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1943 - new brush used for brushing the inside diameter of many areas


CD 2055037 E&MP4.005

Brushes, Carbon

June 27, 1943

(upper left)- Osborn’s “Situft” No. 42-K-16 with Holder No. CM 19080, mounted on a portable tool fastened to a bench motor is used for brushing the inside diameter of a guide. This brush is 1 inch outside diameter, of .005 wire with a 7 inch stem.

(upper right)- Another method of removing burrs at intersecting holes is by mounting “Situft” No. 42-K-12

(without holder)- and mounted in a drill press. The part is held in a work-holding fixture

(lower left)- This is the “Situft” extractor -- a pair of pliers, one end grooved with the other end cut out to fit the “Situft” holder. This is recommended as the easiest method of removing the brush from the holder.

(lower right)- This illustration shows the method of inserting the brush into the holder.

additional text found


The Osborn Manufacturing Co.
5401 Hamilton Ave.
Cleveland, Ohio


A new series of “Situft” power brushes and brush holders, recently developed by The Osborn Manufacturing Company, world’s largest producer of brushes for industry, and thoroughly tested during the final days of war production, will bring the American consuming public their long-awaited automobiles, radios, vacuum-cleaners and other household applications much sooner than otherwise would have been possible.

The new “Situft” series of relatively small, versatile brushes, (See accompanying illustrations), is being hailed by the brush and other industries as one of the most important developments in years and one that will eliminate many manufacturing bottlenecks by speeding up “hard-to-get-at” jobs that formerly were either performed by slow, expensive and cumbersome methods, or were thought to be impossible of accomplishment.

Utilizing a new principle of wire suspension under pressure and equipped with a variety of holding tools designed for use in drill presses, bench grinders and other special production and deburring tools and equipped with high grade crimped wire, the new power brushes are saving thousands of dollars in production costs and conserving many thousands of man-hours, according to reports received by Osborn from industries which have had them under test for two years.

The new series is available in a variety of sizes. Outside diameters range from ¼ inch to 1-¼ inches, brush face lengths from 9/16 inch to N inch, stem sizes to fit 9-, 3/32-, and 7-inch chucks, overall length from 2-7 inches to 2-3 inches and the gauge of wire used ranges from .003 to .005 inch. Their shipping weight ranges from two to four and one-half ounces.

An attractive kit containing 12 different sizes of “Situfts” and two sizes of the special holders are being furnished by the company to its 1500 distributor salesmen throughout the nation. The kit features a block which holds the brushes and holders in place according to size and sells for $2.85.

They have been tested on both long and short shafts for close-tolerance operations, for removing insulation, rust, mold marks and for a large number of operations requiring deburring, cleaning or finishing small diameter inside surfaces.

One of the convenient holders designed for many production operations fits into the standard 3-inch air chuck of portable tools and an easy method has been devised for inserting or removing the brush from holders with special pliers.

Reports of tests from important branches of industry indicate that the “Situft” has been responsible for the elimination of serious production bottlenecks and has increased the speed of certain manufacturing processes from three to five times their former schedules. One operation which was formerly only 40 percent efficient is now being completed on a more thorough basis and at one-third of the former cost.

Reworking of parts is now virtually eliminated. In another operation in the same industry savings aggregating $7 per 1,000 pieces have been recorded.

Aluminum parts manufacturers report that an operation which formerly required four hours for the removal of flaked metal from 65 bolt hole can now be performed with the “Situft” equipment on 360 holes in the same length of time. Another manufacturing process in this industry is being accomplished in one-third less time than in the past and in an oil-hole cleaning process four times as many holes are being cleaned each hour than was formerly possible.

Reports of 36 manufacturing processes in which the new “Situft” power brushes and holders have been tested are contained in technical data assembled by the world’s largest manufacturer of power brushing equipment.

Here are a few of the results obtained on tests:

In cleaning the inside hole and copper terminals of Ceramic resistor parts in the radio parts industry, a production speed three times greater than under former methods was achieved. In cleaning the inside diameter of radio antenna parts, the brushes and holders cleaned 50 units compared with 12 previously accomplished by valve guide brushes.

Smoothing and thoroughly cleaning drilled holes in various engine parts constituted a bottleneck of a most serious nature, manufacturers reported. Introduction of the new brushes on this operation eliminated this bottleneck within a short time. A manufacturer also reported that in removing burrs from threaded holes in rocker arms, the new brushes last two and one-half times as long as tube brushes formerly used. Another operation which calls for cleaning the inside walls of the ceramic barrels of spark plugs is now being done at one-half the former brush cost and in three-fourths of the time formerly consumed.

Reports from the gun, bomb parts and ammunition manufacturers have been equally outstanding. In a rust-removing operation on 37 [sic] millemeter M-51 and M-80 shells, for example, sandblasting was eliminated entirely and brushes formerly used to remove sand and grit have been dispensed with. The “Situft” brush and holder, and a rust-preventative oil, is producing results that are far more satisfactory, the manufacturer reports.

The new Osborn product is cleaning threaded holes and removing rough edges of a plastic fuse part for 61 and 80 [sic] millemeter mortar shells at the rate of from 4,300 to 4,500 pieces a day. Another operation calling for the removal of burrs from tapped threads in the M-48 fuse body was formerly only 40 percent efficient. The new brush, this manufacturer states, lasts three times as long as other brushes used and costs only one-third as much. Most of the reworking of parts has been eliminated.

In preparing copper terminals for soldering, during the manufacture of a secret device for war use, two “Situfts” are used simultaneously in a special holder. The operation now takes only three seconds and is being accomplished in a highly satisfactory manner. It was impossible to complete the operation by brushing heretofore.

Other examples of unusual accomplishments have been compiled from new usages in connection with the removal of burrs from threaded holes in steel parts, in the removal of excess rubber from the interior of flexible tubing, in removal of heat scale and white lead composition in small gears and in numerous other burring, cleaning and polishing phases of manufacturing processes.

The most versatile “Situft”, according to Osborn, is the model equipped with .005 SA wire, and mounted on motors varying in speed from 500 to 25,000 revolutions per minute, depending upon the task it is to perform.

Brushes used in the processes covered by the report range from 3 inch to 1-7 inches. In a cleaning operation on a porcelain electrode part, a N-inch brush is used made of .010 nylon. This type also is being used on a sparkplug cleaning operation at one-half the cost of the method formerly used and in three-fourths of the time previously allowed.

The brush holders which are designed for use on these brushes are constantly increasing their adaptability which often permit stock brushes to be used in a way that enable them to contact definite surface areas regardless of their shape.

Original Caption by Science Service
©Osborn Mfg. Co.

National Museum of American History


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