Page:Popular Science Monthly Volume 91.djvu/647

This page needs to be proofread.

Popular Science Monthly


��Cutting Brass Tubing Rapidly on a Buzz Saw

BRASS tubing can be cut off to the required lengths very much faster on a buzz saw than by any other method. A square cut is obtained in this way and by cutting with a set stop, lengths are made exact within a few thousandths of- an inch. As compared with cutting off in a lathe or milling machine or by hand the buzz saw

��A Labor Saving Wood Lift Built In Like a Dumb-Waiter

A PROPERLY built wood lift is a labor- saving device and may be made in- conspicuous by concealing it by means of a paneled door in the wall, as in the illus- tration. An open-faced box or cage is built and placed in two main braces, to which the pulleys are fastened, serving as guides. It runs between two heavy up-









��Parts, guide rails, location of ropes and counterweight for the construction of a wood lift to be

��built will show

��a house for the

��of labor. Sheet


multiplied production brass can be cut in the same way in thick- nesses up to l /i in. The metal heats in the thicker pieces, and gloves must be worn. A circular saw — not an ordinary wood- cutting saw — is used for cutting metal. These saws have a different temper from wood saws, have finer and different shaped teeth and have very little set. The tubes are held and the work is done just as if they were wood pieces.

��It is concealed by a panel in the wall

rights equipped with guide-rails. A third upright makes a "well" for ropes and a counterweight. Two lengths of 3/16-in. rope, A and B, with ends fixed in an over- head pulley-block, run to cage pulleys and back to sheaves fixed in the overhead block, and thence to the winch, as shown. A third length C connects the car with the counter- weight.

A lift built to an upper floor, with doors in the first and second floor walls, is almost

�� �