Using the spacers is nice, but we found that it increased our assembly time
too much.  What we have done is either kink the leads or find a body
size/lead configuration that kept the meniscus out of the hole and all parts
at a uniform height.  Another thing we did was to standardize our lead
spacing as much as possible so when Engineering changed a component value we
did not have to re-spin the bare board for a lead spacing issue.

Just one engineer's opinion.

Phil

-----Original Message-----
From: Kasprzak, Bill (sys) USX [mailto:[log in to unmask]]
Sent: Thursday, June 21, 2001 7:37 AM
To: [log in to unmask]
Subject: Re: [TN] Spacers


Lou,

We use spacers all the time for our radial leaded parts. There is a
commericial specification (used to be a military one) numbered A-55485
available from any of the websites that offer copies of government specs
-(http://astimage.daps.dla.mil) is the one that I use. This spec is a
complete catalog of spacers and suppliers. The spacers that I use are nice
because they support my parts off the board without affecting topside solder
fillets. I like this better than the "kick" in the lead method as the the
"kick" method seems to elevate the parts higher than I like to see. I also
like the spacers better than the toothpick and wire support methods.

Bill Kasprzak
Moog Inc., Electronic Assembly Engineering


> -----Original Message-----
> From: Lou Hart [SMTP:[log in to unmask]]
> Sent: Wednesday, June 20, 2001 6:21 PM
> To:   [log in to unmask]
> Subject:      [TN] Spacers
>
> TechNetters, our manufacturing people have asked me if it is OK to use
> spacers to assure proper height of radial leaded components.  They have
> been using short wire segments as temporary standoffs, which are removed
> after wave solder.  The spacers would stay in place, so the customer would
> see them.  I've contacted the customer's engineering for guidance, but
> wanted to get TechNet input about the removable wires vs. leave-in-place
> spacers.  Thanks for any comments.  Lou Hart
>
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