The punch ([Fig. 102]), used to make the nail-holes in the shoe, has a dull point, which should correspond in size with the head of the horseshoe-nail and have slightly rounded corners.
The pritchel ([Fig. 103]) should not taper to a point, but should end in a rectangular surface whose length is twice its width, in order to punch iron through the shoe under the blow of the hammer.
Making the Shoe.
To make a flat shoe, take the length of the hoof from the point of the toe to the buttress and the greatest width of the hoof; these two measurements, when added together, give the length of the bar for the shoe. The bar should be of such width and thickness as will require the least amount of working. For a bar-shoe or a shoe with heel-calks the bar must be correspondingly longer.
Should we wish to preserve the exact outline of the plantar border of the wall, we may advantageously use such a podometer as is shown in [Fig. 104]. This consists of a perforated sheet-iron plate one-sixteenth to one-twelfth of an inch thick. This is laid upon the hoof, and the outline of the wall marked upon it with chalk.
If necessary, the hoof may be set on a piece of smooth, stiff wrapping paper or card-board, and the outline of the wall closely traced with a lead pencil.
Fig. 104.
Podometer.
To make a front shoe ([Figs. 107] and [108]), heat the bar white-hot just beyond its middle, place the head of the sledge hammer across one end of the face of the anvil, hold the unheated end of the bar on the head of the sledge,—the heated end resting on the face of the anvil, and bend the bar into a half-circle with the round head of the turning-hammer. (The outer branch of all shoes is made first; in making pairs the right shoe is made first.) The extreme end of the heated bar is drawn out to the desired width and thickness with the sledge. The bent branch is then placed obliquely across the heel of the horn of the anvil, is turned over toward the right till it rests upon an edge, and is then bevelled diamond-shaped from the toe to the end of the branch. [The edge in contact with the horn is the inner edge of the right branch (outer branch) of the right shoe; the edge beaten down by the hammer is the outer edge of the outer branch.] The branch is then flattened on the anvil because in the bending the outer edge has been stretched and thinned, while the iron of the inner edge has been crowded together (back-set) and thickened. In flattening, the shoe should be left a trifle thinner on the inner edge. The branch is again placed over the horn, and gone over lightly with the flat head of the turning-hammer and brought to a proper shape. It is now to be concaved with or without the help of the sledge, or the concaving may be omitted. The concaving should end about three-fourths of an inch from the end of the branch. Now turn the branch and fuller it, or fuller it first and concave afterwards. The fuller should be set in about one-twelfth of an inch from the edge for small shoes, somewhat more for large shoes, and led from the end of the branch towards the toe, twice being necessary to make the fullering of sufficient depth. Next, stamp the holes, punch them through with the pritchel, run over the surfaces, go over the outer edge of the shoe upon the horn, and, finally, hammer the bearing-surface smooth and horizontal. The left branch is made in the same way, except that it is turned to the left and the fullering carried from the toe to the heel. Any ordinary shoe can and should be completed in the rough in two heats. One pair of shoes requires from eight to fifteen minutes.