The coiled wire is spread on an arm provided with eccentric cams. 

The arm is rotated slowly during shot blasting. 

This movement has the effect of rotating the crown to present all the surfaces with shot jets.

The cams ensure, in addition, a vertical oscillating movement of the turns for a better homogeneity of work. 

Four families of machine: 

• 3800 mm arm and revolving door on vertical axis, 6 projection turbines. 
• 4000 mm arm and revolving door on horizontal axis (patented), 6 projection turbines.
• 5000 mm or 5500 mm arm and revolving door on horizontal axis (patented), 8 projection turbines. 
• 7000 mm arm and revolving door on horizontal axis (patented), 10 projection turbines.