Armin Bijanzad 10th.week unanswered

1.Metal surface repairs

many metal cracks can be permanently repaired.Those that can not be permanent can carry on until new parts can be obtained.Examples of repairable parts are: pump casting,valve bodies,oil pans and their covers,bearing housing, and gear boxes.The following directions should be followed:
-Clean and degrease the crack area
-Drill holes 1/8 inch langer than the crack at both ends of the crack
-İf the crack is long, drill additional holes to relieve the stress within the crack
-Use the V point of a drill on the outer edge of the crack to V out the entire length of the crack.This will provide more surface area for the epoxy to take hold.
-Use a spatula to force the material deep into the crack and overlap the crack up to 1 inch at both ends.
-Where great strength is required, a piece of reinforceing material could be used over the patch.Push it into the patch and cover it with additional epoxy.
(Advanced machining technology handbook JAMES BROWN P.255)


2.Honing against a faceplate


İf the short-bore part has one face that is flat and perpendicular to the bore, install a face plate on the machine and hone while pressing the flat surface against the faceplate.
(Advanced machining technology handbook JAMES BROWN P.157)