In a message dated 11/27/2001 2:35:13 AM US Eastern Standard Time,
[log in to unmask] writes:

<< As a result the jigs get very hot after
 soldering and takes long time to cool down to be feed back to the cycle.
 It also affects my profiling, throughput, and seems to create more dross
 than usual. >>

I have seen all of the effects you describe.  I believe the dross increase is
due to a small amount of moisture absorption by the pallet material, but I
have never taken the steps to prove it out.  The pallet will definitely make
a large difference in your profile.  As for cooling, I think the idea already
suggested of a rack with fans will work best.  You can also get conveyors or
buffers with built in fans, and even programmable to hold each pallet for a
set amount of time.  Then you can profile the cool down time with your KIC or
whatever profiler, and get  a good estimate for exactly how long to cool each
one before reusing.  I don't recommend any kind of quenching or other forced
cooling with liquid.

Jon Moore

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