Join Date: Jan 2009
Location: Sioux Falls, SD
The reason is the fence. On a table saw the work piece is between the blade and the fence. Irregularities can cause it to bind and kickback and you won't necessarily get a straight edge as the fence is straight and not offset. On the router the bit (should be) enclosed in the fence with only what you need showing. By adding the offset you are giving support to the new edge that is being proscessed by the bit. Several small passes will eat the irregularties from the board. You can make a jig for your table saw that is quite easy and effective. Just google table saw jointer jig and choose one you like. They are all pretty similar. I personally like the ones with the hold downs on them.