Re: Mortise and Tendon Joints
the first thing you need to check is that the two pieces you are joining are the exact same thickness and width, from there that they are both flat and true.. from there its just a matter of making precise layouts and setting your tools properly.
if the peice with the tenon is slightly thicker than the piece with the mortise, there is a chance that the tool setup wont product the correct size tenon,
as for cutting hte tenon slightly smaller, the only way you should do this is in the lenght, allowing a smal space in the mortise where glue can go and it ensures the shoulder of the tenon will be tight to the joining peice of would
hope this makes sense
fire up the saw and make some dust