Drilling Holes on a Large Bolt Circle
Special machine tool creates circle of holes spaced and bored to accuracy of few thousandths of an inch.
Hibdon, R. A.↗
Engineering topics
Hibdon, R. A.
Publications and source records attributed to Hibdon, R. A..
Low-cost boring mill
Portable unit and special fixture serve as boring mill. Machine, fabricated primarily from scrap metal, was designed and set up in about 12 working days. It has reduced setup and boring time by 66 percent as compared with existing boring miles, thereby making latter available for other jobs. Unit can be operated by one man.
Hibdon, R. A.↗