When the curvature of the bent tempered glass produced shows large errors after long-term use of the bending section.

When there is a significant difference in the radius of curvature between the inner and outer arcs of the same piece of glass or the arc is not smooth ;

When there is a significant difference in the radius of curvature between the inner and outer arcs of glass within the same batch or the arc is not smooth；

After any repair of the arc motor encoder in the bending section of the glass tempering furnace.

After any repair of the arc-adjusting mechanism or arc-forming mechanism of the bending section.

After disassembly or repair of the chain links of the arc-adjusting mechanism in the bending section of the glass tempering machine.