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Originally Posted by TheSilentChamber
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Actually peening introduces a compressive stress in the surface, this can prevent fatigue in high stress areas.
http://www.metalimprovement.com/shot_peening.php
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Originally Posted by GTmike400
I dont see why a blast cabinent wouldnt work. Basically all you're doing is shrinking the material by making it thicker. I think the only things to worry about are the feed hose/gun, and the window. A peen on that glass viewing window and its a new ligement on your face.
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Usually special equipment is needed.
There are essientially two types of peening machines; centrifugal and pneumatic. The basic principles of the pneumatic machine is similar to blasters, but the actual machine is much more complicated.
CNC Shot peening machine
Shot peening machine for crankshafts
A peening machine in action
http://www.webtraxs.com/dlcount.php?...tary lance.wmv