Scientific American Supplement, No. 312, December 24, 1881 eBook

This eBook from the Gutenberg Project consists of approximately 107 pages of information about Scientific American Supplement, No. 312, December 24, 1881.

[Illustration:  Metal shaping.]

By moving the pattern in contact with the table and the mandrel, while the latter revolves, the edges of the work will be shaped and finished at the same time.  By substituting a conical cutter for a cylindrical one, the work may be beveled; by using both, the edge may be made smooth and square, while the corner is beveled.

The tool shown in Fig. 12 might properly be called a barrel saw.  It is made by drilling in the end of a steel rod and forming the teeth with a file.  To avoid cracking in tempering a small hole should be drilled through the side near the bottom of the larger hole.  To insure the free working of the tool it should be turned so that its cutting edge will be rather thicker than the position behind it.  This tool should be made in various sizes.

Tools for gear cutting and also cutters for wood have not been mentioned in this paper; as they are proper subjects for separate treatment.

WOOD WORKING.

It is not the intention of the writer to enter largely into the subject of wood working, but simply to suggest a few handy attachments to the foot lathe which will greatly facilitate the operations of the amateur wood worker, and will be found very useful by almost any one working in wood.  It is not an easy matter to split even thin lumber into strips of uniform width by means of a handsaw, but by using the circular saw attachment, shown in Fig. 1, the operation becomes rapid and easy, and the stuff may be sawed or slit at any desired angle or bevel.  The attachment consists of a saw mandrel of the usual form, and a wooden table supported by a right angled piece, A, of round iron fitted to the toolpost and clamped by a wooden cleat, B, which is secured to the under side of the table, split from the aperture to one end, and provided with a thumbscrew for drawing the parts together.  By means of this arrangement the table may be inclined to a limited angle in either direction, the slot through which the saw projects being enlarged below to admit of this adjustment.

[Illustration:  Woodworking attachments for the foot lathe.]

The back of the table is steadied by a screw which rests upon the back end of the tool rest support, and enters a block attached to the under side of the table.  The gauge at the top of the table is used in slitting and for other purposes which will be presently mentioned, and it is adjusted by aid of lines made across the table parallel with the saw.

For the purpose of cross cutting or cutting on a bevel a thin sliding table is fitted to slide upon the main table, and is provided with a gauge which is capable of being adjusted at any desired angle.  For cutting slots for panels, etc., thick saws may be used, or the saw may be made to wabble by placing it between two beveled washers, as shown in Fig. 2.

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Scientific American Supplement, No. 312, December 24, 1881 from Project Gutenberg. Public domain.
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