On 1/17/2018 3:46 PM, GarageWoodworks wrote:
BTW I am not sure why he made a cut out, it seems to serve no purpose.

The cut out reduces the amount of contact surface area, which has the potential to reduce error. Errors in the few thou of an inch are enough to influence fit.

-Brian


:~) So a cautionary modification.

Unfortunately these type jigs, and I have the BridgeCity KerfMaker,
don't allow for inconsistencies in thickness of the material that will
fit onto the dado. And plywood typically varies in thickness along any
given edge enough to be more than a few thou of an inch.

And really that is not a fault of the jigs so much as the quality of the
material that fits into the dado.