Quote Originally Posted by Max
i know i said i would either buy a co2 bottle or get a proffesional to make one but it does seem quite expensive so i was wondering if i could make a buffer tank by welding a disk onto both ends of a bit of aluminium pipe and then welding ports on both ends,
It is possible,done that in the past, got the Tshirt. But the flat ends are annoyingly heavy. Especialy if there is a hole in them for treads. The thickness of a flat end is at least trice the wall thickeness. That is why industrial tanks have round ends, stronger and lighter (and therefor cheaper) than flat end tanks.

If you're willing to sponsor me to buy or build a machine that can do this, all the roboteers troubles to get a fitting buffertank can be called history.