锯切速度曲线是不可变的，但进给速度曲线随进给机构杆长比的不同而变化。
The sawing speed curve is unchangeable, but the feed speed curve can be different with different length ratio of members of the feeding mechanism.
如前所述，当依靠驱动大拖板的丝杆切削螺纹时轴向进给是自动产生的。
As previously mentioned, the axial feed is automatically generated when cutting a thread by means of the lead screw, which drives the carriage.
为了寻求合理的进给机构杆长比范围，建立了优化设计数学模型，并通过实例验证了该模型的可行性。
To pursue the proper length ratio range of the mechanism, an optimization design mathematic model is made and an example is taken to prove the feasibility of the model.
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