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 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.