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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Transcribed Image Text:It is required to design a fly-
press, as shown in Fig. 6.17, which is capable of
punching 50 mm diameter circles from a 1.5 mm
Rm
Ball
Ball
Nut
Screw
Handle
Pillar
Punch
Die
Fig. 6.17 Fly-press
thick mild steel sheet. The ultimate shear strength of
the sheet metal is 375 N/mm and it can be assumed
that shearing will be complete when the punch
penetrates 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 expected
to sit in front of the fly-press, insert the sheet by his
left hand and operate the handle by the right hand.
The total working stroke consists of a one-quarter
revolution, 45° in front of the press and 45° behind
the press. During the return
raised by 5 mm to provide clearance to insert the
sheet. The forward or working stroke is completed
in 1 second. The balls are made of cast iron, with a
mass density of 7280 kg/m and the radius R is 500
mm. Neglecting collar friction, calculate
(i) the dimensions of the screw;
roke, the punch is
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