Design-for-Assembly Is Crucial to Design Success

NO RATINGS
View comments: newest first | oldest first | threaded
<< First   < Prev   Page 2 of 2
Douglas Alexander
User Rank
Blogger
Re: DFA is crucial
Douglas Alexander   2/19/2013 10:14:34 PM
NO RATINGS

@William, I like the term "Business at Home." There are many times where I had to leave the company to go to a sheet metal or machine shop to watch the production process and learn what needed to be changed to better accomodate volume production. I also spent a lot of time at contract manufacturers to watch the intial assembly proceses, especially where 2nd operations like hand insertions added cost to the fab process. By being close to the outside contractors, we were able to keep an eye on quality and statistical process controls and react accordingly. There are definite advantages to keeping "Business at home."

William K.
User Rank
Production Synthesizer
DFA is crucial
William K.   2/19/2013 8:41:02 PM
NO RATINGS

Stories like this prove that good communication and broader skill sets are quite valuable. It also shows that designers must be familiar with the manufacturing capabilities and limitations. Those capabilities and limitations change with time, so a smart designer will keep up the communications with the manufacturing group. That is one more reason for keeping the manufacturing part of the business at home, where communications are simpler and can be much fas6ter, and sometimes a lot more truthful.

Douglas Alexander
User Rank
Blogger
Re: interesting post
Douglas Alexander   2/19/2013 6:41:49 PM
NO RATINGS

@Flyingscot, I just reread your post and saw that the enclosure was made of plastic with some kind of humiseal and that breaking the seal would compromise the enclosure. I now understand that the PCB was mounted inside the enclosure and that it was not in itself conformally coated. This means a flexible bore scope could see a large region of the PCB and zoom in. I had one of these FO scopes at Microsoft and it was really fun to play with. It was outfitted with a camera and I could see under BGA packages, inside of switches, and scan for corrosion on connector leads. 

Douglas Alexander
User Rank
Blogger
Re: interesting post
Douglas Alexander   2/19/2013 6:35:04 PM
NO RATINGS

@Flyingscot...Wow! What a great example. If the encapsulant is the same formula as commonly used with conformal coatings on PCBs, it must have been like drilling through amber. How did you all know where to do the drilling such that you saw just the target chip, or was the encapsulant over the entire enclosure and there was open space above the PCB? Then the bore scope would have to have been flexible and wide angle to view the target chip. I'm curious as to the details. Can you say more? I suppose you could have used a stuffing diagram along with the PCB CAD to plot the incursion site and align the drill accordingly, but I am really curious on how long the process took and the methods and equipemnt used.

FLYINGSCOT
User Rank
Supply Network Guru
interesting post
FLYINGSCOT   2/19/2013 3:53:12 PM
NO RATINGS

I feel for the design team when they screw ups occur.  They are frustrating when they happen and sometimes hard to avoid.  We had a similar one where we build the PCBs inside plastic watertight enclosure which cost a lot of dosh.  Later we found that we were not sure of the version of a key chip inside the enclosure but opening the enclosure would wreck it.  Workaround was to rent a fancy boroscope and drill a tiny hole in the enclosure to peek at the chip version.  We then gooped the hole with fancy epoxy that was watertight.

<< First   < Prev   Page 2 of 2


More Blogs from Best-Practices
The robotics revolution has transformed industries from cars to electronics. Now it's optimizing a supply chain near you.
Conflict minerals research expedited by third-party services and tools will become as essential as the polluted air you breathe.
Companies fighting conflict mineral rules face an uphill battle. By embracing these rules, they can rebuild the public trust and please investors.
Radio frequency identification device technology is rapidly gaining interest by assuring the integrity of supply chains through rules-based management.
Increasing carrying capacity with giant oceangoing freighters can reduce shipping cost per 20-foot container by as much as 40 percent.

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Latest Poll
EBN Dialogue / LIVE CHAT
EBN Dialogue enables you to participate in live chats with notable leaders and luminaries. Open to the entire EBN community of electronics supply chain experts, these conversations see ideas shared, comments made, and questions asked and answered in real time. Listed below are upcoming and archived chats. Stay tuned and join in!
Archived Dialogues
Live Chat 4/3: Business Networks Emerge as Procurement's Future
Rachel Spasser, SVP and CMO at Ariba, discusses the key elements of a strong business community.
Live Chat 3/27: Finding the Procurement and Technology Sweet Spot
Increasingly, choosing the right software and technology tools is critical to empowering procurement to realize strategic advantages.
The Velocity Report Archive
Click here to see our newsletter archive.
EBN Newswire
THIEF RIVER FALLS, MN   4/15/2014
Digi-Key Debuts Innovative Mobile App for Freescale
SANTA MONICA, CA   4/9/2014
Master Electronics Acquires Electro Sonic
Twitter Feed
EBN Online Twitter Feed