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April 2011

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From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Sat, 9 Apr 2011 20:41:41 -0400
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Buy a aluminium baking try for thx giving with lid? :-) plus pink bubbles sure look cute. 
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----- Original Message -----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Saturday, April 09, 2011 08:22 PM
To: [log in to unmask] <[log in to unmask]>
Subject: [TN] Class 0 ESDS board assembly transport...

Hi All,

Hope you all are having (or have had) a good weekend. I’m recovering from sort of bug that laid me low on Friday.

So today, I’m just taking it easy and have been searching around for the best solution to a project that we have, and that is trying to come up with a good way to move our board assemblies around on the production floor.

What makes this project a bit more complicated than what I’ve faced before, is that we need to be able to accommodate 17” X 22” boards (which we build a fair amount of), and we need to be thinking about Class 0 (100V) ESDS devices. Yep, they’re here now, and ya’ll will be seeing them in the future before too long. Here’s one that we’re starting to see now:

http://components.omron.com/components/web/PDFLIB.nsf/0/8B06D373BFF754C6862574FE007B0E26/$file/2SMES-01_1210.pdf

So, my first thought was Bliss tray carts. I’ve bought them in in the past at the other companies that I’ve worked at. In fact, Bliss has one of my old Technet postings on their web page recommending them. But I never had to deal with 17” X 22” boards and Class 0 ESDS devices before.

I thought that their 18” X 26” enclosed cart would work, but the boards won’t fit in their trays. The actual tray width at bottom inside dimension is only 16.5 inches. So I have to go up to their next cart size, which is 20” X 26”, but they don’t offer the enclosed option like they do with the 18” X 26” cart. They will do custom stuff, but I’m sure that is going to add big $$$ to the cost.

So I have a multipart question ; if the cart is on conductive casters and rolling on a static dissipative floor, has good drag chains, the boards are on ESD trays, and assuming the person moving the cart is well grounded, does enclosing the carts offer significantly more protection? I know that having the board completely enclosed inside a faraday cage is ideal, but how can you practically accomplish that? Especially with boards as large as 17” X 22”?

I’ve even been looking at basic, enclosed stainless steel food delivery tray carts thinking that might be a solution, but had a cow at what they cost! I was looking for something that would handle anywhere from 10-20 trays, that I could put a 20” X 27” tray in, and they can go for anywhere from $2000 on up! That’s without the trays too...

After spending a good part of the afternoon looking for carts, ESD trays, and especially after reading this article:

http://circuitsassembly.com/cms/magazine/95/6351

I’m realizing what a task this is. It’s not just about the carts, but it is much, much more than that. 

But for now though, I just need to figure out a good way to move our product on the production floor. I’m curious about how you all have addressed this.

I think I’m going to watch the NASCAR race now...

Steve

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