I know that there is/was a company out there that offered a 90 deg. bend
finger that fit in place of the 45 deg. bend finger, and the portion
that went under the board was Teflon-coated to prevent solder from
sticking/transferring. However I cannot recall who they were. That may
fix your problem of solder retention on the fingers.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Neil Maloney
Sent: Friday, August 04, 2006 10:08 AM
To: [log in to unmask]
Subject: Re: [TN] SAC 305 solder on TI wave solder machine transport
fingers
Our Alphametals guy says that they (Alpha)have never seen this before.
Nobody else in the solder business (machine or material) has an answer
for us either. I guess that I will buy a few new fingers and see if
they grab solder off the wave.
-----Original Message-----
From: Eric CHRISTISON [mailto:[log in to unmask]]
Sent: Friday, August 04, 2006 8:12 AM
To: [log in to unmask]
Subject: Re: [TN] SAC 305 solder on TI wave solder machine transport
fingers
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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