So, in this video I repair both stub shafts in a roller out of a flail mower.
With the shafts been so badly worn, the first job is to dismantle the remains of the bearings to measure the ID. Once the size is determined the old shaft can be removed from the roller end. This is done by arc air gouging the welds away.
Once the old shaft is out, I made the decision to bore the hole out to 40mm so a bigger shaft with a shoulder for the bearing to run against can be fitted. This will stop the roller shifting from side to side causing wear to the shafts.
The new shafts are made in the lathe.
After working out the measurements needed between the shoulders on the shaft, the first shaft is preheated and welded into the roller end.
The roller is then set up on bearings so that it can be rotated to check alignment and to weld. The end is then tacked into positions and aligned to an accepted amount of run out. The root weld was done with the tig welder, mainly just for me to have a practice in a realworld situation but also to get good penetration. The second weld was done with the mig.
After the first end was done, the second end was removed with the arc air gouger and the old shaft was chopped off then drilled and bored through on the lathe.
The same process was then repeated to weld the end on.

Hope you enjoyed the video.
Thanks for watching!


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