PORTABLE LINE BORING BAR ASSEMBLY. BACKGROUND OF THE INVENTION One or more of the crankshaft main bearing bores in the block of an engine frequently become worn or axially misaligned due to warpage from heat distortion or the like which requires that the engine be torn down for repair. The crankshaft bores are individually partially formed by a semi- circular bearing saddle integrally cast and machined within the block with the saddle having a semi- circular machined bearing cap releasably fitted thereto so as to define a cylindrical bore. Presently, the factory provides fully finished precision replacement caps for those caps that have experienced some type of failure, distortion or other malformation such as having become scored or otherwise worn to the point of impairing proper engine operation. Such caps are adjusted in the field by the use of shims which is a tedious, time- consuming job. Furthermore, true concentricity of the bores cannot always be accurately re- established by this method nor precise axial alignment of any particular bore with its adjacent bearing bores even if true cylindricality of each bearing bore is obtained. Conventional field boring bars for this purpose usually mount a single tool bit within a slot in the boring bar itself. ![]() Consequently, the boring bar must be axially repositioned during the boring operation for each main bearing bore. The tool bit has to be tediously set for each cut through the individual bearing bores with a micrometer after installation of the boring bar in its desired central position within the existing bores of the block. This operation is extremely difficult accurately and conveniently to accomplish in view of the relatively small space afforded within the block adjacent to the main bearing bores. Furthermore, such conventional bars are required to be of a sufficiently large diameter rigidly to hold the tool bit to prevent chatter and the like so that the weight thereof is extremely difficult to be handled by a single workman. The only other line boring machine presently available accommodates the entire block which is similar to the machine employed during initial manufacture of the block which is too cumbersome and expensive for use in the field. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an improved line boring bar assembly. Portable Line Boring Equipment and bore welders to repair heavy construction equipment by American Machine Tools Company. Machine Shopper – Cylinder Boring. Porta-Draulic: PORTA TOOL: $2,500: PK-447S Cylinder Boring Machine: PETERSON: $6,950: Copyright . MWA Machine Company Inc. Find best value and selection for your Kent Moore Porta Tool Line Boring Bar VW Barely USED search on eBay. World's leading marketplace. Find best value and selection for your Porta Tool 2 Inch Line Bore Bar and Bushing Kwik Way search on eBay. World's leading marketplace. ![]() Mactech portable line boring machines make on-site boring operations faster and easier. Our portable line boring eqp. Groz Tools manufactures Manufacturers of lubrication. HOME > PRECISION ENGINEERING TOOLS > MACHINE TOOL ACCESSORIES > BORING BARS SQUARE. Suitable for bar size. Kent-Moore Porta-Tool PT-2210-A is designed for cleaning up and recutting counterbore ledges when shims are required to obtain correct liner protrusion. Another object is to provide such an assembly that is portable. Another object is to provide such an improved portable line boring bar assembly for in- line boring the main bearing bores of engines. Another object is to provide an improved portable line boring bar assembly of the character described which is relatively lightweight, simply constructed, and economically manufactured. Another object is to provide an improved portable line boring bar assembly which can be conveniently employed in the field. Another object is to provide an improved portable line boring bar assembly which permits the use of semi- finished bearing caps which are easily and conveniently finish- bored in assembly upon the bearing saddles of an engine block. Another object is to provide an improved portable line boring bar assembly which is ideally suited for boring one or a plurality of main bearing bores in an engine block with a single set- up of the boring bar on the block, thus obviating the inaccuracies, inconveniences, lost time and expenses of repetitious re- setting operations. Another object is to provide an improved portable in- line boring bar assembly which utilizes an elongated boring bar adapted to be rotatably driven at one of its ends by a conventional electric drill and positively axially driven at its opposite end by an hydraulic feeding device mountable on the block. Another object is to provide an improved portable in- line boring bar assembly in which said drive devices are selectively connectable at either end of the boring bar. Other objects and advantages of the present invention will subsequently become more clearly apparent upon refernece to the following description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1, showing the in- line boring bar assembly of the present invention in side elevation. FIG. 4 is a somewhat enlarged transverse vertical section through the block and in- line boring assembly, taken on line 4- -4 of FIG. FIGS. 1 and 2 shown in clamping relation about the boring bar of the present invention. FIG. 1, showing the cutter bit holder in side elevation. 5 Hand of Tool Right hand Neutral Left hand R N L. T135 Manufacturer’s Type Designation 8 Tool Length (inch) 6 Shank Height 7. I was surprised to see negative postings about the Porta-Tool Mainliner. I am 60 years old and have been a machinist/mechanic all my life. I started rebuilding VW. The York 4-14 ET (electric touch) portable line-boring machine is our finest yet. Proven dependable and extremely powerful. Shown below with the Fein 4 speed. FIGS. DESCRIPTION OF THE PREFERRED EMBODIMENT Referring more particularly to the drawings, a portable in- line boring bar assembly embodying the principles of the present invention is generally indicated by the reference numeral 1. The engine block is of conventional construction and is shown in an inverted position to present its lower surface or pan rail 1. The block has a plurality of semi- circular integrally cast bearing saddles 1. A corresponding number of semi- circular bearing caps 1. After removal of the bearing caps 1. On the other hand, such warpage of the block or damage to the bearing caps may be so severe that all the bores require reworking. In either instance, the present invention is ideally suited for the task. The repair of the main bearing bores 1. ![]() The boring bar includes opposite ends 2. A pair of annular centering rings 3. Each of the centering rings has a circular aperture 3. The boring bar assembly 1. However, the embodiments of the present invention are also readily adapted to be provided in various sizes including a relatively small boring bar assembly for the relatively small engines utilized in Volkswagen automobiles and the like. As best shown in FIGS. The upper end includes a pair of diametrically opposed outwardly extended pins 4. An annular bearing 5. The bearing has an upwardly extended tab 5. The bearing further includes a pair of clamping pads 5. The bearing mounting posts 4. The opposite ends of the bridging member include elongated bolting slots 6. A transverse bore 6. A locking setscrew 7. The boring bar assembly 1. As best shown in FIGS. Pairs of outwardly extended assembly flanges 7. The tool mounting portion 7. A conventional carbide- tipped tool bit 8. The boring bar 2. A universal coupling adapter 9. The adapter has an end 9. The adapter includes an opposite end 9. The boring bar 2. Such feeding devie is substantially similar to that employed with the boring tool of my prior U. S. 3,3. 31,2. 66 to which attention is directed for a full description of its internal mechanism and operation. Briefly, however, in its present use, the hydraulic feeding device provides an elongated cylindrical body 1. The hydraulic feeding device is adapted to be rigidly mounted on one end of the engine block 1. The mounting frame 1. The bar provides an elongated rod 1. The feeding device has an arm radially extended therefrom providing a sleeve 1. A thumbscrew 1. 14 is screw- threadably received in the sleeve for tightly clamping the feeding device on the rod 1. The hydraulic feeding device is adapted axially to drive the boring bar in either direction by extension or retraction of the connector 1. OPERATION The operation of the described embodiment of the subject invention is believed to be clearly apparent and is briefly summarized at this point. Prior to extension of the boring bar 2. The salvagable bearing caps are replaced on the bearing bores not requiring attention while new semi- finished bearing caps are utilized on those bores requiring the reworking operation. When, however, the end bearings are required to be re- bored, the centering rings can be disposed in any of the selected inboard main boring bores in sufficiently spaced relation to afford the necessary stability to insure precise centering of the boring bar through the bores in the engine block. After installation of the centering rings 3. The boring bar is also extended through a second upright bearing assembly adjacent to the opposite end of the block and through the centering ring 3. The bridging members 6. The bridging member is rotated slightly about the mounting post in order to dispose it in a plane substantially normal to the axis of the boring bar so as angularly to misalign the slots 6. Accordingly, in the event that the boring bar is inadvertently removed from the block, the upright bearing assemblies 4. The lock bolts 7. At this point, the centering rings may remain in their initially installed positions or removed from the block, as desired. Such removal may be necessary in instances where the main bearing bore in which they were disposed is required to be reworked. In any event, the tool bit holders 7. The electric drill 9. Upon energization of the hydraulic feeding device and the electric drill, the tool bit 8. While only one or two of the main bearing bores usually require re- boring, it is apparent that a sufficient number of the tool bit holders 7. However, if there should be insufficient clearance to the left of the main bearing bores to permit the bore to be fully finished by the tool bit 8. FIG. In view of the foregoing, it is readily apparent that the structure of the present invention provides an improved portable in- line boring bar assembly which enables the main bearing bores of an engine block easily and conveniently to be re- bored in precise axial alignment and individually returned to precise cylindrically and concentricity. The boring bar assembly of the present invention utilizes a conventional electric drill as a rotary drive member and a known hydraulic axial feeding device which is borne by the engine block so that such in- line boring operation can be successfully accurately accomplished in the field. Such assembly enables the use of semi- finished bearing caps which are accurately finished after installation into the engine block so as to provide a custom assembly with their associated main bearing saddles to re- establish the same optimum tolerances as initially provided by the factory.
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