Page:Popular Science Monthly Volume 88.djvu/303

 For Practical Workers

���To Prevent Bolt from Turning When Unscrewing Nut

HE bolt will of- ten turn in unscrewing nuts, and should it be

���T

��This file prevents the bolt from turning

��a carriage bolt difficul- ty is often experienced in unscrew- ing the nut at all.

T he a c- companying illustration shows a very simple method of preventing the bolt from turning, by simply clamping a coarse file over the head of it, as indicated.

Saw Box

THE saw box illustrated is one which has proven itself well worth while. In cutting a large number of pieces to the same length it was found that the old-fashioned box soon became inaccurate, due to the contact of the teeth of the saw with the edges of the guides. To obviate this trouble and se- cure a more permanent and serviceable box this one was designed.

The drawing requires very little ex- planation. Hardwood, preferably maple, is used throughout. The saw is first equipped with the two strips of wood, one on either side. These are bolted on to the saw with two Vl" x 1" stove bolts, heads and nuts set flush to allow the saw to pass between the vertical guides. The holes may be readily

��punched in the saw by means of a good punch. Hold the saw on the end grain of a block of hardwood and keep the holes at least %" from the edge, in order to avoid cracking the saw.

As the saw will be found a little thicker at the heel than the point, as well as at the teeth, than the back, the boards will have to be dressed down to bring them the same thickness at every point, after they have been bolted on. Be quite certain to take the same amount from each board.

Next work out the parts for the box and carefully assemble the boards at one end. Place the saw in position and assemble the boards on the other end, being certain that there is just enough play to allow the saw to move freely, but with no shake. A little beeswax or floor wax on all the guides will keep the saw moving freely and easily and will also prevent wear.

All excellent depth gage can be ar- ranged as suggested in the sketch. A fine tooth saw will give best results. The saw is always available for other work by removing the screws and taking ofif the boards. The holes in no wise in- terfere.

���/a X3'X SAW LENGTH

��This saw box will be found more perma- nent and serviceable than the old-fashioned box

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