Thomas McGahee wrote:
>This can help minimize warping in large boards.

Sorry, what=B4s warping?

...

BTW, Years ago I used a device with bubbles and I think it did etch at an=
 overall even rate.

But the bubbles make lot of very small drops of etchant fly away, so it is=
 no good idea to etch in the lab...

Been thinking about using a small dc motor to make a vibrator that vibrates=
 the board in small circular pattern.

Regards
/Morgan

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