Originally Posted by
localele
They are to set the extent of travel for the table.One for the way up and one for the way down.
Same things for the rear table.Obviously you need to set the rear table to the cutter head circle for the way up.
They could also be set to limit the maximum amount of timber able to be jointed at one pass.Say 5 or 6mm limit on depth rather than the 20mm the depth of cut gauge shows.
It does mean though that you can also set the rear table down to be able to plane in between two points as in the bottom of a table sled foot.Then hopefully be able to return to the zero point again.