PCB welding mode: Down with angle —up with angle –Up straight.
OB-S310 semi-automatic DIP soldering machine controlled by the motors to let the pin holder up and down. The difference between the right and left motors speed establishes the angle at which the PCB touch the solder surface.
Then both motors continue to move the holder downward, meantime the molten solder surface sweeps across the bottom of the PCB.
The angle larger, just need to larger the difference of two motors speed.
With angle is imitating the artificial welding, this is for the PCB THT welding.

Ok, now change another mode: Straight down and up!
One switch to control these two modes change, very convenient to operate. And adjust the speed of left and right motor the same.

This mode suitable for other material welding.Such as copper sheet,motor brush, laser diode…