25/05/2026
We’ve been looking at our bearings at Gayle Mill recently. Most of the bearings are simple split plain bearings like these, and some of them are showing some significant signs of wear. They’ve been in there for up to 140 years so I suppose it’s understandable…
Several of our volunteers have investigated this at quiet times, and we seemed to be seeing inconsistent results. One of us would try a spare bearing and say that it would fit, then somebody else would say it doesn’t fit. Confusion all round!
We finally identified the cause of the confusion last week. The main drive shaft is in three parts, and each part is a different diameter! The shaft at the turbine is 2 1/8”. The shaft going along the mill under the floor is 2”. The length in between is not any standard diameter known to mankind, it measures at 54.3mm which is not a standard size in either metric or imperial measurements!
We’re probably going to have to replace some of these bearings soon - the wear is quite visible in the pictures, maybe 2mm or so. For now, though, while we work out what to do, we’re thinking we may start greasing them rather than oiling them - oil just runs straight out onto the floor but hopefully heavy grease will stay in there better.
Gayle Mill is open on Thursdays from 10am until 4pm with guided tours every hour on the hour from 10am until 3pm.