Hu -
Thanks for the reply, a very good logical one I might add. I like the idea of setting up the machine from known logical coordinates and the reference tool - I am just not sure how to get there from where I am at with this machine. Did some checking of how the machine is set currently. The G53 X zero appears to be where the spindle center and center of the boring tool pockets are in line. The G53 Z zero is the face of the chuck. The confusing thing is where the machine is setup for G28. This is the same as the G53. If I am understanding you correctly, the G28 is both a reference point and also the tool change position. So based on that I have no idea why the previous owner had this setup where G53 and 28 are the same.
Looking forward, I guess I need to figure out what parameter(s) the G28 settings are in and change these. The X position would be somewhere a 1/2" or so from the axis home (full back) and the Z position would be back (Z +) an amount I determine to be a safe distance, taking into consideration what my longest part will be from chuck face + my longest tool. Getting the G28 to correspond to the reference tool is a bit confusing still. If I keep adjusting the parameter for G28 to make the Z display read zero when tool 1 is touched to chuck face, and if I cut a piece of stock right to 1.0" dia. then the X display should read .5" - doesn't this change where my G28 reference position actually is?? I guess I really like the concept you have outlined and are helping me get to, I'm just fully understanding it yet. Thanks for the help thus far!  |