主电机可变频调速，以适应不同的切削力和钻孔速度。

The speed of main motor can be adjusted in variable frequency so as to adapt different cutting force and drilling speed.

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分析了影响牙轮钻机钻孔速度的主要因素，提出了钻机主要工作参数的确定方法。

This paper analyses the main factors that influence the speed of drilling hole, puts forward the methods to settle the main working parameters of the rotary drill.

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乐滩水电站I标工程帷幕灌浆工程量大，工期紧，影响施工速度的最大因素是钻孔速度。

Considering the large work quantity and tight time schedule for the curtain grouting in Bid I of Letan project, drilling speed is the most critical factor in the construction progress.

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