The American National Standard is intended to regulate the set of blades for safety as well as optimal use, since a badly made saw can be a hazard. Hacksaw blades with teeth per inch teeth per cm must be set wavy.
Other types of saws require a "raker set" in which every third tooth is left unset. The composite of the metal used is also regulated. A standard steel blade, in order to be called that, cannot be more than 1. Thanks to such user-friendly optimization software as computer aided design CAD , refinements are being experimented with that may retard the effects of repetitive motion on the handsaw user.
Goals include spreading the impact of using a saw over a larger area, reducing the need for sharp corrective movements, and improving the fit of the handle to avoid uncomfortable hand and arm positions. Volunteer test groups are used to gauge consumer needs and professional users test prototypes of products under development.
The same approach is being made towards improving both large and small scale power tools. Computer-aided manufacturing CAM , computer-integrated manufacturing CIM , and numerical control NC techniques allow saw manufacturers to cut waste and improve efficiency. Circle saws in the lumber industry have been reinvented with the help of finite element analysis.
The Saw Paw Corporation of Pennsylvania holds patents on a recyclable, one-piece carbide saw shank and bit. The streamlined design is geared towards improving efficiency, while lengthening life expectancy, in order to lower the long-term cost of use. Armentrout, Patricia and David. The Saw. Rourke Publishers Group, Disston, Henry. The Saw In History. Goodman, W. The History of Woodworking Tools. Bell and Sons, Ltd. Christianson, Rich.
Toggle navigation. Made How Volume 3 Saw Saw. Another type is the electric hacksaw, which is charged with a motor or stationary engine. The latter type is still produced but is somewhat limited in use. The history of the power hacksaw machine is associated with regular hand saws. Handsaws per se have been present since the time of the ancient Egyptians.
Hieroglyphics in that era showcased the importance of wood in the community and how the Egyptians dealt in cutting it. Modern versions of the hand saw are based on the first one developed by the Kulibert Saw Company. As the demand to cut and saw harder types of materials grew, the power hacksaw was developed and created to alleviate the effort in doing the procedure.
Alex Tree. Please enter the following code:. My invention then consists in the construction, combination and arrangement of parts herein described and claimed, and illustrated in the accompanying drawings.
In these drawings, in which similar reference characters designate corresponding parts in all views, I have shown a preferred embodiment of my invention, and. Figure l is a side elevation of a hack saw blade embodying the invention;. Referring to these drawings, 1 designates a hack saw blade on which are provided teeth 2, 3, 4, the teeth 2 and 3 being alterr nately offset as described in my said copending application and differing from the usual offsetting in that the portion of the blade carrying the teeth 2, 3, is provided with corrugations so that the metal of the teeth is substantially parallel to the depth of the blade, the teeth 2 being ofiset to one side of the blade, and the teeth 3 to the other side, and the cutting edges are substantially perpendicular to the depth of the blade.
These offset teeth 2, 3, are preferably arranged in groups at intervals along the length of the blade, and in the intermediate spaces there are provided teeth 4 which pro ject straight down, in the plane of the blade, and consequently project below the cutting edges of the corrugated teeth by an amount indicated it on Fig. This result is brought about by reason of the fact that as the corrugations for the teeth 2, 3, are formed, the metal carrying the teeth being forced sidewise, is, as shown in Fig.
0コメント