Creep-feed grinding is characterized by increased depths of cut ae and much slower table speeds vw. With increased depth of cut ae, the length of the arc of contact lk increases exponentially, following a square root function ƒ (lk) = lk x (ae)1⁄2. (Doubling the depth of cut ae will increase the length of arc lk by √2.)
There are many advantages of creep-feed grinding over reciprocating grinding such as higher material removal rates, better form holding, etc. These, however, come at a price. There are much higher forces and temperatures at play than in recipro cating grinding. A creep-feed machine must be more rigid and powerful with spindle powers between 40 and 80kW (55 to 110hp) and higher. The high resulting temperatures must be counteracted with huge coolant supply units delivering volumes between 250 and 500l/min (65 to 135gallons/min) at 15bar (230psi.) pressures, or higher.