while the rings arebeing turned. This is the usual form in which pistonring castings are sent to the machine shop and is the bestway for this particular job. If these lugs are not pro-vided, the machinist has to grip the casting in a chuck; MISCELLANEOUS EXAMPLES 141 this is liable to spring it, so… … FiG. 85. trated here—one being on the outside of the casting, theother on the inside. This casting is the column for asmall drill press. It is finished the whole of the distanceA, so it will have to be mounted in the lathe betweencenters. In order that this may be done, there will haveto be a boss…
Patternmaking
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