If there is a conventional machine which is required to be updated, automated as per work needs, retrofitting operation is an interesting alternative to the purchase of new machinery, since excellent results may be achieved in many cases with less investment. similarly by retrofitting of radial drilling machine its functionality can be improved. radial drilling machine is used extensively to drill holes in jobs from smaller size to bigger size as spindle of drilling machine can be moved radially, radial arm on which carriage is mounted can be rotated through 360°. so without moving the job holes can be drilled easily. by retrofitting project cycle time for drilling holes can be reduced and accuracy can be increased. the most time consuming process of marking of holes before drilling is eliminated by retrofitting as all the co-ordinates of all the points will be calculated by microcontroller as per the provided information. here in this project calculation for flange is completed and the way how radial drilling machine will work after retrofitting is shown. using retrofitted machine work piece of wide range can be machined without much time consumed hence there will be increase in productivity and better accuracy.