The CSLM is specifically designed to machine horizontal or near horizontal circular faces from 2 to 9 meters diameter (6.5 to 30ft).
The CSLM is relatively compact and fast to assemble on the work piece because it does not require large bearings and housings to support a rigid arm from the center of the work piece. Instead a milling head, rotating at the diameter to be machined is supported on wheels rolling on the surface being machined and connected by beams to a central pivot post.
The machine cuts a flat plane because the wheels are controlled to maintain the milling cutter in a level plane by referencing off a central ground datum ring, which has been set to the desired plane.
With the circular face cut flat, the machine can rotate on this face to machine any other part of the work piece using attachments such as machining vertical faces some meters below the horizontal face on which the machine rolls.