This student project of the Institute of Engineering Design (BIK) Institute of Mechanical Engineering (BIME) at the University of Bremen involves development of an NC-controlled gantry for use as a multi-function machine tool. This machine tool has three axes and the construction is a lightweight design.
The linear propulsion in the x-direction occurs via a gantry composite of two stepper motors that drive two trapezoidal threaded spindles. These are flanged on over the spindle bearing blocks available from igus®. Via plastic spindle nuts made of iglidur® J, which per side are each mounted on two drylin® T carriages, the rotational motion of the trapezoidal threaded spindles is converted into a linear motion. Movement of the y-axis is ensured through this structure. The fixture for infeed in the z-direction is mounted on this diagonal axis in the work space. Crossbar and advance are each moved with a trapezoidal threaded spindle, four carriages (drylin® T) that run on guide systems, and a step motor. This gantry is capable – through mounting of the appropriate tools – of executing simple milling tasks, measuring operations and 3D prints.