In FIG 8, {HEAD ~ function F} represents {TAIL ~ the ideal shape} of the surface to be machined, f represents the desired position generated by function generator 142 and Y represents the actual position of cutting tool 100 
represents
In FIG 8 , { HEAD ~ function F } represents { TAIL ~ the ideal shape } of the surface to be machined , f represents the desired position generated by function generator 142 and Y represents the actual position of cutting tool 100
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH