Help us build the Front Bogie
The front bogie of a steam locomotive is a 4 wheel, unbraked truck. It's job is to carry the weight of the front of the locomotive and control the entry into and out of curves. The building of the bogie is the next stage of building Hengist after initial frame assembly is complete. In order to build the bogie, we will need to procure the following components.
The photo above shows the front bogie from 71000 Duke of Gloucester in a partially stripped condition. The central slide can be seen - the pipes are grease feeds from the grease nipples on the left side of the bogie stretcher. The axlebox guides and their manganese steel liners can be seen. The side check gear spring is just visible.
The manufacture of the bogie will be broken into 3 phases :
- Phase 1 - Manufacture of the bogie frame and side check gear.
- Phase 2 - Manufacture of the axles, axle cannon boxes and fitting of tyres to wheels. Assembly of the wheels and axles.
- Phase 3 - Manufacture of the springs and spring cradle. Installation of lubrication system.
For phase 1 of the bogie construction we are aiming to complete the bogie frame and its associated components. We have a number of components in stock and a number of components are being manufactured.
Click on the images below for a larger pictures.
|Bogie Stretcher Casting|
|The bogie stretcher casting is the central 'skeleton' within the bogie upon which everything else is built. The 2 round areas are where the bogie bolsters engage; these carry the weight of the front of the loco. The central area is where the centre slide is located.
The part will be cast in a foundry and then will be taken to a machining shop for machining - these are the grey areas on the drawing
Status - Order placed for pattern manufacture and casting
|Bogie Centre Slide|
|A pivot pin fastened to the underside of the locomotive frames engages with the central hole of the centre slide. The centre slide has the ability to move left and right on the stretcher casting but is restrained by centering springs. This ensures that when a locomotive enters a curve, the forces on the bogie wheel flanges are kept within limits. It also ensures that the loco is recentred after leaving a curve.
The slide is a casting which will require machining after casting.
Status - Order placed for pattern manufacture and casting
|A bush is required in the centre slide which the centre pivot engages in - Manufacture - £80
2 wearing plates are required for the central slide to operate on - £100 each
4 bolts are required for the plates - £25 each
|These are the spring pads that sit between the bogie stretcher and the central buckle on the leaf springs. The "pip" on the left hand pad is welded into the arm on the bogie frame stretcher.
Status - In stock
|Bogie Side Check gear|
|On the front and back of the bogie, there is the side check gear. This controls the movement of the bogie centre slide. For a full explanation of what is involved here, take a look at the bogie pages in the build section.|
|To complete the side gear, we need :
2 off Distance Pieces @ £82 each - the orange item. The inner ends of the spring rest here
4 off Spring Guides @ £450 each - the fawn item. The outer ends of the springs rest here
4 off Stops @ £52 each - the fawn item. These locate spring guide in the yellow beam arms
At the moment the design is not finalised in this area so we are not currently seeking sponsors for these items.
|Beams - Centre Slide to Side Check Gear|
|The Centre Slide must be restrained in movement by the Side Check Gear and the springs. 2 substantial beams connect the 2 components. The beams (yellow in the drawing) are fitted in slots in the centre slide. As the centre slide tries to move, it moves the beam which compresses 2 of the springs (one fore, one aft)
2 off Beams @ £275 each
Status - sponsored
|The pivot is bolted to the underside of the main frames into the Frame Stretcher for Bogie Pivot. This pivot then engages with the centre slide on the bogie.
|Pivot Collar and Locking Ring|
|Once the pivot on the locomotive frames has been engaged with the centre slide of the bogie, a 2 halves of a pivot collar are fitted and then a locking ring secures the pivot collar. These are fitted underneath the centre slide to prevent the bogie from disengaging with the pivot. There are 2 components
|Here are the components part way through manufacture. Top is the locking ring. Middle are the 2 halves of the pivot collar that engage in a slot on the bogie pivot. Bottom is the securing bolt|
|2 bogie frames are bolted to each side of the central stretcher. These will require final machining and drilling for the various bolt holes and fixing holes
2 off bogie frames - In Stock
Frame machining and drilling, costs £TBD
Status - A CAD drawing is currently being created to assist with machining.
|Bogie Frame Stays|
|The front and rear of the frames are braced in position by 2 frame stays, 1 forward, 1 aft.
2 off bogie frame stays - In Stock
These require machining, costs £550 per stay
Status - Machining complete. In inspection.
8 axlebox guides are bolted to the bogie frames. These will allow the axleboxes to move vertically within the guides. Manganese Steel liners are bolted to the face of the guides and is the rubbing face for the axleboxes. Manganese steel is very hard wearing.
|Bogie Bolster Cups
2 bogie bolsters fitted on either side of the main frames at the front of the loco transfer the weight to the bogie via these bogie bolster cups. These are free to "float" on the top of brass pads fixed to the bogie stretcher casting
|Here are the completed bogie bolster cups. The right hand one is upside down and and, originally, a Ferobestos pad was fitted in the recess. This will be replaced by a Tufcot pad (in stock) that has similar charateristics to Ferobestos but without the asbestos. The Ferobestos/Tufcot pad provides a dgree of damping.|
In 1959 to 1960, most of the Clans were fitted with BR Automatic Warning System. You can tell if it has been fitted by the presence of a protection plate behind the screw coupling on the front drawhook. Part of the installation was a new fabricated reciever stay as seen here between the lifeguards on 71000's front bogie (photo courtesy Michael Hughes from the BR Class 8 Steam Locomotive Trust). We will not be procuring the central joggled plate yet. Almost certainly, we will need to mount other signalling detection systems here such a TPWS so we will leave that decision until later. You could sponsor the stay for £660 or a monthly standing order of £55.
Status - in stock
Phase 2 tackles the wheels and axles. The axle and cannon boxes need to be manufactured. Tyres will be fitted to the wheels. Finally, the axles will be fitted to the cannon boxes and then the wheels will be pressed onto the axles. This work will be expensive and will need be contracted to an approved rail accredited supplier.
Phase 3 is the final phase and will involve the manufacture of the spring cradle and procurement of the leaf springs. The final task will be the installation of the bogie lubrication system. Oil for the centre slide and grease for the axle box guide liners.