"GerryG" wrote in message
...
Or,...buy/setup a router in the table such that you can precisely set it
to
any given height. Consider, once the Incra is zero'ed, you can always
return
the fence to any given distance. If you're going for the Incra's
advantage,
why not go for the same with the router? My box of dovetail bits has a
height
by each bit. I zero the router, then just dial in the height.

Alternatively, I'd use a height guide (as in the board he mentions below)
and
raise the bit until a flat piece of wood swept across the top just scrapes
the
bit without catching. I suggest this is more precise than trying to
visually
match a profile.
GerryG

Actually when the bit is clocked so that the bit is at its widest when you
slide it into the profile, if it is not the right height, either too high or
too shallow it simply will not go into the profile. This is not a new
method, it is practiced for set up for raised panel bits to match stile bit
cuts and for matching rail and stile cuts to each other. Not having to zero
to start with saves a bit of time. With that said, I use a Bosch 1716 evs
for cutting DT,s because it is simple to adjust in very small increments but
I have never entertained the idea of zeroing the bit first.