Hello Neale I think that is my answer or solution for the short to medium term as I tried all the positions on the ratchet locking and it varies about .3 degrees so that stops me from allowing for a fixed error,
is there a way to reset that coordinate within the g code program?
i.e.
G0G90A-90.
(reset DRO)
machining
A-90.
(reset DRO)
machining

that will essentially be indexing incrementally but as long as I remember that it will be fine,
chris w.