Vickers one-lock adjustable reamer with box spanner and key

Vickers one-lock adjustable Reamer with box spanner and key

This is a form of adjustable reamer patented by W. J. Smith in 1910; it is intended for both roughing and finishing cuts, the blades being either of high-speed or of carbon steel.

The reamer consists of a mild steel shell slotted and recessed to receive six blades which fit on a hardened steel conical bolt housed within the shell. The outside of the shell is fluted between the blades, which are well backed up while having their cutting edges clear. The middle portion of the coned bolt is turned parallel, screwed and fitted with a nut that is prevented from turning. The lower and larger end of the cone can be rotated by a key, this action causing the cone to travel endwise, thus pushing the blades radially outwards and increasing the diameter of the reamer. The end of the cone is graduated in divisions, each of which represents a variation in diameter of 0.00025 in. The maximum diameter is Ikin. The blades are cut away to clear the internal nut and they are locked by being gripped between this nut and the shell by means of another nut threaded on the small end of the bolt. The top of the shell is recessed to receive the key of the arbor on which it is mounted. The blades can be re-ground by placing the reamer in a grinding machine.