Normally, when moving an ACR3 tool changer back and forth along the length of the rack, it is performed with the autojoint fully inserted into the docked position of a given slot. However, if you use an empty PEM type extension in one or more slots, it may need to perform the movement along the length with the autojoint less than fully inserted into the slot so that the key in the back of the slot is not engaged into the autojoint.
This registry entry defines how far short of the fully inserted position the autojoint will be placed for these movements.
Entry Name: ToolChangerACR3KeyClearance
Entry Type: Real number in mm that indicates the clearance distance. The default value is 5.0.