Numerical control is defined as a form of programmable automation in which the process is controlled by numbers, letters, and symbols, introduces K. Thamizharasan in ‘CNC Programming & Operation.’ He delineates the basic components of numerical control system as program instructions, controller unit, and machine tool.
In a chapter on ‘part programming,’ the author takes one through the different types of NC words, such as the N-words, as in the case of sequence numbers. “The program is executed from the lowest block number to the highest. It is customary to start with block N0005 or N0010 and proceed in steps of 5 or 10…” Among the other types or words are the G-word (preparatory function); X, Y, and Z words (coordinates); F-word (feed function); S-word (spindle speed function); T-word (tool selection function); and M-word (miscellaneous).
It should be of interest to know that the author, who started off as an apprentice in Ashok Leyland, is currently a Worker Education Teacher in the company, and has trained about 3,000 employees in CNC operations.
“Our design software is so creative that...”
“It creates modern art?”
“No, it writes up the accounts just the way we want, along with all the supporting vouchers!”