Wm. C. Henderson
The device about to be described was originally designed and made for the purpose of grinding gouges used for wood-turning. Such gouges, when newly purchased, are not generally fully ground and sharpened, and when a considerable number of tools are to be ground, a great deal of time is required to produce an evenly ground edge, unless some form of holder is used which will obviate the necessity of light grinding and frequent examinations. This holder permits of manual training will find that with this holder grind. ing may be done by pupils after they have been given a little instruction.
The perspective view, Fig. 1, shows the general are rangement, with turning gouge in the holder, preparatory to grinding. It will be noted that the tool to be ground is held in a V-shaped trough, which is supported by an adjustable arrangement by which the tool can be held at angle against the wheel. A rear; adjustments to secure any commonly used angle, and when once set will ensure an evenly ground tool, even if the work be done by an inexperienced grinder. Of course this holder does not lessen the care which must be taken to avoid drawing the temper of the tool by too heavy pressure, but this danger is somewhat lessened, as the tool can be secured so that only a light pressure can be given. For these reasons, teachers of view, Fig. 2, and side view, Fig. 3, show more clearly how this is accomplished.
The two pieces forming the V-trough are made of wood strips 6 in. long, 1 1/2 and 1 1/4 in. wide and 1/4 in. thick. They are nailed together at right angles. Two pieces B and the piece C are then cut out with the grain of the wood of C running up and down, and of B parallel with that of the V-trough. The two pieces
B are cut from wood 3/4 in. thick and 1 1/4 in. wide and 3 in. long, the upper edges being beveled to an accurate fit to the V and secured thereto by glue and nails. This is not done, however, until the piece C has been cut out and the two pieces B fastened thereto. This piece is 1/2 in. thick, 3 in. wide and 3 1/2 in. long, the lower edge being cut to a semi-circle.
Two pieces D 1/4 in. thick are cut to the same size and shape as C and spaced by the piece E which is 3 In. long, and 1 in. wide and a little over 1/4 in. thick. These three pieces are glued and nailed together. In the end of a piece of 1 1/2 in. oak curtain pole cut a slot l 1/2 in. deep to fit over the pieces D and E, and securely fasten thereto with glue and wood screws. This pole is made long enough to give the necessary adjustment to height, as determined by the type of grinder in use. If mounted on a bench, a hole is bored through the same ,and a jamb-block fastened to the under side. This is a plain piece of 2 x 3 in. maple or spruce, having a 1 1/2 in. hole near the end, and a slot cut through for about 4 in. An ordinary bolt with butterfly nut and washers, serves to tighten the pole, which passes through the hole, in any desired position.
If the holder is desired for use in a lathe, the dimensions here given may be reduced a little, the jamb-block fastened to the under side to the bed by a bolt and strap on to ways.
When grinding gouges, a block of thin wood is fitted over the gouge with a drive fit, located so that it will touch the lower end to the V-trough. The grinding can then be done with the knowledge that the gouge cannot be ground more in one place than another, hence it will have that even bevel and rounding edge so desirable for turning.
The most suitable wood from which to make the holder is maple or birch, and when completed should be given a liberal coating of equal parts of linseed oil and turpentine; then two coats of shellac. This will prevent any warping and enable the holder to be easily kept clean.