an operational cutting position router 18 rotates cutter bit 42 around a substantially vertical axis during operation with reference to fig2 carriage assembly includes first and second clamping members 44 and 46 which are connected to one another via a pair of spaced threaded rods 48 on which are threadably mounted a respective pair of threaded handles 50 for tightening and loosening clamping members 44 and 46 about router 18 referring to fig3 a ring member 52 is removably mounted on table plate 20 and defines a central through opening 54 through which router bit 42 extends upwardly of table plate 20 ring member 52 may be replaced by an alternate ring member to accommodate different sized cutter bits 42 in addition ring member 52 is removable in order to allow router 18 to move upwardly to a position which allows cutter bit 42 to be removed and replaced at a position above table plate 20 the rapid vertical adjustment provided by lift handle 12 greatly expedites the ability to remove and replace cutter bits fig3 also shows a pair of mounting screws 56 for mounting guide posts 32 and 34 on table plate 20 a cap member 58 is rotatably mounted on table plate 20 and defines a central hexagonal recess 60 adapted to matingly engage a portion of handle 14 for rotation of cap member 60 and adjustment screw 30 table plate 20 also defines a through opening 62 which is disposed between and aligned with opening 42 and recess 60 of cap member 58 a portion.