PATTERN MAKING 



89 



When turned and sand-papered, cut from the block of the 

 chuck by using a J-inch parting or cutting-off tool, care being taken 

 to cut close to the segments forming the half rim. Turn off the 

 face of the blocks on the chuck true and straight a second time, 

 and construct and turn the second .half of the rim in the same 

 way as described for the first; but great care must be taken to make 

 the two diameters, outside and inside, of each half exactly alike, 

 otherwise the work on one half will be lost. As it is difficult to 

 hold these two half rims for planing arid fitting together, a concave 

 and semicircular groove turned in the face of a second board, or 

 chuck, in which they can be laid while being planed or fitted, will 

 be found useful. 



Fig. 169. 



In all rim work of this kind the circular segments should be 

 cut lengthwise with the grain of the wood, the object being in this 

 construction, to do away, as much as possible, with all end wood. 



While waiting for the separate layers of glued segments to 

 dry, the arms should be made so as to be ready for the two half 

 rims when completed. 



The arms in this case should be made inch in thickness at 

 the hub and ^ inch in thickness where they enter the rim of the 

 wheel. The construction is us shown in Fig. 169. 



Five pieces, each 5f inches long, 2-J- inches wide, and f inch in 

 thickness are necessary. After being carefully fitted on the trim- 

 mer, a saw kerf -f$ inch deep is cut in each joint (a, Fig. 169), into 

 which a thin tongue of wood is inserted and glued, the tongues 



