Q: How much growth (or shrink) should one expect land-to-land over a 16" distance? This has nothing to do with drilling; just master pattern to actual board size... A: I believe that's called stretch effect, the bigger the board gets the more severe the growth (or shrinkage) it will have. The stretch also depends on the board house and board thickness. The best way to minimize stretch effect is to group components which require tight tolorance into the central location of the PCB. Thanks Michael Yuen ---------- From: TechNet-request To: technet Subject: dimensional question Date: Tuesday, April 23, 1996 11:07AM The proliferation of sub .5mm peripheral leaded SMD's is causing assembly people to look at the overall size relationship between the master data and the actual board. When solder paste is stenciled on larger boards (say, 12-16"), the stencil image many times will not match the land pattern, causing shorts in the fine pitch area. My question: How much growth (or shrink) should one expect land-to-land over a 16" distance? This has nothing to do with drilling; just master pattern to actual board size... Thanks, marko