On 08/07/2012 08:42 AM, ceen...@in-front.com wrote: > The majority of boards I run are double sided so all SMT processes are > performed twice. This is one of the reasons I would like a paste printer > because the manual stencil printer requires a lot of adjusting and fixturing > changes when I go from side 1 (flat, no parts) to side 2 with lumpy parts on > the back side. It would be better if I actually made fixtures for each type > of board but where does the time go. Sound like you need a plate with a grid of threaded holes, and a bunch of (for the lack of a better descriptive term) standoffs. All standoffs would have the bottom threaded to screw into the plate, but with a flat at the edge of the threads for an accurate surface reference. There would be a length (I suspect about 1/2 to 3/4 inch would be about right) of shaft before the flat at the top for reference to the bottom of the board. Some would then extend in a pin shape that fits through your board and your stencil. You could set up the two corners for reference. You could set up four or more without pins that would contact the board at a place where no components would be when you flip the board. They would establish the Z level of the board for both screening operations.
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