Page:Popular Science Monthly Volume 88.djvu/633

 Popular Science Monthly

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��A Two-Jaw Chuck

THOSE who have a wood-turning lathe sometimes find need of a small chuck. The follow^ing will be helpful to them :

The frame A of the chuck (Fig. 1) may be made from a wagon-tire or other piece of steel y^'' thick and V wide and as long as necessary. Bend over about %'' at each end, being careful to make the corners square. Drill a small hole in the exact center of the frame for the center G of the shaft (Fig. 2).

Fit a round iron ring B snugly on the shaft. Fasten this ring on the shaft with a key, set-screw, pin or the like. Secure this ring to the frame with four strong rivets D, Fig. 1.

Cut two slots C (Fig. 1) in the frame, as shown in the diagram. This is the hardest part of the work. The best way

���Fig. 1. Top view of the chuck, showing its parts and construction

is to drill holes not quite as wide as the slot, but as long, and file square. This will require patience.

The jaws E E (Fig. 2) will require some sawing and filing, but are not as hard to make as the slots. Get two pieces of steel 1" square and \V-2^ long, and file them to the shape and dimensions shown in the drawings, being careful to make the surfaces that slide on the frame fit as snugly as possible.

Thread two V^'-' bolts, F, round one end and file two flat places on the other, so they can be turned with a wrench. 1 )rill a seat in the ring B for the round end and let the other end project about Vj'' through the holes 2i\. K K (Fig. 2).

Drill a small hole close up to the end

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� ��Construction details of jaws of the chuck

of the frame and put a small pin through it to keep the bolt from coming out; or screw a small collar / / up as far as it will go and fasten it there (Fig. 2). The bolt goes through the hole H in the jaws, which is tapped to fit. By turning the bolt the jaw may be made to slide along in the slot.

To get the jaws in the frame, the up- per end of the slot must be widened. Then the jaws may be put in the slot and turned around.

How to Wind Springs Easily

WHEN winding small springs with a lathe, much time is consumed in unraveling the wire from the spool, which is necessary to prevent tangling. The following method is quick and saves the end pieces. The supports. A, A, shown in the diagram, may be fastened

���Fig. 2. Side view of the chuck in position on the shaft

��With this scheme, time and wire are saved in winding small springs on a lathe

directly to the bench, or to a board. Drill holes in each support to receive the rod holding the spool. A collar C for holding the parts together, is fas- tened to each end of the shaft inside the supports. The board D is attached to the bench by a hinge, as in the diagram. On its upper end is a block of wood, which fits over the spool between the flanges. A piece of heavy felt is at- tached to the under side of the block. This takes uj) the irregularities, when the layers of wire change. The spring /: holds the block firmly against the v>-ire. The tension on the spring should not be so great as to cause trouble in pulling the wire from the spool. — C. Axdersox.

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