How To Select
The RIGHT Drill Bushing - Page 2
The slip lock is used where more than one operation is performed at the same hole, such as drilling and reaming. If it is necessary to drill and then ream without disturbing the workpiece, two I.D. sizes of bushings are needed. A drill bushing and a reamer bushing may be interchanged in the same liner without affecting centering accuracy. For example, suppose you wish to produce a hole in a part which has a tolerance that cannot be achieved by just drilling. The hole first must be drilled and then reamed. In order to develop this hole the first operation would be to drill a hole allowing ample stock for reaming, using a slip renewable bushing as your guide. You would then remove this bushing and insert another slip renewable reamer bushing with the I.D. size of your reamer. Both bushings fit perfectly into the same liner in the fixture. The bushings are held in place by a lock screw fitted into a milled recess in the head of the bushing. Reamer bushings are priced as specials.
They also protect the hole in the jig plate from wear caused by frequent bushing replacement. These bushings are furnished finish-ground on the O.D. (Type L), or with grinding stock on the O.D. (Type LU) for customer fitting to his required size. Headless liners are used where almost no impact will occur on the head of the bushing.
In preparing a jig plate to receive a head liner, the jig plate is counterbored to bring the top of the bushing flush with the jig plate. This liner also is supplied finish-ground (Type HL) or with grinding stock (Type HLU). BUSHING KINDS AND WHEN TO USE THEM We have discussed various types of bushings. These types are available in many different kinds of bushing configurations. Those made by Economy Bushing Company are: ANSI STANDARD BUSHINGS These are the most commonly used bushings and conform to ANSI specifications. Generally, these are the most economical bushings. Refer to Page 3 for information on ANSI part numbers. ANSI EQUIVALENT BUSHINGS ANSI Equivalent bushings are identical to ANSI Standard bushings in every dimension except length. The ANSI Equivalent is the "in-between" size as far as length is concerned. In other words, it is a length in between each ANSI standard length. These bushings are priced as standards. Additional cost savings may be made by using a thinner jig plate. For example, because a 5/8" ECONOMY STANDARD LENGTH BUSHING is available, it is not necessary to go to the 3/4" ASA standard if only a 5/8" bushing is necessary. EXTENDED RANGE BUSHINGS In 1956, Economy Bushing Company originated the extended range bushing. Extended range bushings have larger O.D. ranges and lengths not covered by ANSI standards. These bushings are available in headless press fit, head press fit, and renewable types. Extended range liners are also available. X-TRA THINWALL BUSHINGS Designed specifically for use in applications where extremely close hole patterns must be drilled with great accuracy. Space is saved by reducing wall thickness and head diameter. Bushing ruggedness and service life are not impaired. These bushings are available in ANSI standard drill sizes. Other sizes are available on request. TUNGSTEN CARBIDE BUSHINGS Tungsten carbide bushings last up to 50 times longer than ordinary hardened steel bushings because of their Rockwell C hardness of 78-80, compared to standard bushing hardness of 58-62. The additional cost of these extremely hard, precision bushings is offset by their longer life and assurance of high accuracy over long production runs. These bushings also are available in ANSI standard drill bushing sizes. Economy Bushing Co. | Economy Power Trans. How to Select the RIGHT
Bushing | Bushing Catalog |
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Last updated: 12/10/01 01:41:43 PM |
