In this video I repair 2 broken JCB TM310/320 headstocks. A poor design has resulted in these centre ayes having a very common failure point.
New heavier duty ones are firstly flame cut out of 25mm plates on the CNC cutting table. The old ones are cut off with the plasma cutter using the new jig I made to ensure they’re cut off at the right angle and height. Once cleaned up with the grinder, the new plates then need a bolt hole drilled and tapped and also a bevel cut for welding preparation.
They are then tacked into position with run off plates and a brace across the top to stop them splaying out when welding. The joint and surrounding area is preheated then welded up.

The new ayes then need line boring, another jig is made using the milling machine to drill holes at a set distance apart and the some bushes are made in the lathe to go in the main pivot pin holes.
The jig makes it a lot easier to set the boring bar up at the right centres from the main pivot pin.
The line borer (does anyone actually read this?) is set up and the holes are bored out to size, the same process in then reported on the second headstock.

Hope you enjoyed the video.
Thanks for watching!