ACADEMIC CAD PORTFOLIO Alex Haesche

February 17, 2015

2

3

Contents Contents ........................................................................................................................................................ 3

Table of Figures ............................................................................................................................................. 4

General Information ..................................................................................................................................... 6

Outside Work ................................................................................................................................................ 6

Advanced CAD ............................................................................................................................................... 7

Shoulder Screw with Threads ................................................................................................................... 7

Spinning gears ........................................................................................................................................... 8

Torah Project ............................................................................................................................................. 9

Hatch ....................................................................................................................................................... 10

Hatch – Geometric Dimensioning and Tolerancing ................................................................................ 11

Key Technologies Camera Mount ........................................................................................................... 12

Finite Element Methods .............................................................................................................................. 14

Intro to CAD ................................................................................................................................................ 16

Kinematics ................................................................................................................................................... 17

Four-bar Assembly .................................................................................................................................. 17

Cam ......................................................................................................................................................... 19

Machine Element Design Lab ...................................................................................................................... 22

Manufacturing Systems Engineering .......................................................................................................... 23

Vibrations .................................................................................................................................................... 24

3DConcpet Work ......................................................................................................................................... 26

4

Table of Figures

Figure 1 Shoulder Screw ............................................................................................................................... 7

Figure 2 Shoulder Screw Initial Sketch .......................................................................................................... 7

Figure 3 Shoulder Screw Thread Profile ........................................................................................................ 7

Figure 4 Personalized Rotating Gears ........................................................................................................... 8

Figure 5 Torah Handles Made From Pictures................................................................................................ 9

Figure 6 Hatch Part ..................................................................................................................................... 10

Figure 7 Hatch Sketch ................................................................................................................................. 10

Figure 8 GDT of Hatch Model ...................................................................................................................... 11

Figure 9 Camera Mount .............................................................................................................................. 12

Figure 10 Mass Analysis of Camera Mount ................................................................................................. 12

Figure 11 Camera Mount Displacement at 43Hz ........................................................................................ 13

Figure 12 Transmissibility Plot of Various Mounts ..................................................................................... 13

Figure 13 Elemental Analysis of Heat through Heatsink ............................................................................. 14

Figure 14 Placement of Nodes on Crane .................................................................................................... 15

Figure 15 Application of Loads .................................................................................................................... 15

Figure 16 Displacement of Crane Members ............................................................................................... 15

Figure 17 Hole Stress .................................................................................................................................. 15

Figure 18 Tape Dispenser ............................................................................................................................ 16

Figure 19 Four-Bar Assembly ...................................................................................................................... 17

Figure 20 Four-Bar Assembly Adjusted ....................................................................................................... 17

Figure 21 Four-Bar with Curves and Instant Center ................................................................................... 18

Figure 22 Four-Bar with Instant Centers Labeled ....................................................................................... 18

Figure 23 Cam in AutoCAD .......................................................................................................................... 19

Figure 24 Cam in MATLAB ........................................................................................................................... 19

Figure 25 Pressure Angle vs Cam Rotation ................................................................................................. 20

Figure 26 Position, Velocity, and Acceleration vs Cam Rotation ................................................................ 20

Figure 27 Cam and Follower in Creo ........................................................................................................... 21

Figure 28 Gears Made in AutoCAD ............................................................................................................. 22

Figure 29 Process of Making a Gear............................................................................................................ 22

Figure 30 Yo-yo Holder ............................................................................................................................... 23

Figure 31 Tower .......................................................................................................................................... 24

5

Figure 32 Four-bar Tower Modal Analysis .................................................................................................. 25

Figure 33 Oven Knob – Front Detail ............................................................................................................ 26

Figure 34 Oven Knob – Back Detail ............................................................................................................. 26

6

General Information

The figures shown in this portfolio were made by Alex Haesche as part of the distribution requirements

at Walla Walla University. Most figures were created with Creo Parametric, other figures may have been

made in other software: it is noted where applicable.

Outside Work

As well as the work presented in this portfolio, I have successfully completed tutorials in the following

programs:

Autodesk Inventor Professional 2015

o Packaged Tutorials

o Sheet Metal Parts

o Sheet Metal Parts 2

o Plastic Parts and Features

o Equation Curves

o V-Belts Connections

o Disc Cams

o Compression Springs

o Substitute Level of Detail Representations

o Splines and Surfaces

o Shafts

o General Mold Workflow

o Family Mold Design

o Core and Cavity Considerations

o Frame Analysis

o Frame Analysis Results

o Modal Type of Frame Analysis

Creo Parametric 2.0

o Introduction to Creo Parametric 2.0 - Fundamentals

o Introduction to Creo Parametric 2.0 - Productivity Tools

o Introduction to Creo Simulate 2.0

o Mechanism Design using Creo Parametric 2.0

o Mechanism Simulation using Creo Parametric 2.0

o Update to Creo Parametric from Creo Elements/Pro 5.0

7

Advanced CAD

Shoulder Screw with Threads

This screw was made to demonstrate how to use a helical sweep.

While a helical sweep is the incorrect way to make threads, our professor

thought it would be a good learning opportunity since everyone was

familiar with threads.

Figure 2 shows how this part was started: with a

sketch then revolve.

After revolving and completing the head design, the hard part of making the threads begun. The most

difficult part of making the thread was setting up the sweep profile correctly. Some of my classmates

were making the threads using a triangle with a foot so that the threads would have flats between each

other. I figured out how to make threads without the foot on the triangle. You can see the sweep

section in Figure 3.

Figure 1 Shoulder Screw

Figure 2 Shoulder Screw Initial Sketch

Figure 3 Shoulder Screw Thread Profile

8

Spinning gears

I made this part in such a way that I

could print it on the school’s Fortus

200mc 3D printer.

I did not make the gears myself, but

rather was supplied with a universal

gear file. With this file I was able to

define a few things (such as diameter,

teeth, etc.) and the file would update as

appropriate.

This example demonstrates proper

dimensioning of part’s height and

specific placement of a part in an

assembly, along with text placement.

This assembly is set up with collision on, this means that one gear can be rotated, and the other will also

rotate. This was necessary so that the print would be able to move like the CAD model does.

Figure 4 Personalized Rotating Gears

9

Torah Project

My professor thought it would be a good idea to show us the wrong way to make parts from an image.

The method he had us use was to make a stock part and texture it with an image file. After that was completed, we were to trace along the edge that we wanted, and to revolve that, making the shape we wanted. In this case it was handles for a Torah, seen below.

Figure 5 Torah Handles Made From Pictures

10

Hatch

The hatch, as it was called in our textbook, was difficult due to its complexity. As seen in Figure 7, a lot

went into making all the features in the correct

location.

Figure 6 Hatch Part

Figure 7 Hatch Sketch

11

Hatch – Geometric Dimensioning and Tolerancing

Figure 8 shows the dimensions and tolerances that the textbook had for us to add.

Figure 8 GDT of Hatch Model

12

Key Technologies Camera Mount

Key Tech is right down the road from Walla Walla University, at times they will come to us

for help, or just to off load some of their work onto us. The next

series of pictures is from a problem they had with a camera

mount.

Key Technology wanted a camera to watch how food was

being processed with their machine, but the image was unsteady

at the frequencies the system was being driven. Their task for

us was to redesign their camera mount. Given their

requirements, all we were allowed to do was change the

length of the arms and their attach points, and the position

of the camera.

Figure 9 is my final result; the result that most everyone

in class came up with.

Figure 10 Mass Analysis of Camera Mount

Figure 10 shows the part we were given, after we idealized the camera as a cylinder and set mass

properties.

Figure 9 Camera Mount

13

Figure 11 shows how the system

reacts at the driven frequency. For

this system is it 43 Hz.

Figure 12 shows the

camera mount

transmissibility for the

original design, worst-,

and best-case scenario.

This plot was made in

MATLAB, the zeta values

were calculated in Creo

Parametric.

The x- and y- labels are

using the LaTeX

interpreter. This is so that

the subscripts and

fractions turn out the way

I wanted them to.

Figure 11 Camera Mount Displacement at 43Hz

Figure 12 Transmissibility Plot of Various Mounts

14

Finite Element Methods

I have used ANSYS in for heat transfer and load analysis. The following are a few pictures of work I have

done for class.

Figure 13 Elemental Analysis of Heat through Heatsink

In Figure 13 heat transfer from the bottom edge of the block can be seen decreasing towards the top.

15

Figure 14 shows setting up nodes for this model of a

crane.

Figure 15 shows the placing of loads.

Figure 16 shows the deflection caused by the loads.

Figure 17 shows how stress develops around a circular

hole. This is a simplified model, thanks to the part being

symmetrical.

Figure 14 Placement of Nodes on Crane

Figure 15 Application of Loads

Figure 16 Displacement of Crane Members

Figure 17 Hole Stress

16

Intro to CAD

For the final project of Intro to CAD, we were

to replicate a physical object in Pro E Wildfire.

This is an example of the parts that my team

was working on. This is the handle and base

of a masking tape dispenser.

Figure 18 Tape Dispenser

17

Kinematics

Four-bar Assembly

This assembly was made to

demonstrate how a four-bar works.

The blue line shows the coupler curve;

the path of the right most hole.

The Figure 20 shows the same assembly, but with the input arm rotated. This demonstrates how the

right most hole follows the coupler curve when the input angle changes.

Along with making our four-bar in Creo Parametric, we made it in MATLAB, this allowed us to see how

the equations worked.

Figure 19 Four-Bar Assembly

Figure 20 Four-Bar Assembly Adjusted

18

Figure 21 shows the same four-

bar as Figure 19, but with the

paths of all the joints, and an

instant center of two points.

I have a script that shows

Figure 21 animated, the input

angle changes from 60°, where

it starts, to about 400°.

Figure 22 shows the four-bar,

made in AutoCAD, with

distances to instant centers of

velocity labeled.

Figure 22 Four-Bar with Instant Centers Labeled

Figure 21 Four-Bar with Curves and Instant Center

19

Cam

The cam project was a long one that required multiple programs. First I had to create a cam in AutoCAD,

then export the drawing to CADKEY. Once in CADKEY, and with some finagling, I was able to save the

points as a file type that Creo Parametric would accept for use in a sketch. After making the sketch, I was

able to extrude the resulting shape as the cam that I had created in AutoCAD.

Figure 23 shows the cam with circles at interesting points.

Our assignment with this was to print it off, and draw and

measure pressure angles by hand. The circles are points of

interest.

Figure 24 shows the same cam made in

MATLAB.

Figure 23 Cam in AutoCAD

Figure 24 Cam in MATLAB

20

Figure 25 shows the pressure

angles at different cam angles,

this was used to verify my

work with Figure 23.

Figure 26 shows the

displacement, velocity, and

acceleration of the cam at

different angles. The blue

line is the MATLAB

calculated results using the

equations from my

textbook, the red dashed

lines are the results from

Creo Parametric.

Figure 25 Pressure Angle vs Cam Rotation

Figure 26 Position, Velocity, and Acceleration vs Cam Rotation

21

Figure 27 shows the final results of the

CAD work with the cam. I have a mpg

file of the cam rotating and the follower

moving along with the rotation.

Figure 27 Cam and Follower in Creo

22

Machine Element Design Lab

In class we were presented with a question: is it time to replace this pump? We were told at what rpm it

spins at, and what its output is supposed to be. Our task was to recreate the gears in AutoCAD and

decide if the output was close enough to the advertised value.

Figure 28 shows measuring of the volume between the gears, one step in my analysis.

Figure 28 Gears Made in AutoCAD

Figure 29 shows a step in the creation of gears. I

made a quarter of the gears, and rotated the

results three times.

Figure 29 Process of Making a Gear

23

Manufacturing Systems Engineering

The quarter long project we were tasked with was to make an assembly line for a yo-yo. This included

making a yo-yo in a CNC lathe, which required learning G-code, along with designing and assembling a

series of mechanisms for putting together the yo-yo.

My team’s design incorporated a twelve stage turret, which would hold the yo-yos in place while

mechanisms would place O-rings, a bearing, the other half of the yo-yo, and finally a set screw to hold it

all together. I volunteered to make the yo-yo holder, seen in Figure 30.

Figure 30 Yo-yo Holder

24

Vibrations

To demonstrate how vibrations affect displacement,

we built a tower and vibrated the base. We compared

the CAD results with the measured results we got

from the lab. Figure 31 shows a model of our tower

Figure 31 Tower

25

Figure 32 shows the different displacement styles and the first four modal frequencies.

Figure 32 Four-bar Tower Modal Analysis

26

3DConcpet Work

While I was at WWU, I worked for 3DConcepts, a business run by the engineering department. What this

business did was reach out to the community for jobs that required a 3D printer.

One Job I had was to recreate an oven knob for an old stove. The client gave me the knob to recreate;

these are the results.

Figure 33 Oven Knob – Front Detail Figure 34 Oven Knob – Back Detail