[Cause]
The contact speeds of gun A and gun B differ. During synchronized motion to the pressure application position, the speeds of gun A and gun B must be equal.
[Countermeasure]
Make the contact speeds of both guns equal in the applied force conditions. The contact speed corresponding to the specified applied force is determined by the applied force adjustment results. The contact speeds must be the same for the applied forces of both guns. During applied force adjustment, make the applied force and contact speed adjustment results identical for both guns. However, torque adjustments may be specified separately for each gun. This error can also be avoided by specifying the same contact speed for all applied forces during applied force adjustment.