A Tandem Compound Mill Engine PART 11

Continued from p.96 M.E.4759 December 27 The cylinder end cover (fig 29) castings were pretty rough but once centred as well as possible in the four-jaw chuck they were centre drilled to allow tailstock support. That way, even if the chuck's grip isn't that secure, they can't work loose. In photo 179 the outer surfaces and the chucking spigot are being turned. With the turned spigot gripped in a collet the flange was brought to thickness and the cover turned to fit the bore (photo 180). The covers were drilled for the piston rod and the rear one counterbored to give the piston locknut somewhere to go at the rearward end of the stroke (photo 181). In the next three pictures, it's difficult to see but the chucking spigot is…

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Model Engineer (Digital) - 1 Issue, Issue 4760

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