The practical American millwright and miller: comprising the elementary principles of mechanics, mechanism, and motive power, hydraulics, and hydraulic motors, mill dams, saw-mills by Craik David

Author:Craik, David
Language: eng
Format: epub, pdf
Tags: Mills and mill-work, Hydroelectric power plants
Publisher: Philadelphia, H. C. Baird
Published: 1870-03-25T05:00:00+00:00

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■wherever the growth of timber is large; while in the Northern and Eastern States and adjoining British Provinces, where the timber is lighter, the single large circular is much oftener used.

It would be a useless occupation of tim^ and space to enter into a fuller or more minute description of these machines, as they are now made in regular machine shops by experienced workmen, who understand all the details of their parts and construction much better than we do, and as they are all completed and ready to set to work, the ordinary millwright or sawyer has nothing to do to one when it arrives from the shop but to put it properly together and run it. We will, therefore, only give such instructions as will enable the millwright or sawyer to do this.

First place the ways for the iron track perfectly raight and level, parallel with each other, and out of wind; then strike two chalk lines upon each way, the width of the iron track apart, for a guide by which to place the pieces of track. Place the track to balance equally between these two lines, but before fastening it down, stretch a line the whole length along the guiding corner of the track, if it be a square one; if V shaped, along the apex, and regulate any inequalities in the different portions by this line. Next place the sides of the carriage in position on the track, and then place the centre frame carrying the saw-arbor and machinery upon these, taking particular care to have the track and the arbor at right angles with each other. See that the arbor turns free in its boxes, without being loose. The saw collar makes a shoulder against the box, to prevent the arbor from shifting endways in that direction; a movable collar at the other side of the box forms the other shoulder; this should be placed about one-twentieth

of an inch clear of the box, to admit of end play, and made fast by its set screw. The nut and loose collar may now be taken off, and the saw tried on; it should be a little slack, both on the arbor a^d bolts, otherwise if the arbor should heat it might injure the saw. The loose collar may now be put on and tightened up by the nut; see that the collars fit perfectly true and even upon the saw; the fast collar should be true next the saw, but the loose one may be slightly concave. If they do not embrace the saw equally, rings of paper should be interposed to perfect the bearing, and the nut again tightened, now hold a gauge firm upon the saw guide against the side of the saw, and turn it round by the pulley and see if it runs true; if not, slips of paper must be put between the collar and saw at the point to which it inclines, until it does run true. When

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