way. As soon as the clutch is tripped, the guard sweeps completely beyond the press feed area on the first half of the downward stroke. Thus the operator's hands are brushed aside before the die closes.

An entirely new feature of this guard is the automatic counter which registers each stamping. This counter, from which the guard derives the name "Counting-Guard," is mounted on the cross-bar. Since most punch press work is handled on a piece-work basis, the automatic counter serves the double purpose of keeping the operator aware of his piece-work rate and making it necessary for him to keep the guard in its safeguarding position in order to register or count the number of pieces produced. Thus the employe is given an incentive for using the guard properly to protect himself from injury while the employer has an accurate record of the die stampings produced by each operator. An important feature of this guard is that the entire assembly can be quickly swung aside to permit access to the dies without the use of

wrenches.

Three New Insert-Chaser Die-Heads

Fig. 2. Solid, Adjustable Die-head with Insert Chasers

Three new die-heads have been de

veloped recently by the Eastern Machine Screw Corporation, 23-43 Barclay St., New Haven 6, Conn.

The Style DMT insert-chaser die

Diamond Cup-Shaped

Honing Wheel

The Precision Diamond Tool Co.,

102 S. Grove Ave., Elgin, Ill., has diamond cup-wheel developed for placed on the market a metal-bonded

diamond honing operations. The new

Fig. 3. Die-head that Permits Tapping while Threading

cision of the dial indicator. It can be used as a dial indicator comparator without the necessity of setting to a master gage, the micrometer feature furnishing its own precision setting.

spindle is brought in contact with When used as a micrometer, the the work until the dial hand indicates zero. The measurement is then read on the barrel and thimble of the micrometer. Used as an indicating comparator, it can be set to the nearest thousandth of an inch, and the variation from that setting can then be read on the dial. In both cases, the anvil pressure is constant, and therefore permits the full accuracy of the instrument to be utilized.

The micrometer scale and the in

dicating dial have 0.0001 inch gradpacity range is from 0 to 1 inch. In uations, and the full measuring causing the instrument as a compar

taper pipe threads when mounted on Brown & Sharpe automatic machines.

The head of this die opens gradually to form the taper, and it is said to eliminate marks along the thread such as are usually present when a "jam" cut is made.

Fig. 2 shows the Style SAM, and

Fig. 3, the Style SMM, size No. 103.

Fig. 1. Insert-chaser Die-head for Cutting Taper Pipe Threads

208-MACHINERY, January, 1946

diameters and 500 mesh for mountdiamond cup-wheels used on standing on the inside of 6- or 7-inch ard carbide-tool grinders.

the large wheel, the operator can After rough-grinding the tool on produce a fine cutting edge in a few

seconds with one stroke across the smaller diamond honing wheel, using the same protractor set-up. This process eliminates the hand-honing and regrinding operations ordinarily required. 91

Micrometer with Dial
Indicator

A micrometer equipped with a dial indicator has just been introduced to the trade by the Federal Products Corporation, 1144 Eddy St., Providence 1, R. I. This new type of micrometer is designed to combine the accuracy of the conventional micrometer over the full 1-inch range of its measuring screw with the pre

in the desired position by a new type grip without affecting alignment acof clamp which provides a uniform

curacy. The opposite anvil is rethumb button. This enables the work tracted by pressure on the finger or to be inserted with less chance of

having its surface scratched by the

anvils, and also prevents excessive

Furnace for Preheating
Magnesium Sheets

Production at the Consolidated Vultee Aircraft Corporation, Benbrook, Tex., required the preheating of magnesium sheets before forming. The furnace illustrated was designed and built by the Despatch Oven Co., 619 S. E. Eighth St., Minneapolis 14, Minn., for this purpose.

The furnace was made portable by mounting it on casters to permit moving it from one press brake to another. By positioning the furnace close to the press brake, temperature drop of the sheet in transferring it to the forming machine was min

Despatch Portable Magnesium Sheet Preheating Furnace

Rotary Pump of Aluminum Construction Built by the McIntyre Co.

Riverdale Ave., Newton 58, Mass. This series of pumps will deliver from 1/2 gallon to 3 gallons per minute, at 1750 R.P.M., with pressures up to 1000 pounds per square inch.

Over-all dimensions are 3 1/4 inches high, 2 1/4 inches wide, and 2 3/4 inches deep. The pumps are of aluminum construction with nitrided gears and shafts, and weigh only 1 3/4 pounds. Standard models are designed for direct motor, flexible-coupled drive, but pumps can readily be supplied for other types of drives and various mounting conditions. Power requirements at maximum pressure varies between 0.40 and 2.25 H.P. .96

General Electric Arc-
Welding Compound

An arc-welding compound designed to aid in instantaneously creating and maintaining a metallic welding arc where low currents and smalldiameter electrodes are employed has