End Plate Machining

In preparation to machine the diameter of the end plates, the center holes needed to be re-drilled so they would be as perpendicular to the face as possible. To accomplish this, the end plates were set up on 1-2-3 blocks in the mill/drill and clamped down. Using a 3/8" end mill, the center hole was re-drilled. By using an end mill, the bit would end up being reluctant to follow the previous hole as a normal HSS drill bit would have a tendency to flex and walk. It was also OK to use a normal end mill because the hole already existed. Otherwise, a proper center cutting end mill would need to be used if there was no hole but at that point, a normal drill bit would be better.