The purpose of this lab was to gain an understanding of a few general machining processes through hands on operation while manufacturing a bolt. For this lab we were introduced to two machines available in the machine shop. The first piece of equipme

8.107, 108, 116, 126, 129, 130, 136
8.107 Assume that in orthogonal cutting, the rake angle is 10. Plot the shear plane
angle and cutting ratio as a function of the friction coefficient.
Note from Eq. (8.12) that = tan1 . The shear angle can be estimated,

Solutions to Injection Mold Homework
1a. Width and height of the trapezoidal cross-section of tertiary runner:
Total runner length from sprue to gate is 9.25in. From table on page 17 of handout, the effective
diameter for high density polyethylene with ru

2.1-3, 47-49, 51, Gd. 59-61
2.1 Can you calculate the percent elongation of materials based only on the information
given in Fig. 2.6? Explain.
Recall that the percent elongation is defined by Eq. (2.6) on p. 33 and depends on the
original gage length (lo

5.1,2,9,26,27, 59,60,70,73, 88, 96. Gd.69
5.1 Describe the characteristics of (1) an alloy, (2) pearlite, (3) austenite, (4) martensite, and
(5) cementite.
(a) Alloy: composed of two or more elements, at least one element is a metal. The alloy may
be a so

Homework #3 solution
1). Surface profile in Sine wave; find Ra, Rq
2
1 l
2 l a sin
x a sin( x) dx
Ra
d let
0
0
2l
2l
=
=
a
l
a l
a
x)
cos x cos 0 cos
l
l
d ( cos
a
l
0
l
l
l
0
[1 ( 1)]
2a
2
2
2
a sin x
[ a sin x]
dx]1 / 2 Rq [
dx]1 / 2
0
0
2l
2l

DREXEL UNIVERSITY
Machining A Bolt
MEM437: Manufacturing Processes I
Leila Aboharb
Daku
April 24rd, 2012
1. Purpose of Lab
The purpose of this lab was to expose students to the Drexel Machine Shop by having them engage themselves
in the machining of a sta

Discussion 3 & 4
During this lab there were no real problems other than the ones mentioned above about
decoding the code. When doing this lab the problems that arose were from the CNC code itself. A lot of
the problems came from some parts of the code tha

Homework #3 solution 1). Surface profile in Sine wave; find Ra, Rq Ra =
2l
a sin 2l
0
2 1l x a sin( x)dx d let = 0 2l l l
0
a ll al a cos x = [ cos 0 cos ] = 0 d ( cos x) = l l l a 2a = [1 (1)] = Rq = [
2l 0 2 2 a sin x [a sin x]2

Solutions to Injection Mold Homework
1a. Width and height of the trapezoidal cross-section of tertiary runner: Total runner length from sprue to gate is 9.25in. From table on page 17 of handout, the effective diameter for high density polyethylene wi

Chapter 10 Properties and Processing of Polymers and Reinforced Plastics; Rapid Prototyping Tooling
10.1 The mechanical and physical properties of plastics are: a) Thermoplastics are about two orders of magnitude less stiff than metals. Their ultimat

DEPARTMENT OF MECHANICAL ENGINEERING AND MECHANICS
COLLEGE OF ENGINEERING
DREXEL UNIVERSITY
COURSE :
INSTRUCTOR:
OFFICE HOUR:
COURSE INFORMATION
MEM 437 & 687/501, MANUFACTURING PROCESSES I
Tuesday, 6:00-8:50 PM, Spring, 2010-2011
DR. JACK G. ZHOU (TEL: 2

Procedure
For this lab the first part of the process was to mix the plastic and color pellets together to create
the material being used for the modeling. After those two were mixed the next step was to load the
plastic into the hopper. Once the machine w