I am trying to rout some half blind dovetails and am having problems routin
g the pins.
Drawer sides (tails) are poplar. 1/2 inch thick. Drawer face is hard maple
(pins) 3/4 inch thick. Bit depth is 7/16 inch.
I have 3 problems.
No matter how hard I clamp down on the pin board (top clamp). the torque fr
om the router bit cutting through the end grain causes the board to rotate
slightly screwing up the pin alignment. The pin board is about 8 inches wi
de but I have a board of equal thickness clamped at the other end of the j
ig to ensure even and correct clamp pressure. Light passes make no differen
If I am lucky enough to get a cut that does not rotate while cutting the p
ins,I see a second issue where the depth of the cut pin (from the side of t
he board into the board not the actual bit depth) is LESS on the right side
than on the left. I hope I am making sense here. I do not mean the router
bit depth but the depth one routs the pins into the pin board so the tail b
oard fits flush.
The pin boards are confirmed flat and the corners are at 90 degrees. Confir
med with a engineer grade straight edge and square. The guide settings are
for the tail board thickness (1/2 inch)
Finally, even if I can get past these 2 issues there is a fitting problem w
ith the joints. At the left end of the joint the fit is good but at the rig
ht end of the joint there is a 1/32 inch gap between the pin and tail board
The "left end of the joint“ is the side of the pin board that butts agai
nst the end of the jig on the left side as one faces it.
I have destroyed some really nice wood and wasted days trying to figure out
the cause. My frustration is at a point where I am coming to believe the p
urchase of this jig was an expensive mistake.
If anyone has any ideas as to what could be causing these problems I would
greatly appreciate any insight.