Bending machine pressure instability is how to search for things
The first pressure you must be in the corner when the object to do the pressure, rather than empty machinery to do pressure, the second pressure must be enough time, do not pointer in place you extract.
First of all depends on your pressure and pressure time, I do not know how big your bending machine, do not know how much you should hold the pressure but can be divided into three points.
This pressure is actually normal, you do not worry, just the way you pressure the wrong.
Upstairs to the landlord of the problem made it wrong, people asked why there is a change in the work of pressure.
