Marble Side-polishing Machines are structurally strong and simple to operate and maintain. The machine calibrates and polishes flat sides and makes upper and lower chamfers with various thicknesses. The machine has a conveying belt with speed that varies depending on the type of material being processed. Workpieces are clamped during the process by the electrically-powered pressure roller table. All electric and pneumatic controls are handy and accessible and permit excellent monitoring and control over all processing phases. The machine can be installed as a self-contained unit or inserted in a modular processing line.