note and ad-vice on a vice
I do all my joinery with a knife and vice but the accuracy, squareness and flat surfaces depend on the quality of the vice.
here you see both jaws on the vice are machined surfaces and they line up with each other, if one jaw was slightly lower or higher the cut will be at an angle.
you get want yo pay for
the vice at the top bolts to a X Y table on a mill or drill press and works fine for that. It also has replaceable jaw plates or soft plated for delicate clamping
this jaw is 3 inch and does have a little wiggle not a big deal for a 3 inch jaw you just have to clamp in the center
this vice is a closeup of the black one, you can get these for around 6 to 10 bucks and are good for holding stuff but worthless for cutting accurate joinery because the tops of the jaws have to much play and don't line up with each other.
this is the vice used for accurate joinery cutting because the jaws are machined flat and square and almost zero wiggle in the moveable jaw
when you close the jaws you can see the top surfaces match and the jaws close tight
this is a good little vice nice and accurate its only problem is the jaws are not machines smooth.
so there you have it if you want nice fitting joinery get a nice fitting vice