![]() Important drilling factor is speed, constant bias life-span and the constant feeding life-span of drill bit.The speed of having been found that is subjected to the influence of the unbearabling thickness of working end.Equally, found that speed also is subjected to the influence of the helix length of drill bit.Have been found that the constant bias life-span is subjected to the influence of the unbearabling thickness of drill bit working end.In addition, the constant feeding life-span increases with the taper thickness of shank junction.Therefore, in the test of drill bit, have been found that and be that opposite parameter provides extraordinary result for existing drill bit in hand-held drill or the parameter fixedly used on the drilling machine.Correspondingly, drill bit of the present utility model provides a kind of and not only can be used on the hand-held drill but also can be used on single drill bit on the fixing drilling machine.This drill bit all provides outstanding result in two kinds of application, need not use different drill bits in two kinds of application thus. Y10T408/9095- Having peripherally spaced cutting edges with axially extending relief channel.Y10T408/909- Having peripherally spaced cutting edges.Y10T408/78- Tool of specific diverse material.Y10T408/00- Cutting by use of rotating axially moving tool.Y10T- TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION.Y10- TECHNICAL SUBJECTS COVERED BY FORMER USPC.Y- GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS AND DIGESTS.chip conveying grooves with decreasing depth in a direction towards the shank from the tool tip B23B2251/241- Cross sections of the diameter of the drill.B23B2251/24- Overall form of drilling tools.B23B2251/18- Configuration of the drill point.B23B2251/00- Details of tools for drilling machines. ![]()
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