Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
DRAGON INNOVATION, INC.
COURSE 13
BASICS OF WATERPROOFING
DECEMBER 10, 2014
WILLIAM DRISLANE | VP ENGINEERING & MANUFACTUR...
Waterproofing standards
What is being done?
• Water proof container? Like a tank, or bottle…
• Do you need to be able to open it?
• Does it have fi...
TYPES OF SEALS
O-Ring (Removable)
O-Ring, Continued
• Types of O-ring seals
• Face Seals
• Removeable
• Single-use (crushed)
• Circumferential (Gland) Seals...
O-Ring, Continued
• Factors that affect O-ring sealing performance
• Dimensions
• % Compression of O-ring
• Surface finish ...
Permanent Joints (Welding)
• Ultrasonic Welding: High frequency, low amplitude. Good for
smaller parts. Joint design is im...
Permanent Joints (Welding)
Permanent Joints (Welding)
Permanent Joints (Welding)
Protecting Electronics
• Conformal Coating. Generally a silicone
coating used to protect electronics in an
enclosure from ...
LPMS
• Low Pressure Molding
• Generally a Nylon base material
• Basically hot melt glue
• Can also get Polyester based
sys...
F$%#@!& Wires!
• If have wire bundles, there are small gaps between them.
Creates capillary action that pulls water into y...
dragon@dragoninnovation.com
Upcoming SlideShare
Loading in …5
×

Design for Manufacturing Course - Class 13 - Basics of Waterproofing

6,059 views

Published on

Next up in the Design for Manufacturing course, Bill Drislane (VP of Manufacturing and Engineering) is going to talk about waterproofing and sealing. A lot of clients have come to Dragon Innovation with a wrist mounted widget gadget and they all wanted it to be waterproofed. The entrepreneurs at least wanted the gadget to be waterproofed for showering but a few wanted customers to be able to swim with it.

Waterproofing is harder than most people would imagine. The Dragon team was able to get the Pebble watch waterproofed to 5 atmospheres and it was a lot of work. Pebble has about five buttons that operate their pushers so there is a stainless steel shaft that has to slide through a seal. Those are always the hardest to seal especially if you’re operating the button in the water as it might drive water through the seal.

You also have other issues like controls across the boundary, charging contacts that have to be waterproofed, and joints within the different parts of the housing. For something like the Pebble watch, you have the crystal to the top housing and then the top housing to the main housing for the battery contact and so on. It’s a very demanding process.

Read more about Waterproofing: http://blog.dragoninnovation.com/2015/01/06/dfm-course-13-waterproofing/

Watch the YouTube video: https://www.youtube.com/watch?v=PLcYiSStU6I

Learn more about Design for Manufacturing: http://blog.dragoninnovation.com/category/design-for-manufacturing-course/

Learn more about Design for Manufacturing: http://blog.dragoninnovation.com/category/design-for-manufacturing-course/

About Dragon Innovation

Dragon Innovation works with entrepreneurs to launch hardware products and scale companies. Founded by a team of hardware experts, Dragon provides a clear path from prototype through production with unmatched manufacturing expertise and trusted connections. Dragon's client roster includes Coin, MakerBot, LIFX, Scout, Romotive, Sifteo, Orbotix, FormLabs and over 100 more companies paving the road for how new technology gets made.

Connect with Dragon Innovation

Website: http://www.dragoninnovation.com
Blog: http://blog.dragoninnovation.com
Twitter: http://twitter.com/dragoninnovate
Slideshare: http://www.slideshare.net/dragoninnovation

Published in: Technology
  • DOWNLOAD FULL BOOKS, INTO AVAILABLE FORMAT ......................................................................................................................... ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y6a5rkg5 } ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... .............. Browse by Genre Available eBooks ......................................................................................................................... Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult,
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here

Design for Manufacturing Course - Class 13 - Basics of Waterproofing

  1. 1. DRAGON INNOVATION, INC. COURSE 13 BASICS OF WATERPROOFING DECEMBER 10, 2014 WILLIAM DRISLANE | VP ENGINEERING & MANUFACTURING | @DRAGONINNOVATE | WWW.DRAGONINNOVATION.COM
  2. 2. Waterproofing standards
  3. 3. What is being done? • Water proof container? Like a tank, or bottle… • Do you need to be able to open it? • Does it have fittings? How are you handling air in the tank? • Are you protecting electronics? • Is it permanent or replaceable? • Do you have to clean it? • Is it strong and thick enough to handle clamping loads (Space for screws) • Space constraints force a face seal? • Can you use hoop stress?
  4. 4. TYPES OF SEALS
  5. 5. O-Ring (Removable)
  6. 6. O-Ring, Continued • Types of O-ring seals • Face Seals • Removeable • Single-use (crushed) • Circumferential (Gland) Seals • Dynamic • Static • Groove design • Rectangular • Half-dovetail • Dovetail
  7. 7. O-Ring, Continued • Factors that affect O-ring sealing performance • Dimensions • % Compression of O-ring • Surface finish of groove • Direction (lay) of the grain of surface finish in groove • Chemical compatibility - O-ring and groove material • Entrapment of fluid behind O-ring - ‘burping’ and ‘virtual leaks’. • For dynamic seals • Speed, friction, and heating of O-ring • Thermal runaway driven by negative CTE. • Proper lubricant • Contamination • Temperature • —> Use Parker or Apple Rubber O-ring handbooks
  8. 8. Permanent Joints (Welding) • Ultrasonic Welding: High frequency, low amplitude. Good for smaller parts. Joint design is important, can also use specific textures. • Vibration welding: Good for larger parts. Lots of flash, needs special joint to control the flash. Melts lots of plastic. • Spin Welding. Circular joint. Heat parts by mechanical friction • Laser welding. Send IR laser through translucent part to opaque part. Laser heats weld interface. Must have strong contact between parts. Part size does not matter. • Solvent Bond: Generally MEK based solvents. Must control temp and humidity, can be messy and hard to control. Not best for hermetic seals. • RF Welding. Good for thin sheets like a bladder design. • Hot Plate welding. Good for butt joints and large parts. A bit messy.
  9. 9. Permanent Joints (Welding)
  10. 10. Permanent Joints (Welding)
  11. 11. Permanent Joints (Welding)
  12. 12. Protecting Electronics • Conformal Coating. Generally a silicone coating used to protect electronics in an enclosure from humidity and incidental contact with fluids. Main advantage is it allows parts to be inspected and re- worked. Disadvantage is not an absolute seal. • Potting: Generally Epoxies or Urethanes. Completely encapsulates the electronics. If Surface mount components used needs to remain flexible
  13. 13. LPMS • Low Pressure Molding • Generally a Nylon base material • Basically hot melt glue • Can also get Polyester based systems • Can get in different colors, durometers, adhesive properties
  14. 14. F$%#@!& Wires! • If have wire bundles, there are small gaps between them. Creates capillary action that pulls water into your electronics. • Need to try to separate them to eliminate gaps. • Strain Relief beyond seal point. If wires are flexing back and forth, seal will be effected. • Select a sealing agent that bonds well to the wires • Try to match expansion rates, or ensure sealant is flexible (RTV) • If Using RTV make sure there are no motors effected by silicone oxides from off-gasing.
  15. 15. dragon@dragoninnovation.com

×