Grounding works great. However, cart drag chains are problematic. It might
be more effective to purchase conductive casters.
A cart cover having shielding properties would not be necessary if all
conductors are effectively grounded, and all insulators are removed from the
ESD protected area.
Gene Felder
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard D. Krug
Sent: 2011 - 04 - 12 10:10 AM
To: [log in to unmask]
Subject: Re: [TN] Class 0 ESDS board assembly transport...
I don't know how much additional protection the cover provides. Perhaps an
ESD blanket to cover CCA's on dissipative trays could provide cost effective
protection if you don't have large numbers of these large CCA's.
Dick Krug, CSMTPE
SMT Process Engineer
Sparton Corporation
30167 Power Line Road
Brooksville, FL 34602-8299
p (352) 540-4012 (Internal Ext. 2012)
[log in to unmask]
-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Tuesday, April 12, 2011 12:27 PM
To: 'TechNet E-Mail Forum'; Richard D. Krug
Subject: RE: [TN] Class 0 ESDS board assembly transport...
Hi Dick,
Yeah, I think I saw those for Metro tray carts:
http://www.metro-wire.com/index.cfm?mf=browse.showPart&partClassID=5363&PNam
e=SmartTray%20ESD%20Cart%20Covers
The carts that I was considering earlier were 18" X 26" Bliss tray carts,
and they only have 5-sides too. But I found out that the 18" X 26" tray
isn't big enough for the largest boards we build here.
http://catalog.blissindustries.com/cgi-bin/Panorama.cgi?CATALOG~.catpart~976
0-300-11
Bliss says they will do a custom cover, but I haven't got a quote back from
them yet (everybody is at APEX).
The covered cart option is pretty expensive, and I'm wondering how much
extra protection (if any) that really buys you.
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard D. Krug
Sent: Tuesday, April 12, 2011 12:03 PM
To: [log in to unmask]
Subject: Re: [TN] Class 0 ESDS board assembly transport...
In my past we had used some ESD cloth covers over racks with CCA's. CCA's
were not Class 0. Covers were over 5 sides, but I think the bottom was
open.
Dick Krug, CSMTPE
SMT Process Engineer
Sparton Corporation
30167 Power Line Road
Brooksville, FL 34602-8299
p (352) 540-4012 (Internal Ext. 2012)
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, April 12, 2011 11:56 AM
To: [log in to unmask]
Subject: Re: [TN] Class 0 ESDS board assembly transport...
I know a lot are off to APEX, but do any of you have any opinion of tray
carts moving product on the production floor? Specifically in a low ESD
sensitive environment?
Do covered carts offer any more protection than a open cart if it is well
grounded and the product is on static dissipative trays?
Just trying to understand if I need to spend the extra money on a covered
cart or not.
Thanks,
Steve
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