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在长期的教学实践中,我发现现行技校教材《钳工工艺学》(中国劳人社第二版,装配、维修分册。以下简称《钳工》)关于装配尺寸链中的增环与减环的判断方法不够简便,并且相应的文字、符号、公式表述也都有缺欠,教师教起来难,学生理解起来也难。于是我经过6年多的时间总结出了一种判断增环与减环的新方法——异同边法。我认为,该方法不仅十分简便易行,而且可克服书中方法的不足,使公式表述更为合理,既加强了公式的实用性,又方便了解题。书中方法及其不足
In the long-term teaching practice, I found that the current technical school textbook “Locksmith Technology” (China Workers Press Second Edition, Assembly, Maintenance Volume. Hereinafter referred to as “fitter”) on the assembly dimension chain ring and ring reduction judge The method is not simple enough, and the corresponding text, symbols, formula statements also have shortcomings, teachers teach it difficult, students understand it difficult. So after more than 6 years, I summed up a new method of judging the ring and ring reduction - difference and edge. In my opinion, this method is not only very simple and easy, but also can overcome the shortcomings of the book’s method, make the formulation of the formula more reasonable, both to strengthen the practicality of the formula, but also to facilitate the understanding of the problem. The book’s methods and their inadequacies