So, the process parameters were made to change for achieving
the process within the control limits. Some parameters were
changed as follows:
· First, the structure of the workpiece material was
examined. It was noticed that, the castings were taken
out of the furnace before the predetermined time.
· To prevent the ovality, the center line of the chuck and
tail stock of the CNC machine was readjusted.
· The speed, feed rates and the cutting depth of the
machining parameters were examined and adjusted.
As a result of these changes, made onto the machine, the parts
were manufactured within the tolerance limits and ovality and
surface roughness problems were eliminated.