we need to have MA (mechanical advantage). It can be calculated when we know total force. Efficiency=Load (3200 x 9.8) / effort
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F, = 50 N F2 = = 40 N -5 45° F1 = 20 N