In this video I repair a worn out axle centre pivot.
The first job is to identify what the axle is made of, this is done by breaking a piece off and inspecting the crystal structure, a grind test to see the colour of the sparks and also by filing a little bit off and checking the filings. The decision was of cast iron.
The weld area was ground down ready to be welded. Super cast ultima rods were chosen as a filler material. The whole area was preheated and then the worn area was built back up again, the burner was left inside the casting as a post heat to cool the axle down slowly.
The axle was then moved over onto the milling machine where the boring head was used to turn the pivot down to 110mm. The top surface was also faced off.
A steel shelve was made in the lathe to be fitted over the pivot to bring the final size back up to the standard 120mm. The shelve was expended with heat and then shrunk on with 0.25mm interference fit. A small chamfer was put onto the new shelve to finish the job off.
Hope you enjoyed the video.
Thanks for watching.
7 сен 2024
