22 



PATTERN MAKING 



Carefully lay out the block from which the core box is to be worked, from 

 a center line on the face of the block, describing on each end of the block 

 a semicircle of the required radius; connect the extremes of the two end arcs 

 by straight lines on the face of the block, as shown in Fig. 37. Two very thin 

 strips of hard wood are tacked along these lines, just outside of the wood to be 

 cut away, as shown at a and at bin Fig. 38. These strips form rests for the sides 

 of the plane while the heavier part of the work is being done. After work- 

 ing out the semicircle as far as the strips will allow, as shown by the dotted 

 arc apb, the strips are removed, when the work can be finished without 

 materially affecting the corners at a and b. 



When making the finishing cuts with this plane, care must be 

 taken to adjust the cutter centrally, i. e., so that it will cut equally 

 to both right and left; otherwise the work will not be correct. If, 

 however, the work has been done with care, the finishing may bo 

 completed with coarse, and- lastly with fine, sandpaper held on a 

 cylindrical block of radius slightly less than that of the required 

 core box. 



Fig. 37. 



Fig. 38. 



The Router Plane. This tool will be found very convenient 

 for smoothing out sunk panels, for letting in rapping and lifting 

 plates, and for all depressions below the general surface of the 

 pattern. It will plane the bottoms of recesses to a uniform depth 

 from the surface of the work, and will work into angles and 

 corners that otherwise could be reached only by the use of the 

 paring chisel. It is illustrated iu Fig. 31). 



The Spoke-Shave. The; spoke-shave is used by the pattern 

 maker for shaping and rounding out small curves either convex or 

 concave, which cannot be reached with the circular plane. It can 

 be found in a great variety of styles, either in metal, as shown in 

 Fig. 40, or in wood. The all-wood boxwood spoke shave illustrated 

 in Fig. 41, without brass facing or screw adjustment, is to be 



