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Wood-screw.

A metallic screw for carpenters' and joiners' use in securing pieces of work together. A wooden screw, which is one made of wood, is used in clamps, carpenter's benches, bedstead-rails, etc.

While there are many machines for this purpose, and several variations in the order of the process, the following may answer, in a general way:—

Wood-scraping machine.

Wood-worker (molder side).

The wire is placed upon a reel, and the end inserted between a pair of feed-rolls which feed it to the header, a machine which cuts the wire into the lengths to which it is gaged, and sets up the heads, which is done by pressing the end of the wire into a die. The screw at this stage is called a blank. The next process is that of cleaning the blanks from grease and dirt; they are placed in iron boxes filled with white-pine sawdust. These boxes are revolved rapidly, and the friction of the blanks against each other and the particles of the sawdust cleanses them perfectly and makes them bright. After cleaning, the blanks are placed in the hoppers of the shaving-machines, from which they are picked up by claws, inserted in spindles which turn the head, cut the slots, and eject them into boxes. They are then placed in the hoppers of the finishing-machines, which automatically complete the process of pointing and cutting the thread.

Wood-worker (squaring — up and facing side).

Wood-screws are classed by the length in inches, and by the number, which indicates the size of the wire, or body of the screw.

The following table of dimensions, derived from measurements of the screws made by the New England Screw Company, at Providence, R. I., will be found convenient for reference:—

No.Diameter of body.Head.Number of threads to 1 inch.
Diameter.Thickness.
In.In.In.
30.100.200.0624
4.11.22.06524
5.13.26.07520
6.15.30.0820
7.16.32.08518
8.17.34.0914
9.19.38.09513 1/2
10.20.40.1013
11.21.42.1112
12.22.44.1211
13.23.46.1311
14.24.48.1410
15.25.50.1510
16.26.52.169 1/2
17.27.54.179
18.28.56.188 1/2
20.30.60.208
21.32.64.218
22.35.70.227 1/2
24.38.76.247
26.40.80.267

The length of thread cut is two thirds the length of the screw.

1877.

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Providence, R. I. (Rhode Island, United States) (1)
New England (United States) (1)

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