It describes the STEP-NC data model based on the extension of step, introduces some major concepts like manufacturing feature and working step, overviews the data model for milling.
首先简要介绍了STEP - NC数据模型与STEP的关系以及制造特征、工步等主要概念，概括了铣削模型的基本结构和组织方式。
The basic structure design of the left and right step face milling cutter with carbide circular inserts is briefly introduced, amplify on the cutter parameter of geometry and structure.
介绍了装有硬质合金圆刀片的左右阶梯端铣刀的基本结构，对其几何参数和结构参数作了进一步分析。
The first step, because the river entities seeper, milling equipments must float on water work, need USES the steel plate made floating bodies, plate thickness of 3.5-4 mm.
第一步，因为河道里存有积水，选矿设备必须要浮在水面上工作，需要用钢板做成浮体，钢板厚度为3.5 - 4毫米。
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