Lathe Boring

Machining process to finish existing holes to exact size (rough cast holes or previously machined)

Assures accuracy of hole location (concentricity)

Produces smooth finish requiring little or no further machining

Can produce tapered holes

Boreing tool

Tool location at or just above center line. Produces finer finish

Bore diameter controlled by cross feed movement

Compound is “locked”

Tool design and machining requirements

Small nose radius Cutting tool doesnt rub part below cutting edge Bar as large and rigid as possible Minimum tool overhang As heavy a cut as possible

Rough and Finish

Roughing – quickly removes excess metal, leaving coarse finish

Finishing – lighter cuts and slower feed rate, gives better surface finish and accurate bore

Feed direction

Feeding in – Roughing work, 'loads' the tool. Heavier cuts

Feeding out – lighter cuts. Reduces tool spring

This evening:

Boring operation in aluminum.

Inspection using transfer measurement and calipers.