Steve -
Virtually all placement machines that I am aware of are able to place your
R's and C's at a 20 degree angle. Assuming the assembly house is using
reflow soldering, then the only areas of significant concern are stencil
printing of the solder paste, solder paste inspection (if it is automated),
and board inspection after assembly.
If your assembly house is using wave soldering for chip components, than
that is an entirely different issue, and the chip components would be much
more difficult and expensive to solder. Additionally, the layout of the
other components on the board would have a major impact.
My suggestion is that whomever the project leader is needs to contact your
assembly house so they can review your proposed layout. I think you have an
uphill battle unless there are significant overriding technical issues.
Normally, R's and C's, as well as all components are mounted at 90 degree
angles. This makes manufacturing's assembly processes much more straight
forward, and the costs are much less than developing unique processes and
fixture designs to accommodate your unique layout.
Ed Valentine
Electronics Manufacturing Solutions
8612 Mourning Dove Road, Raleigh, NC 27615
Phone: (919) 270-5145, Fax: (919) 847-9971
Email: [log in to unmask]
Website: http://www.ems-consulting.com
----- Original Message -----
From: "Thomas, Stephen" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, February 07, 2001 6:55 AM
Subject: [DC] SMD passives placement angle.
> As I can't easily talk to my assembly house, can anyone help with the
> following questions please.
>
> I have a design on which it would be desirable to place a array of passive
> components (0603 Rs and Cs) at a 20 degree angle to the horizontal. The
> questions are will this cause problems on the assembly machine ? or are
all
> SMD assembly machines capable of all angle placement these days ? If all
> angle placement is common place what is the most common angular increment.
>
> Thanks for your help.
>
> Steve
>
> =========================================================
> Scientific Generics Ltd Tel: +44 (0) 1223 875 200
> Harston Mill Fax: +44 (0) 1223 875 201
> Harston http://www.generics.co.uk
> Cambridge
> CB2 5GG UK
> Registered in England No 2081960
> =========================================================
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