Line boring excavator bracket. Offsetting holes to change pin centres.

Bit of a learning curve and bit of a training exercise with the newly made line boring machine, line boring and changing the pin centres on an excavator bracket.

Firstly, I made some offset pin washers that allow me to line the bars to the right pin centres. They are tacked into the holes and then the bars are slid through. The bearings mounts are welded into position.
After pre cutting the first holes, I decided to do the second holes differently.
I gouged out a few mm of metal at the tops and bottoms of all 4 holes where the weld material crosses over into the base material, this ensures a good thick layer of weld at the cross over.
I then bore welder the side of the holes to build up enough to cut out the new hole.
I then line bored all 4 holes.
A third pin hole was then wanted by the customer at 380mm pin centres. After roughly gas cutting where the new holes needed to be, the line bore was once again, set up and holes cut to sizes.
Last job was to drill the holes for the retaining bolts for the pins.


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