each cam arm 46 has an adjustable jaw 48 the adjustable jaws 48 allow the chuck 12 to be used with different sized workpieces however the jaws have a limited range of adjustment therefore when a workpiece is too large or too small to fit into the chuck 12 the cam arms 46 are replaced with ones that will accommodate the workpiece this changeover results in downtime at the machining facility so it is important that it be performed as quickly as possible the slot 44 reduces the cam arm changeover time by allowing the cam arms 46 to be replaced when only one of the two corresponding gussets 10 is removed each cam arm 46 is held in a yoke 50 two of which are visible in fig2 a pin 52 holds each cam arm 46 in each yoke 50 the gussets 10 on either side of the corresponding yoke 50 hold the pins 52 in place during machining when it is necessary to change the cam arms 46 the operator merely removes one of the two corresponding gussets 10 accesses the pin 52 through the slot 44 and drives the pin 52 u2014 e g with a pin punch or screwdriver u2014 toward the side where the gusset 10 was removed a second pin 54 holding the cam arm 46 to the face plate 34 is then removed and the cam arm 46 replaced without the slot 44.