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Title: |
1871 Manufacturer & Builder article: Tilting-arbor tablesaws |
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Source: |
Manufacturer & builder, Volume 3, Issue 10; pp. 220-221; October 1871 |
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Insert Date: |
2/25/2017 5:13:18 PM |
Complete text of the article:
ADJUSTABLE CIRCULAR SAW-BENCHES
Accompanying this article we present four engravings of the Grosvenor adjustable circular saw-benches, patented by J. P. Grosvenor, of Lowell, Mass. In these machines the disadvantage of raising the table for different varieties of work is entirely obviated by raising or lowering the saws themselves to any required height. Fig. 1 represents what is known as the adjustable double saw-bench. It is constructed of iron, weighs 1000 pounds, and is 4 feet 2 inches by 3 feet 6 inches broad at the top.
The saws or cutter-heads are secured to arbors which run in boxes attached to a sliding frame under the table, which is held within another frame set on an angle with the upright and horizontal portions of the machine. The saws or cutter-heads, thus mounted, are elevated or depressed to the required height by a screw turned by bevel-gears and hand-wheel - the latter projecting from the front of the machine. The incline is at such an angle with the center of the counter-shaft (which is attached to and a part of the machine) as not to perceptibly vary the length of belt by the varied position of the arbor.
The splitting-rest is jointed, so as to be inclined at any angle for sawing bevels. It can be readily removed, to admit of cutting long stuff. The squaring-rest or guide is hinged to the left hand portion of the table, and can be turned up on the table for use, or be unlatched and allowed to drop out of the way, as seen in the engraving. A light guide is also seen resting against the front of the machine, designed to be used for light work-its stem traversing a transverse groove in the top of the table. This and the one attached to the table are both made to swivel, to cut mitres either way.
The engraving represents a double machine-a double bench which is suited to carpenters, pattern-makers, cabinet-makers, and all varieties of work. The No. 1 single is the same as the double, except it has but one arbor; consequently the saws have to be changed from splitting to squaring. No. 2 single bench has no sliding table; the left hand portion of the table is narrow, and fastened permanently to the machine, and is designed principally for splitting. The half-bench, for railroad splitting, as required in planing mills, sets behind the carriage, and the saw can be raised and lowered for rabbeting, or in such a manner as to use so much of the saw as is required for the work in hand. The small mitre saw-bench is suited to door-makers, cabinet, and small fancy work of any kind.
Fig. 2 is the small mitre saw-bench. The saw is arranged to raise and lower, and the table is level. The latter is about 26 inches square and made in two parts, both parts being made to slide-the saw standing in the joint between them. The rests are adjustable, so as to be used either for splitting or squaring; also for mitreing, beveling, and grooving. When the machine is being used for splitting or grooving, the tables are held in place by a pin put through the table into the frame below. A double groove is provided in the left hand portion, so as to set the table further from the saw, to give room for a grooving cutter to run. It is a machine suited to sash and door-shops, cabinet, picture-frame, chilidren?s carriage work, and all shops where high speed and a fine, nice saw for light work is desired.
Fig. 3 is the swiveling mitre saw-bench, and Fig. 4, a sectional view of the same. These engravings so fully illustrate the machine that reference is only needed to the object for which it is arranged and the manner of using it.
The tables are of iron, always of one height, and level. They are made to slide open to the right and left, to admit of turning or adjusting the arbor-frame, so that the saw can be brought to a mitre with the table, or any intermediate angle desired from the mitre to the square. When the saw is adjusted, the operator then closes the joint by sliding tue tables up to the saw, and fastening them by a clamp-screw on the under side of the front end of the tables. The saw can be adjusted up and down to any desired height by means of the hand-wheel in front. By turning the hand-wheel seen on the end of the machine, the saw-carriage can be slid along on the front girt (to which it is gibbed) so as to bring the saw in the centre of the table, both ends of the arbor being fitted to receive it. There is a slide-rest on either side of the saw, so that the machine is complete for squaring, mitreing, or grooving crosswise to any breadth up to three feet in width, and when the saw is set at one angle with the table, the squaring-rests can be set at another; therefore any angle desired is easily obtained.
In the sectional cut the saw is shown as standing square with the table, and a splitting-rest on the left hand side of it. This splitting-rest can be used on either side of the saw desired. The countershaft is attached to the machine, and is a part of it. The machine is well adapted to use in all shops where wide mouldings or boards are to be mitred or beveled, and it is just as good an instrument for all purposes, when the saw is set square with the top, as a single machine would be of the other patterns. |
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