130 



THE WOODWORKING PLANT 



(B) FLOORING. The flooring machine 

 is a double surfacer having an additional outfit 

 of two side cutters revolving on ratchet spindles 

 and cutting tongues and grooves. 



The machine weighs 5 tons and more. 



The usual flooring made is oak, pine, 

 maple, beech, birch, and red fir flooring. 



Planers and flooring machines must be 

 provided with folding hoods connected with 

 blowers or exhaust fans, so as to prevent 

 the shavings from clogging up the machinery 

 or from pressing themselves into the planed 

 surfaces. 



Planer and matcher, made by Schmaltz, Offenbach, Germany. 



Parts of tong-ue flooring head taken apart. 

 S. A. Woods Machine Co., Boston, Mass. 



The proper alignment of tiie various bits or 



knives in a given cutter-head presents a problem 



of extreme difficulty. To begin with, the operator 



may succeed in adjusting the cutting edges so as 



to make them partake in one and the same mathe- 

 matical circuit :- Still, a difference in the temper 



of the steel of the cutters, however slight, will 



allow one edge to become dull quicker than the 



other; or centrifugal force will throw the heavier 



and the lighter of two cutters out of the original 



alignment. This danger is great particularly with 



speeds exceeding 4,000 revolutions per minute. 

 When the bits are getting dull, nfter two hours of 

 work in hard wood, the tongues made at the beginning of the period will fail to catch the grooves made at its end. 

 Automatic truing devices may be used, whilst the machine is in operation, to secure a high degree 

 of uniformity in the work performed. 



Flooring head (side head). S. A. 

 Woods Machine Co., Boston, Mass. 



Flooring head (side head). S. A. 

 Woods Machine Co., Boston, Mass. 



