Fixed drill bushing

Drill Bushings order to provide various types of non-standard drilling units, fixed drill sets, interchangeable drilling units, alloy drill sleeve, tungsten steel drill sleeve, adjustable sets, Morse taper drill sleeve sets and other processing. Part of the drill sleeve with the cash, cheap. Drill bushing size tolerances requirements: ① drill bit holder housing bore hole (also known as the guide hole) diameter of the basic dimensions of the tools used to be a maximum limit of size and a clearance fit shaft basis. When drilling or reaming tolerances take F7 or F8, when crude hinges take G7, when fine hinge take G6. If the drill guide sleeve guide column is part of the tool, you can press the corresponding mating hole basis of selection, such as H7 / f7, H7 / g6 or H6 / g5 and so on. ② length H drill guide sleeve length H orientation and action-oriented tool for large, H is large, the tool bit holder is not easy to deflect, but will speed up the tool and drill sleeve wear; H is too small, then drill oriented in a bad hole. The length of the guide is usually taken to its aperture ratio of H: H / d = 1 ~ 2.5. When high machining accuracy or machining smaller aperture, due less rigid drill bit used, the H / d value can be larger, such as hole diameter d