Graham,
A number of comments are relevant here.
1. Still using Titanium wave fixtures? They are Clunky, Heavy, suck up the
heat! Their only redeeming feature is that solder doesn't stick! Try using
a composite material such as Durostone.
2. As for using Aluminium or Aluminum (depending where you live!), If it
has been anodized, then the surface becomes non-conductive. Even if it has
not been anodized, the surface oxidizes naturally in air, and guess what,
it becomes non-conductive to a lesser or greater degree. I suggest you
respectfully ask your CEM to test the racks, if you are concerned about it.
Happy Politically Correct time of the year!
Chris Chapman
Datum Dynamics USA
http:/www.datumdynamics.com
-----Original Message-----
From: Collins, Graham [SMTP:[log in to unmask]]
Sent: Wednesday, December 16, 1998 7:00 AM
To: [log in to unmask]
Subject: Re: [TN] aluminium PCB transportation trays
Ian
I hope you aren't counting on that snow, in defiance of normal weather
patterns we in eastern Canada have had only a dusting of snow, and in
Toronto it has been about 10 degrees C for days... Santa will have to put
the wheels on this year.
Re the trays, if I can use a titanium pallet for wave soldering, what can
be
wrong with an aluminium tray for movement (although we use plastic tote
bins
ourselves)?
I think a conductive plastic tray would be preferable as it is a bit softer
and marginally less likely to involve physical damage to boards, but
aluminium should be OK. With respect to ESD, the conductive properties are
different but in a properly ESD safe environment would it matter? Plastic
would be safer for the operator if the tray happened to come in contact
with
live wires, but how big an occurrence is that for you/them???
Have a Cool Yule!
Graham Collins
Process Engineer,
Litton Systems Canada, Atlantic Facility
(902) 873-2000 ext 6215
-----Original Message-----
From: Ian Squires [mailto:[log in to unmask]]
Sent: Wednesday, December 16, 1998 2:44 PM
To: [log in to unmask]
Subject: [TN] aliminium pcb transportation trays
Good morning all
My last post before xmas i hope (leaving rainy england and visiting
snowy Canada for the hols).
Enough about my vacation (first one all darn year).
The problem is this: we have a particular CEM who transport all
their PCB's on ALiminium trays, anywhere from one to 20 assemblies per
tray.
Is this good practice, What about ESD, Mechanical damage to components and
boards, any other.
Or is it perfectly acceptable as they are intimating?
Happy Xmas to all
Ian Squires
Regards
Ian Squires
Senior Production Engineer
-------------------------------------------------------
Graseby Dynamics Ltd
A Smiths Industries Company
Park Avenue, Bushey, Watford, Herts, WD2 2BW
Web Site: www.gradyn.co.uk
Phone: 01923-228566 xt 295
Fax: 01923-221361
E-mail: [log in to unmask]
Registered in England no. 480992
Registered office:
765 Finchley Road, London, NW11 8DS
-------------------------------------------------------
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