. Canadian machinery and metalworking (January-June 1919). er C coincides withthis index line, and after the pointer hasbeen once accurately set the machiningof this counterbore to the correct depthis one of quick duplication. Two holes are then drilled as the nextoperation for oil holes, these being spot-ted in the centre of the bosses. The jig shown in Fig. 13 is then placedon the casting, being located by a plugat A and fitting over the turned boss atB. The jig is held with a screw C at theupper end. This tool is made of sheet steel and asthe plug is only of a relatively shortlength it can
. Canadian machinery and metalworking (January-June 1919). er C coincides withthis index line, and after the pointer hasbeen once accurately set the machiningof this counterbore to the correct depthis one of quick duplication. Two holes are then drilled as the nextoperation for oil holes, these being spot-ted in the centre of the bosses. The jig shown in Fig. 13 is then placedon the casting, being located by a plugat A and fitting over the turned boss atB. The jig is held with a screw C at theupper end. This tool is made of sheet steel and asthe plug is only of a relatively shortlength it can be sprung into positionwith the upper position fitting on theturned shoulder. Two holes are then drilled for 5-16in. x 18 thds. through the bushings C,these holes being used to attach the in-dex plates onto the tail stock. A slot 1-16 in. wide is then machinedfor stamping the tail stock on the divid-ing head. An oil groove is also machinedthrough the long hole, using a one pointcutter held in a bar and employing anarbor press to force the bar through the. FIG. 15—DRILLING INDEX PLATES. piece. A finish machined index bearingis illustrated in Fig. 14. Machining Index Plates The index plate fits on the outer endof the index bearing and is the mediumused for spacing the object being ma-chined into any number of desired divi-sions. The first operation when makingthem is to bore and face one side, hold-ing it in a chuck on the lathe. The index plate is then reversed, be-ing held on a face plate and the otherside faced parallel to the first, the op-eration being again performed in a lathe. They are next placed on an arbor, 20at once, being located by the bored holeand the outside turned to the correctdiameter. A simple jig is then used, locatingfrom the bored hole, and two holesdrilled to suit those which were ma-chined in the index bearing. The index plate is next placed in thejig, Fig. 15, being held on the pin A andlocated by the two holes drilled in thepreceding operation. The i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmachinery, bookyear19
