Hello paul...
Setting up to make router-cut dovetails is always a trial-and-error effort. You may need to fiddle around and readjust trial pieces to get a perfect fit. See below for pointers on how to fix possible problems. Most other problems are usually caused by the pieces not being clamped down in the jig so they're flush across the top, or because they move out of position as they're being routed.
TOO LOOSE: If joint is too loose, increase bit depth. TOO TIGHT: If joint is too tight, decrease depth.
TOO DEEP: If pins go deep, move template toward you. TOO SHALLOW: If not deep enough, move toward jig.
OFFSET: If pieces don't align at top or bottom, they may not have been tight against the stops.
When the joints are too tight decrease the depth just a wee bit. As you know, adjusting the jig always requires some trial and error. Good luck with it.
Joe - a fellow wood worker
Setting up to make router-cut dovetails is always a trial-and-error effort. You may need to fiddle around and readjust trial pieces to get a perfect fit. See below for pointers on how to fix possible problems. Most other problems are usually caused by the pieces not being clamped down in the jig so they're flush across the top, or because they move out of position as they're being routed.
TOO LOOSE: If joint is too loose, increase bit depth. TOO TIGHT: If joint is too tight, decrease depth.
TOO DEEP: If pins go deep, move template toward you. TOO SHALLOW: If not deep enough, move toward jig.
OFFSET: If pieces don't align at top or bottom, they may not have been tight against the stops.