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Pulp and Paper Mill - Wood Preparation Area
 Introduction:
The 144" Nicholson Chipper weighs 33 tonne and, as
the name implies, creates wood chips out of logs fed in through
the disc face.
Problem: Bearing Journal damage. The bearing had spun
on the shaft causing major damage with up to 5mm deep scouring.
Solution: The repairs were carried out in-situ using
a dummy bearing to rotate the chipper via a hydraulic drive.
The operator could control the speed of rotation for pre-machining
and during the deposit of the Arcsprayed Aluminium Bronze
coating. The coating was then machine finished to original
size.
Results: Removing the old shaft and manufacturing
a new one was not required. By repairing in-situ, a special
crane was not required to remove the unit. (The photo on the
right was taken during another operation). Turn around time
for the job was three days, compared to at least 14 days if
traditional methods of repair had been used.
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