Kevin,

I don't have a solution but I wonder if you've discussed the problem
with the solder manufacturers? They should understand the metallurgy of
their product and hopefully be able to give you a solution.

Regards,



Kevin Glidden wrote:
> You could try buying some composite material (pallet and fixture materials)
> and having replacement fingers machined for you..expensive solution but it
> would work...
>
> Kevin Glidden
> Manufacturing Engineer
> Luminescent Systems Inc.
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Neil Maloney
> Sent: Thursday, August 03, 2006 5:05 PM
> To: [log in to unmask]
> Subject: [TN] SAC 305 solder on TI wave solder machine transport fingers
>
> Greetings Technet.
>
> I have an interesting problem that has developed since we converted to our
> lead-free process.  We have been using an Electrovert Astrapak for our wave
> solder operation for many years in our SnPb process.  A few months ago, we
> converted the machine for SAC305 by installing new titanium parts
> (solderpot, pumps, wave guides, etc) and loaded it up with Alpha metals
> SAC305. We removed and cleaned up the transport fingers in alcohol while the
> pot conversion was under way.  After putting the machine back together our
> new lead-free process seemed perfect -- except that now the SAC305 is
> sticking to the titanium transport fingers- I mean really sticking to them.
> The smooth wave doesn't seem to affect the fingers as much as the chip wave-
> but after a run of about 200 PCBs- the fingers are fouled with solder - to
> the point that we have to stop and brush out the fingers with a rotary wire
> brush.
>
>
> We never had this problem with leaded solder. We do not have an automatic
> finger-cleaner installed on the machine (we never had this problem before)
> and I cannot find one anywhere to retrofit.  But the question still comes
> down to-- what is causing the solder to stick where it did not stick before?
>
>
> We use a no -clean flux (Alpha EF2202 or Indium 1075, makes no difference
> --the solder still sticks.) The fingers were not changed out (only soaked
> and cleaned with alcohol) when the rest of the machine was converted to
> lead-free.
>
> Any insight into solving the problem would be greatly appreciated.
>
> Neil Maloney, Manufacturing Engineer
> Contemporary Control Systems, inc
> 2431 Curtiss St Downers Grove, IL  60515
> (630) 963-7070 x132
> [log in to unmask]
> http://www.ccontrols.com <http://www.ccontrols.com/> http://www.ctrlink.com
> <http://www.ctrlink.com/>
>
>
>
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