Eyeball accuracy

[gwilson]

I think you should clamp the indexer directly to the machine's table. you have 3 sources of error the way you have it clamped in the vise : Vise's accuracy,the parallel's accuracy, and the accuracy of the indexer's bottom surface.

[DaHui]

I like this thread! There seems to be an obsession with maximum accuracy at all times but isn't good enough "good enough?" If it needs to be eyeball close I say eyeball it! If it needs to be tenths close, use one of those Hermann-Schmidt finders.