Lew Hodgett wrote:
The3rd Earl Of Derby wrote:

No offence like.

I've had a think and all it takes is a bit of wood with increments
of half
inch steps at one end, increments of 1/8th steps in the middle and
1/16th
steps at the other end, marked on the wood.
Position the wood against the fence and move the fence near to the
router
bit in question and adjust the height.

And then comes the test cut, usually on a piece of scrap.

Lew

True,but if the increments are a fine line and are accurate in spacing,only
one test cut is needed to verify its accuracy without having to have it
niggling the head in future cutting. :-)

--
Sir Benjamin Middlethwaite