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.
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.įurthermore, 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 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. Vw Line Bore Tool Portable And Suitableįurthermore, 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.Ĭonventional field boring bars for this purpose usually mount a single tool bit within a slot in the boring bar itself.Ĭonsequently, the boring bar must be axially repositioned during the boring operation for each main bearing bore.
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