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MEG 440
Fall 2003
Project #2
Design
a hand-operated a punch press similar to the one shown below (source: http://www.mcmaster.com/
). The press should be able to cut holes up to 5/8” in diameter in 1/16”
sheet metal plates. The major difference is that that your press will use
power screw. Instead of rack and pinion. You are to choose materials and
dimensions such that no component will fail due to normal operating
conditions. The following are brief overview of the major design steps:
a.
Create a sketch of your overall design that includes all
relevant components.
b.
Design means to attach the tool to the screw. The attachment
method should allow some relative motion. It should also be designed for
quick assembly and disassembly.
c.
Your design should have the powerscrew
nut as a separate piece.
d.
Use principles of mechanics of materials to find the maximum
punching force.
e.
Use statics to find the torque needed
to generate this force.
f.
Relate the force to human arm force in order to calculate the
length of the press arm. Use a handbook on human factors to find out
human force.
g.
Calculate the height of the powerscrew
nut
h.
Use the results of the previous steps to select the powerscrew and nut. Follow and document selection
procedure. Be sure that the powerscrew will no
buckle under the load.
i.
Design the press frame.
j.
Select the bolts that hold the frame to the worktable.
k.
Create a set of engineering drawings that can be used to
manufacture the press. It is preferred to use a solid
modeling software at this step.
l.
Create list of components as explained in the first handout of
the semester (http://www.me.unlv.edu/~mbt/440/Project_Format.html
).
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