Aluminium drum shell for combat robot
Body of a rotary drum to be used in a small fighting robot.
Preferably 7075 aluminium, 6082 aluminium if primary option unavailable.
80mm diameter, 100mm length.
30mm diameter hole through centre, bored out to 42mm at each end to a depth of 13mm.
4 M10 threaded holes in each end, 25mm deep and spaced at 90 degree intervals.
5mm deep x 20mm wide groove halfway along the drum's length.
Tolerance to +0.2mm is fine on all hole dimensions.