Success in filing a timber saw depends on two factors: (1) the light, and (2) some clamping device which will hold the saw free from vibration while the work is being done.
The saw clamp shown in Figure 64 is designed to be used independently of a metal-working vise, and may be taken where-ever the light is good for the work. It may be taken to the wood lot and used as needed, as well as in the farm shop.
The framework of the clamp consists of two pieces of 2 by 4, each 48 in. long, a brace at the bottom, and two braces which are placed diagonally. Any scrap material will do for the braces. The sizes shown are suggested because they are sufficiently strong to hold the clamp rigid and also are rather light. Posts over 48 in. long are suggested for filers who are over 5 ft. 9 in. tall.
The detail sketch A shows the dimensions of the notch which is cut in the top of each post.
The jaws are made of two pieces of %-im lumber, 6 in. wide and 5 ft. 6 in. long. Hard wood is the most suitable. The shape zo cut the jaws depends on the saws to be fitted. If the blade of the saw is straight, the top edge of the clamp may be left straight; but if it is an arc, the tops of the jaws are cut as shown in the drawing, the arc conforming to the arc of the saw. To lay out such a large arc, the board may be placed on a barn floor or other large open space and a string used as a radius to swing the arc and pencil. In this way, a regular curve may be obtained. As may be noted in the detail drawing B, which shows the ends of the jaw, the outside edge of each jaw is chamfered. The draw-knife is a suitable tool for removing the corners for the chamfer.
The two jaws are held together with three pieces of leather which are nailed to the bottom edges, one at each end and the third at the center. A space 3/16 in. wide is left between the two jaws for the saw blade to slip into, so that it will be clamped at the top edge near the teeth.
It should also be noted that the 14-in. holes are bored through the jaws % in. apart, at points near the places where the jaws fit on the posts.- By placing a spike in a hole at each end, a means is provided for holding different widths of saws up at the proper distance above the tops of the jaws to make them easy to file.
To do a good job in filing a saw, the blade must be held free from all vibration. This may be accomplished with the two jaws only of the clamp, if they are held in an ordinary metal-working vise. It is seldom, however, that the vise is so placed that the light will shine on the points of the teeth, and for that reason it is not very satisfactory. A hand screw is very suitable for holding the clamps tight at the top edge against the blade of the saw, b
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