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在机械加工中,经常遇到铸、锻毛坯件或已加工孔的半成品画线,需画出中心十字线,求出圆心画圆,以确定加工孔的位置线和其它线。一般采用填料法,即用竹木块或铅、铜片紧固地安置在被画工件的孔中,并与孔的端面基本齐平。如品种多样,则较麻烦。下面介绍一种可调整定心圆规,其结构如附图所示。可调整定心圆规靠三个定位脚7,按120°均布顶住工件内孔壁,以达到自动定心。靠螺母8在主脚9上上下移动,可适应内孔直径。活动支脚10在主脚9的内孔中可上下滑动,以适应
In machining, often encountered casting, forging rough blank or processed hole semi-finished drawing line, need to draw the center cross line, find the circle drawn circle to determine the processing hole position line and other lines. Generally use packing method, that is, with bamboo block or lead, copper sheet tightly placed in the hole in the workpiece being drawn, and the hole is basically level with the end. Variety, such as more troublesome. The following describes an adjustable centering compass, the structure shown in the figure. Adjustable centering compasses by three positioning feet 7, press 120 ° uniform cloth to withstand the hole wall, in order to achieve automatic centering. By the nut 8 on the main foot 9 up and down movement, to adapt to the bore diameter. The movable leg 10 can slide up and down in the inner hole of the main leg 9 to be adapted