SMALL SAWMILLS, THEIR EQUIPMENT, ETC. 33 



underneatli the far rail of the track. Never make the mistake of 

 placing the large gear wheel between the pinion and the saw; it 

 should be outside of the pinion. First set the husk frame and 

 secure it to the bed timbers just where you want it. Then put the 

 large gear wheel, with its shaft which carries the rack pin on into its 

 proper bearings, in the central section of track timbers just where it 

 is to work. Then lay this section of track timbers in position on the 

 bed timbers beside the husk frame and push it forward until the 

 large gear comes into proper mesh with the feed pinion on the end 

 of the sliding friction shaft. The inside stringer next to the husk 

 frame has the flat track attached to it, and is higher than the outside 

 stringer, to provide for the difference in height of the flat and V track. 

 The V track is placed on the outside stringer. When track string- 

 ers are not shipped with the mill, care should be taken to have the 

 inside stringer higher, in order to bring the top of both tracks on a 

 level. Stringers may be made of any size timber, but where the rack 

 pinion shaft passes through the inside stringer the thickness must not 

 be over 3| inches, otherwise the track pinion can not be lined with 

 the rack on the front side of the carriage. (When the mill is a large 

 one, No. 4 or over, this does not apply.) When stringers are not over 

 3^ or 4^ inches the crossties should be placed 18 inches apart, but if 

 heavier stringers are used the ties can be 2 feet or more apart. 



The husk and track stringers are not always on the same level on the 

 large cross sills. In most cases the head block base must be elevated 

 by placing a separate piece of timber under each end of the husk 

 on top of the cross sills. Head blocks should be 1 inch above the 

 saw collar. Do not line up under the head blocks, but raise the 

 stringers or lower the husk frame until the blocks are in proper 

 position. 



To insure square, accurate lumber the husk frame, track, car- 

 riage, and head should be set perfectly level. The nose or front 

 end of the head blocks should clear the saw by one-half inch. Set 

 the track perfectly parallel with the front side of the husk frame 

 and see that it is true and level from end to end. After setting the 

 head blocks and set works on the carriage, pull the knees forward 

 until they are even with the front end of the head block bases, then 

 tighten the set-shaft coupling, and after that raise the set shaft so 

 that the pinions will mesh deep enough in the racks under the knees 

 to take up all lost motion. Then fasten the set-shaft bearings on 

 the side of the head block base. These bearings are adjustable, to 

 provide for raising and lowering the set shaft. Run the knees back 

 and forth a few times to see if they come up even with the nose of 

 the bases. If there is any variation it can be adjusted by the set- 

 shaft coupling. The mandrel must be level, and the journal must 

 fill the boxes and should be so constructed that there will be no 

 63262°— 18— Bull. 718 5 



