Popular Science Monthly 



605 



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 



1 



^yr/i 



\/uce 





■i\ 



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. 



