A grinding or polishing machine (10) may include a working assembly (20) and a foldable cart (30). The working assembly (20) may include a grinding head (26) rotatable to engage a surface for grinding or polishing. The foldable cart (30) may be releasably coupled to the working assembly (20). The foldable cart (30) may include a mobility assembly (100) including at least one wheel (102) and a frame (104), and a handle assembly (110) operably coupled to the frame (104). The handle assembly (110) may include a first frame portion (112) and a second frame portion (114). The first frame portion (112) and the second frame portion (114) may be operably coupled to each other via a folding joint (120).