Perseus
Perseus is a BIG 7¼” gauge locomotive based on the Tinkerbell class locos.
The frames are 72" long and this class stands alone (almost) as the driver rides
on the loco rather than a riding truck. My client has done a
remarkable job putting together the frames, plate-work and running gear in a
small garage with minimal facilities. However, when it came to design
and machining motion and cylinders he contacted me to speed things along!
Perseus is being built to work hard on the
Moors Valley Railway. There are many modifications from
the Tinkerbell design - larger cylinders and
Walschaerts valve gear as well as a loco style boiler. A considerable amount of CAD development
and valve motion simulation has been
necessary to get the motion just right. The CAD data will be re-used to drive the CNC mill
when that parts are made as well as providing profiles for laser cutting of
profiles.
Perseus is now in
service and I hope to add photos of the official naming ceremony in
the near future,,,
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Cylinder Maching |
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The steam chest attachments are drilled and then tapped on the CNC mill. The automatic tapping head is a remarkable device - 10 M6 holes are taopped in under 2 minutes! |
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Substantial frames |
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Perseus' frames on the building stand in the work give an idea of the size of the loco! |
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Machined cylinders |
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- assembled with the steam chests and front covers in place. |
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Cylinder |
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CAD model is used for optimising cylinder components and ensuring they fit together as required! |
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Walschearts valve gear |
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getting the hi-tec treatment. The motion of components can be analysed and refined before any metal is cut. |
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The expansion link assembled on it's carrier |
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The completed cylinder and motion. |
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