Quite often, there is no need for it to be exactly centered. As long as you
mark off the front face for both the mortises and tenons, the two pieces should
come together with the front faces aligned.
remove the key to email me.
As the other posters said, you don't often "need" to be centered. There is
a simple way to be pretty darn close, though, depending on the dimensions of
your stock. If you're mortising a 1" thick piece to accept a 1/2" tenon,
for example, set your mortise gauge with a 1/4" chisel. I try to use my
chisels for this purpose whenever possible, and it get's me pretty much dead
on most of the time.
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