* Secondly the pop-up pins are equipped with aluminum slots along Y axis, when the machine used the pushing function the slots will rise up as a tank on the table surface so that the positioning surface is big enough to stop the smalls pieces falling off the machine.
* Thirdly all pop-up pins are installed with adjustable air pipe connectors, so all cylinders rise up or fall down at same time , this design won't break the cylinders due to over air pressure and non-working because of short of air pressure.