A specially designed tool rotates the concrete angle while the machine polishes its curved surface. The angle can be blocked in a horizontal position allowing the machine to polish the flat surfaces for the entire length of the profile. The three beam-mounted spindles are positioned in robust cast-iron housings and are activated by a pair of pneumatic cylinders to ensure correct vertical spindle travel.
These spindles are pneumatically activated and the working pressure can be adjusted for each separate spindle. Each spindle is also fitted with special abrasive-holding heads and unidirectional shock absorbers.