Thread: set up for glue joint bits

there was a tip/method in a recent (i.e. last 12 months?) issue of Fine woodworking or Popular woodworking that involves using a vernier to set the bit height -- based, IIRC, on setting the midpoint of the bit to match the mid-point of the timber

There is a piece is the latest Carbatec Catalogue (Feb 2012) detailing the set-up. Probably on their website as well

from Carba-tec's web site

By accurately centring the bit to the wood, the upper and lower vertical cutting edges of the bit will cut equal proportions.

To accurately centre the wood to the bit, first adjust the bit according to the thickness of the wood you are cutting. Second, line up the cut edge of the wood [to] the centre point of the bit. The upper and lower vertical cutting edges of the bit are in proportion and at equal distance to the centre point of the bit. Then run one edge of the panel, turn the piece over and run the other edge for exact reverse cuts that match up perfectly. Assemble the reverse cut pairs...

When you get it right, keep a sample piece and use it next time as your template to set up from.

You will need one for each thickness you use, mark it as template when you put it away.