Mainly explains the methods for fixture improvement and accurate grinding methods study and the measure for the control and elimination of the burr in the course of the vale spool's precision working.
着重论述阀芯在精密加工过程中变形的控制、研具改进、精密磨削方法研究以及加工毛刺的控制与清除等方面所做的探索工作。
This paper introduces the method of making sand core, explains the influence of the head design of sand core, assembly of sand core and other factors on the dimension precision of casting.
介绍了制芯方法，阐述了芯头设计、砂芯的组装及其它因素对铸件尺寸精度的影响。
His father was a watchmaker and his uncle a gunsmith, which probably explains his early interest in precision engineering and metalwork.
他的父亲是一名钟表匠，他的叔叔是一名军械工人，这或许可以解释为什么约翰·亚诺很早就对精密工程和金属制品产生了兴趣。
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