Masonry Magazine August 1963 Page. 20
CONTRACTORS!
PREVENT
UNSIGHTLY
CRACKS
USE
WAL-LOK
MORTAR JOINT REINFORCING
BECAUSE:
THE EFFECTIVENESS OF REINFORCING IN MASONRY WALLS DEPENDS ON THE AMOUNT AND TENSILE STRENGTH OF THE STEEL IN THE MORTAR AND THE BOND OF THIS STEEL TO THE MORTAR.
WAL-LOK puts 19.2% more steel in the mortar where it counts.
WAL-LOK is double deformed for maximum bond.
TENSILE STRENGTH of steel is retained.
PROJECTING CROSSRODS give 4 mortar locks at each weld.
CROSSRODS hold WAL-LOK up for complete embedment.
WAL-LOK, in all grades, complies with or exceeds Government specifications.
Write for New Descriptive Brochure and Name of Distributor nearest you.
WAL-LOK
DIV. of LENAWEE PEERLESS, Inc.
P. O. BOX 516
ADRIAN, MICHIGAN
MASONRY CUTTING
and Answer
Questioll
Korner
We have received a query from Mr. B. H. of San Francisco, California concerning the advisability of using a 14 inch blade on a 20 inch saw. He writes as follows:
QUESTION: Is it true that using a 14 blade on a 20 saw will reduce the life of the blade by an appreciable amount, I'm in the market for a new saw and can't make up as to which saw to buy. Most of my cutting is done with a 14" blade but occasionally I would use a larger blade if I had the saw for it.
ANSWER: Using a 14" blade on a 20" sow will definitely reduce the life of a blade, a considerable amount.
Here's why: Normally a 14" blade operates at a shaft speed of approximately 3200 RPMs. A 20" blade, because of the larger size, operates at a shaft speed of 2400 RPMs. Repeated tests by Independent Testing Laboratories have shown conclusively that a 14" blade run at the slower shaft speed at which a 20" blade operates, will greatly reduce the blade life considerably. Use the 14" blade at the correct higher RPM and make full use of the available higher horsepower of the electric motor.
From Philadelphia we have received a question that has long plagued masonry saw operators. Mr. B. B. writes to ask:
QUESTION: I have experienced trouble on jobs when I have to run long extension cords to masonry saws. Do you have a chart you could send me, or if not, how about printing sizes and lengths of extension cords that ordinarily provide sufficient power for a masonry saw.
ANSWER: One of the most frequently neglected items of masonry saw operation is the important motor. Today's masonry saw motors are very powerful and require plenty of "juice". The worst enemy of electric motors is starvation due to an insufficient supply of electricity. Lines that are too small, poor plugs and switches, corroded switch terminals combine to introduce barriers into the circuit.
Following are the maximum permissible extension cord lengths:
1162 H. P.
3 H. P.
115 V
230 V
115 V
230 V
No. 12 wire
25 fr.
100 ft.
50 ft.
No. 10 wire
50 ft.
150 ft.
25 ft.
100 fr.
No. 8 wire
75 ft.
250 ft.
50 ft.
150 ft.
No.
6 wire
75f.
250 ft.
Ordinary plugs are not satisfactory to carry the high current required. The wires should be spliced together and soldered, or pressure type solderless connections should be used. If plugs must be used, one with a minimum capacity of 30 amp., similar to those used on electric ranges should be used.
Whenever possible, the saw should be operated on 230 volts. If this power is available, and the saw must be operated on 115 volts, make certain the proper extension cord lengths are adhered to.
In '64
It's the
Sherman
House
Chicago
Feb. 15-18
VITRITILE
Ceramic Glazed
Structural
Facing Tile
"The complete line of
quality clay products
for masonry construction"
natco corporatio
General Offices: 327 Fifth Ave., Pittsburgh 22, Pa
DISTRICT SALES OFFICES
Birmingham, Ala. Detroit, Mich.
Philadelphia, P
Boston, Mass.
Chicago, Ill.
Houston, Tex.
Pittsburgh, Pa
New York, N. Y.
Syracuse, N. Y.
MASONRY.
August,