It will be seen that other advantages such as nominal tooling costs and very little operator training required will also result. The foregoing and other features and advantages of the present invention will be appreciated by workers as they become better understood through reference to the following detailed description of preferred embodiments which should be considered in conjunction with the accompanying drawings, wherein like reference symbols denote like elements. The following description of methods and associated fixtures is given by way of example to indicate preferred embodiment according to the invention.
Except as otherwise specified, workers should assume that conventional related methods, conditions, materials, etc. Workers in the art of making and using magnetic recording heads for digital data recording e. This invention is directed toward providing a means for better holding such a slider and also engaging it against a resilient lapping means, such as pad L-p of lapping wheel L-W shown schematically in FIG. In FIG. As workers know, such pads include a resilient elastomeric backing and an abrasive contact-face of prescribed lapping ability.
Here, it will be understood that a slider workpiece shown as SL has been engaged firmly by a holder or blending tool HC according to my invention, with tool HC being held at a prescribed orientation against peel-away pad L-p pressing-into it a prescribed amount to effect the corner-blending.
In this fashion it will be understood that the workpiece SL prescribed corners thereof is to be presented in prescribed angular relation with pad L-p so that the blending and lapping operation may produce a beveled surface with the same constant configuration and orientation each time the operation is performed. For this reason and according to one feature of the subject blending tool HC it will be seen that the tool is designed to present guide faces lg adapted to assist the operator in maintaining this angular relation between the slider and the lapping wheel.
Turning to FIGS. Both the gap g and the communicating cavity fc will be seen to extend across the entire cross section of rod R. Also, another feature is that this pocket is located so that the typical core legs, e. For this reason the metal used in rod R and the dimensions of gap g and cavity fc will be understood as adapted to provide sufficient flexibility so the prescribed parting means e. Thus, as here indicated in FIGS. Axle ec will be rotatable manually, by an attached handle h as known in the art and shown particularly in FIG.
Packing by Burroughs was terrible. The first unit I got was all apart with the dial off the meter. Aircraft Spruce sent out a new one right away and it was in good shape. Easy to use but cheap. Watch you. This tool is very fragile. It falls on the ground on first use. To find a place to fix it is an exploit. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base.
Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic. After you measure your cable, when you let go of the handle it will spin back to its starting position. So it does not hold a reading after you measure.
Quick Shop. Length Quantity. Both first and second shifts available. If you or someone you know is interested, please contact us. Our Specialists will help select shelving systems that meet both current and future storage needs:. It is with great pride that all of Borroughs products are made in Kalamazoo, Michigan. Because when a company chooses to do its work through local employees, it contributes to thriving communities.
We are Hiring! With a complement of accessories, Box Edge is a do all storage solution. More info Borroughs HD Drawers-in-Shelving Borroughs HD Drawers-in-Shelving are a fantastic product that combines the storage density of drawers with the large-item capacity of shelving. If a printed circuit board is damaged or becomes obsolete, it may be desirable to remove components for salvage, or if a component fails or is otherwise unsatisfactory, it may be desired to remove an individual component from the board.
The problem becomes particularly acute with the advent of multiple lead integrated circuit components which actually include many circuit elements in an individual package. Such individual packages of integrated circuits form the components soldered to the printed circuit board.
In one type of integrated circuit component which is widely used, 14 leads in two parallel rows of seven each are inserted through holes in a printed circuit board. These 14 leads protrude a short distance through the opposite side of a printed circuit board from the component package and are often clinched over at a small angle. The leads, whether or not clinched, are soldered to conductors on the printed circuit board for completing electrical circuits and also to provide mechanical strength.
The solder forms a principal mechanical attachment of the integrated circuit package to the printed circuit board. In other integrated circuit components, greater numbers and other arrangements of leads are provided for soldering through printed circuit boards in substantially the same manner. In the past, the removal of integrated circuit components from printed circuit boards has been very time consuming, and a substantial scrap rate due to damaged components has been encountered.
When such removal is effected in a manufacturing situation, special heating apparatus for heating the leads on one side of the board while removing the component on the other side may be employed. This is of importance since the solder on all of the leads must be melted at the same time in order to withdraw the component from the board without damage. In operations where it is desired to replace an integrated circuit component in the field, heating of the several leads while simultaneously lifting the component from the board, is a difficult and at times almost insurmountable task.
Damage to the components or the board or burning of the operator, are always substantial risks. It is, therefore, desirable to have a safe and reliable hand tool for removing integrated circuit components from a printed circuit board. DRAWINGS These and other features and advantages of the invention will be appreciated as the same becomes better understood by reference to the following detailed description of a presently preferred embodiment when considered in connection with the accompanying drawings, wherein: FIG.
Throughout the drawings, like numerals refer to like parts. As illustrated in this embodiment, a printed circuit board 10 has a plurality of integrated circuit components 11 mounted thereon.
Each of the components 11 has a row of leads 12 along each side, which leads are typically inserted through holes not shown in the printed circuit board and soldered thereto for use.
When it is desired to remove a component 11 from the board, a hand tool 13 is employed to grip the component, heat the leads to melt the solder, and lift the component from the board. The hand tool portion 13 is connected to a conventional power supply 14 by four leads 16 for conducting current to a pair of heated jaws of the hand tool 13, described in greater detail hereafter. The power supply 14 includes a rheostat or variable transformer 17 or the like, for controlling the power applied to the hand tool It has been found particularly useful to employ an ON-OFF foot switch 18 in connection with the power supply 14 so that the operator's hands are left free for manipulating the hand tool and printed circuit board.
The hand tool portion 13 is illustrated in a pair of orthogonal views, FIGS. Certain aspects of the hand tool are best seen in the bottom view of FIG. The hand tool 13 has a pair of insulated handles 19 interconnected at a pivot 21 so as to move towards and away from each other in the general manner of pliers or other similar gripping tools. A stop 22 in a slot not shown inhibits the handles 19 from spreading too far apart under the urging of a spring not shown , all of which is quite conventional.
An adjustable stud 23 prevents the handles 19 from coming too close together. Each of the handles 19 has a pair of metal rods 24, 24' extending from the forward or lower end thereof, with each of the rods in electrical connection with one of the leads 16 to the power supply.
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