Padlock assembly machines automatically insert all bottom pins, top pins, and springs into a padlock body. After testing for proper parts load and successful rotation test, the pin holes are closed using either a cover or closing plugs. An LVDT key reader measures the key cuts to obtain the pinning information.  Alternately, the key codes may be obtained from a file. An operator manually loads the empty padlock and the cut key into the machine.  Assembled padlocks are automatically unloaded into a chute.