Where I worked before, the wave solder machine had an inline cutter that
worked with the machine.
Solder, inline cut (Circular saw on its side basically), resolder, out the
other end. No manual cutting allowed.
Jan Pelchat
Benchmark Electronics
> -----Original Message-----
> From: Dorothy M. Lush [SMTP:[log in to unmask]]
> Sent: Thursday, July 12, 2001 7:32 PM
> To: [log in to unmask]
> Subject: Re: [TN] Lead protrusion
>
> Peter,
> Bill is right about the need to avoid trimming leads after solderwave. The
> thicker the lead and/or cheaper the cutter the more likely there will be a
> cracked solder joint. IPC class-2 says that this cracked solder joint does
> not need to be remelted and class-3 says it does. Class-2 recommends
> 60-100
> mils lead length unless otherwise specified by the customer. If you are
> building to Class-2 and you don't want a possible lab or field failure
> because of a cracked solder joint then think and plan ahead to avoid
> having
> to trim. The thinking and planning includes the final assembly the PCA
> will
> be in. For instance, clearance for slot cards to slid in and out.
> Connector
> leads under a front panel even with an insulation strip can cut through
> the
> insulation eventually fail. I had a customer who wanted me to trim 70 mil
> plus diameter pins to 30 mils on the off the shelf power supply instead of
> ordering the right length leads. They would have to be machined to do that
> which can lead to other defects.
> Dorothy Lush
>
> > ----------
> > From: Kasprzak, Bill (sys) USX[SMTP:[log in to unmask]]
> > Reply To: TechNet E-Mail Forum.;Kasprzak, Bill (sys) USX
> > Sent: Thursday, July 12, 2001 12:58 PM
> > To: [log in to unmask]
> > Subject: Re: Lead protrusion
> >
> > Peter:
> >
> > Personally, I like .090", but typically I have to hold between .040 and
> > .060. In my mind, I think you would like to install parts with the
> correct
> > lead length prior to wavesoldering. Avoid having to trim after soldering
> > is
> > always a good idea.
> >
> > Bill Kasprzak
> > Moog Inc., Electronic Assembly Engineering
> >
> >
> > > -----Original Message-----
> > > From: PL [SMTP:[log in to unmask]]
> > > Sent: Thursday, July 12, 2001 2:26 AM
> > > To: [log in to unmask]
> > > Subject: [TN] Lead protrusion
> > >
> > > Hello,
> > >
> > > Does anyone know what is the standard used for prepping
> > > the leads for through-hole boards?
> > >
> > > What are the critical parameters one should consider
> > > when determining the amount of trimming on the leads?
> > >
> > > Rgds,
> > > Peter
> > >
> > >
> > > _________________________________________________________
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> > >
> >
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