Machacek has toured as the Austrian Trio with bassist Raphael Preuschl and drummer Herbert Pirker. They have collaborated with Mario Lackner. In 2007, he was a founding member of UKZ with Eddie Jobson and Trey Gunn. He has also played in Planet X, which toured in Greece and Armenia in November 2008, and with the Virgil Donati Band. Machacek has taught at the Musicians Institute in Los Angeles. Machacek played with Brand X on the Cruise to the Edge 2019. Machacek is currently the substitute guitarist for John Goodsall of Brand X for all tours outside of the US. Machacek occasionally plays with the fusion band CAB led by bassist Bunny Brunel & Scott Kinsey former keyboardist from the fusion band Tribal Tech.