1. Resume of Jeff Chang
Jeff Yi-Chieh Chang
7F.-1, No.141, Wanning St., Taipei City 116, Taiwan (R.O.C)
Tel: (02)2239-7631 Mobile: 0927-830-897
Jeff0214@msn.com
EDUCATION
National Taipei University of Technology
Major: Mechanical manufacture studies 09/2006~01/2009
WORKING EXPERIENCE
 Delta Electronics, INC
Mechanical Engineer 05/2004~01/2009
 Design metal and plastic model for ODM.
 Tooling cost and manufacturing estimate.
 Plan the production flow path.
 Production process problems improve.
 Product package design.
 Hewlett-Packard Personal System Group Commercial NB
Mechanical Engineer 10/2009~12/2012
 DFM review with supplier and feedback the design suggestion to ODM.
 Design review with ODM and supplier to have tooling / ME structure enhancement.
 Leading Tablet PC, 10.1’’ NB, 14’’/15’’ NB ME design and drive manufacturing yield.
 Leading painting process to enhance the yield.
 New patent apply on Water-borne paint.
GTK Mechanical Manager 01/2013~now
 Leading the team members (8 people) and set up the GTK rule for ODM and
suppliers.
 Leading the manufacturing process and review the design to find out the best
solution from mass production standpoint.
 Deal the business / strategy with suppliers.
 Co-work with procurement team on cost evaluations / process improvement / yield
enhance.
 Working with architecture team to have innovation process / design.

2. Resume of Jeff Chang
SKILL
 Languages:
 Fluent in Mandarin.
 Moderate in writing, reading, speaking and listening English.
 Understands slightly in Japanese.
 Computer Application :
Word, Power Point, Excel, Visio and Outlook.
 Software Application:
 3D in PRO/E, Solid works
 2D in Auto-CAD
 Art designing in illustrator, Photoshop, CorelDraw
PERSONALITY
 Strong motivation to explore new opportunities and new things.
 Face up challenges with optimistic attitude.
 A good team player, strong in communication and coordination.
 Independent worker with self-organization and self-motivation.
Working experience in the past job
1. Plastic and metal ODM design. When design the metal parts need to notice below:
1.1 Metal pars (general metal):
a. Material define: SGCC / SPCC / SECC.
b. Thickness: 0.5、0.6、0.8、1.0mm.
c. Surface finish: Electro coating / painting (powder or liquid).
d. When material is aluminum, we usually do a small indentation on the bending line.
e. Need to notice the resilience.
f. When the tooling is progressive die, the raw material should keep buffer for holder.
1.2 Metal parts (aluminum):
a. Define thermal conductivity.
b. Material define: ADC12 / ADC10 / ADC3

3. Resume of Jeff Chang
c. Avoid thickness over thin (general define is under 0.7mm)
d. Define draft angle: the product height is 30mm and draft angle can design 1.5~2.0 degrees.
e. Surface finish: Anodizing (black or nature) / electroplate / sandblasting.
1.3 Plastic parts
a. Define raw material: PC / ABS / PBT / PC+ABS / PPO
b. Color: White / black / beige
c. General thickness: 0.8~2.5mm
d. Flammability: UL94V0~HB
e. When the parts need add ribs and the height of rib can be product plus 0.7 times.
f. Define the draft angle
g. When assembly the A and B parts we can design over interference 0.1~0.2mm because the
plastic has resilience.
h. Using the hock to fix the PWB need to consider the location can not interfere with
component. The hock design needs a radius to avoid PWB bending or Sn-crack.
i. Need to check the plastic material thickness to avoid the shrink mark.
2. Tooling quotation and tooling forming estimate
2.1 Bending tooling (cost effect)
a. Bending tooling belong to stage die or progressive die.
b. Checking the stage number is reasonable or not.
c. After bending need fixture or not.
d. Waste material confirm in progressive die.
e. EDM path confirm.
2.2 Injection mold (cost effect):
a. How many tons of machines do we use?
b. Use three plates or two plates for injection.
c. Mold steel define: NAK80 or SKD11.
d. Cycle time define.
e. Use auto-catch or human catch for product.
2.3 Die-casting with cosmetic finished

4. Resume of Jeff Chang
a. Die-casting tons design and following process design.
b. Setting the painting process and design it.
2.4 CNC parts
a. Review the CNC design efficiency and check the cycle time reasonable or not.
b. Capacity review.
c. Verification process set up.
d. Set up the design concept.
Please refer the details as attachment (3 PPTs).
2.5 Tooling forming estimate
2.5.1 Stamping tooling
a. Avoid the cutting tool too small to broken.
b. Notice the rolling leaning in progressive die.
2.5.2 Injection mold
a. Must add slot in male or female mold surface and the depth is around 0.2mm.
b. Ejecting can not let the product to change shape.
c. Need to run a initial mold flow simulation.
d. If the product have injection shrink, need to check the injection pressure and air in the mold
or not.
e. Product material thickness partial cause the shrink mark.