GB590408A - An improved cutter head for use on boring machines - Google Patents

Abstract

590,408. Boring heads and machines. MALIA, A. April 20, 1945, No. 9978. [Class 83 (iii)] In a cutter head for engine cylinder boring machines wherein the boring tool is adjustably mounted in a diametral groove in the head, the tool is adjustable in a detachable holder which is positively held against radial movement in the head by axially located constraining means. The head 5, Figs. 1 and 2, is connected to a hollow bar 4 rotated by a gear 4a and is mounted in a casing 2 which is fed vertically inside a support 1 by means operated by a handle 3. A spindle 6 inside the bar 4 has a key 6a engaging a slot 4c in the bar and is axially adjustable by a knurled nut 7. The spindle 6 has a conical part 8 for radial adjustment of guide fingers 9 against a spring band 9a for location of the head in the bore to be cut and a lower projection 8a extending into the diametral groove 5a for the tool holder 11. When the spindle 6 is in the lowest position, the fingers 9 are withdrawn. A stop 5b ensures that the tool holder is inserted from one end only of the groove 5a and the holder has a recess 11e, Fig. 6, to clear this stop. The setting gauge comprises a base 17, Fig. 6, having a projection 19, which corresponds to the projection 8a and engages a recess 11b in the holder, and a bracket 17a supporting a micrometer 18. A saddle 20 sliding in a slot in the base carries a stop 20a to register the tool in the vertical plane of the projection 19 and of the micrometer. After the tool 12 has been set in the holder by means of the gauge and secured by a screw 14, the holder is transferred to the head where it is located in a slightly retracted position by a spring ball detent 15. The spindle 6 is then lowered so that the projection 8a engages the recess 11b and moves the holder to the correct cutting position corresponding to that to which it was set in the gauge.