Quote Originally Posted by maxspongebob View Post
Would this simplify the process. It plugs directly into the stock spindle controller and gives you a run/stop, direction, and speed 0-10v signal inputs.
I am using one on my lathe, works great.
Does the device you suggest return the actual tacho speed to the CNC system (Mach or linuxCNC) , and does it guarantee tacho speed to be the G-code specified speed?

What I am working on (open source) does these, and will simply replace the pot-board on the mill, using standard cables in the mill. In addition, an LCD tacho display can be tached [bad pun intended] onto the mill (special cable required);.