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Got it, thanks.  I'm OK with expense, if I do go with absolute encoders, is there a recommended path for a board + integration with LinuxCNC?

hi i have the new config file just need to know how to insert it to my bootable pen drive before i commit to updating the hard drive thanks

I have a hobby robot partly based on the Melfa sim.  When I home the robot all axis report zero degrees.  The Cartesian location appears correct and it jogs correctly in world/Cartesian. The problem is I'm getting axis limits that contradict what is reported at the Home position pictured below. 

With axis 2 limit set to -45/+110 I'm getting a error at -20 degrees.  It appears the axis limits are rotated 90 degress some how.  Is there an absolute vs. relative setting?  

 

I could fudge the limit settings but I want it done right.  How should I define the axis limits?

I haven't looked but I am fairly sure the the software supports mcode with decimal places ? M7.0 or m7.1  etc and so on. 

the current coolant/cutting fluid controls are way to limited and require to much special handling. It would make sense to update the current scheme with mcode that could be numbers 

M7.1 air blast
M7.2 mist
M7.3 flood
M7.4 through tool 

etc and so forth. I can modify the existing post processor but where exactly would this change have to be made in the core of the linuxcnc software base ? Also the existing mcodes for coolant can be left standing. I am just trying to avoid creating custom mcodes for controlling the various cooling systems I am adding to my machines, but many NEWER cnc machines also have many varying types of coolant schemes.