The opening will accommodate sewing machines no larger then 22-9/16 wide x 11-3/4 front to back (deep) x 14-1/2 tall. The cabinet dimensions: Open: 84 w x 39-3/4 d x 30-1/2 h (quilt leaf fully extended) Closed: 43 1/2 w x 22 3/4 d x 31 1/2 h