Join Date: Sep 2012
Location: Wilkes-Barre, PA
A Jr jack is just a jack plane with a more narrow sole & cutting iron.
Block planes are good for general work - chamfers, localized smoothing of small areas, stuff like that.
A jack plane is so named as it alludes to the "jack of all trades". It's best suited for initial flattening of rough stock, though it can be used for edge jointing of smaller pieces and will work as a smoother in a pinch with the right setup.
A smooth plane (no 2, 3, 4, 4 1/2) is meant for final smoothing after the stock is planed flat.
A jointer plane (no 7 or 8) is used in flattening board faces and jointing edges to be straight and square.
To really be set up completely, you'd need a smoother, jack, and a jointer. And a low angle block plane is good to have too ;-)
Last edited by BZawat; 02-03-2015 at 01:18 PM.