Sierra Leone Railway No. 85 - Replacement of the chimney

25 February 2007

Copyright © Geoff Gauntlett 2007

The chimney cap is a complex curved casting.
The drilling operation for the rivet holes was carried out in three stages
1) An end mill was used to create a flat area to drill into
2) A 13/32" hole was drilled
3) A counterbore was used to form a recess for the head of the rivet to sit in

The picture above shows the counterboring operation.