rs of this description, for use in bores Shell reamers, such as shown in Fig. 129, are excellent The common form of the smaller sizes of boring bar is of a large diameter, are made with a head of increased di- tools for sizing purposes, that is, for taking a very light that shown in Fig. 181, A A… … ers having movable cutters, so that the size of the reamer setting the cutter quite true, a flat and slightly taper surface true from end to end, and having a keyway cut along its en- may be varied by a change of cutters, and economy in sharp- sould be filed on the bar at each end of the keyway,…
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