In this paper, the length of arc of contact during the plunge cut grinding process with a surface grinder is studied. The actual value of this length is 20-30% bigger than the theoretical value which has been used in surface grinding process up to the present. Moreover, this arc length increases relative, to an increase of grinding force. It seems that this phenomena occur due to the fact that the wheel and the work deform elastically in the grinding process. Under the assumption that the quantities of the elastic deformation near the contact are is found using Hertz's static contact models the following relation is obtained:
ls={DG(t+δ2)}1/2+(DG·δ2)1/2
where ls; length of arc of contact
t ; depth of cut
δ2 ; quantities of elastic deformation
DG; wheel diameter
The computated values seemed in coincidence with the experimental ones in this experiments.