The boundary layer of air rotating with the grinding wheel can result in fluid starvation in the contact region. The boundary layer acts a barrier to fluid penetration and prevents fluid reaching the contact region and the fluid is deflected elsewhere. Such a situation is inefficient and wasteful. This work reports on an investigation of the air boundary layer aimed at increasing understanding of boundary layer for development of improved fluid delivery systems. The work reported focuses on the outcomes of experimental tests using the Laser Doppler Anemometry technique. Three velocity components of the air flow around the periphery of a rotating grinding wheel were measured for a range of wheel speeds. The contour distribution of the velocity and the turbulent distribution of velocity clearly show the air flow motion around the grinding wheel.