SMALL SAWMILLS, THEIK EQUIPMENT, ETC. 33 
underneath 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 3J 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 
3J or 4J 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 30 
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 
