Sheet glass production method

The end-face processing step of the method comprises a position control step for controlling, by means of a control device (5), the position of a processing tool (2). The position control step includes: a preparation step (S1) for placing the processing tool (2) at a reference position (RP) before the processing tool (2) is brought into contact with an end surface (ES) prior to the initiation of processing; a measurement step (S2) for measuring the amount of displacement (D) of the processing tool (2) in an approaching direction (CDa), or in a separation direction (CDb), as the processing tool(2) is brought into contact with the end surface (ES) when initiating the processing; and a correction step (S4) for setting, on the basis of the displacement amount (D), the reference position (RP)of the processing tool (2) for the next round of processing. 本方法的端面加工工序包括利用控制装置(5)对加工工具(2)的位置进行控制的位置控制工序。位置控制工序包括：准备工序(S1)，在该准备工序(S1)中，在加工开始前且加工工具(2)与端面(ES)接触之前，将加工工具(2)配置于基准位置(RP)；测定工序(S2)，在该测定工序(S2)中，在开始加工时，对加工工具(2)与端面(ES)接触