Abstract
The influences of guide pad length of a BTA tool, a longitudinal groove on a rake face of a gun drill and additional rear guide pads of a BTA tool on axial hole deviation are examined. Two new tools to reduce the axial hole deviation are designed, and one of them is produced and used in the experiment to examine the effects. As a result, the following are clarified. The guide pad length is little related to the hole deviation. The longitudinal groove on a rake face of a gun drill reduces the axial hole deviation. The additional rear guide pads of a BTA tool reduce the axial hole deviation. Three rear guide pads are more effective than four in improving hole accuracy. As the new BTA tool is complex in shape and difficult to produce, sufficient accuracy in shape could not be obtained. Therefore, the desired effect that the axial hole deviation is reduced by this tool was not apparent.
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