Construction of Class M7

1981 “BRUSH” diesel engine of Sri Lanka.

BOGIES CONSTRUCTION

This page shows the bogies construction of the M7 project.

If, looking at the previous pages you thought that things might be a little complicated or perhaps difficult then now you arrive at the real test! Making a pair of powered working bogies will require hundreds of parts making from scratch. Some parts can be purchased such as the 2 motors, the 8 double row bearings, the gearing, a combination of 4 gears per drive unit a slight modification will be required to at least one gear wheel that fits directly onto one of the wheels.. The 2 cogs and drive chain for powering the second axle of each bogie. The 8 CNC cut wheels, although some slight modification will be necessary to these.

Finding a batch of heavy springs that matched my needs was a problem but on a visit to a Exhibition I spotted a box under a bench with loads of odd springs in it, I needed 8 and found 12 that could have been specially made for me! That was a stroke of luck and I think they only cost me £10 for the lot.

Generally speaking you need to make at least 4 parts for most things, some need 8 whilst others require 16. Some might require left handed and right handed parts, so churning out 16 exactly the same could be problematic and a waste of time and material! Finding material that matches your requirements exactly may not be possible from local sources, however a few minutes spent carefully searching through a local engineering works scrap bin could deliver an off-cut that has been discarded. This could be used and cut down to obtain your special requirements and at minimal cost. There is however a down side in that it takes a lot of time cutting and machining off the surplus material!

Precision machining of parts with close attention to clearances and tolerances becomes a must, parts must fit squarely and not foul on an adjacent moving component thus inhibiting its movement or ability to function correctly. Parts should slide up and down easily or tilt where necessary without restriction to satisfy the design features that make it work. Parts might be interchangeable if very strict sizes are maintained during manufacture but quality does take more time to produce.

Each bogie will have to be capable of supporting about 50kilo of weight plus it will have to withstand the rigors of operating conditions on different tracks when used at different locations.

These have to perform faultlessly under arduous conditions as may be imposed by variable conditions and at the hands of the driver, experienced or a novice!



plan of bogies

8 of each item required

16 of these L shaped axle horns

8 equalising bars plus all the bits

note:

Assembling the parts just to see what fits etc can be frustrating especially when trying to hold heavy springs in place is problematic!

SLM7 – Bogies – stage. i

HOME PAGE                MAIN IMAGE MENU                 M7 INTRO PAGE

Chassis              Body             Cab             Bogie               Power(Mech)             Power(Elec)             Finish              Testing

This page shows the bogies construction of the M7 project. If, looking at the previous pages you thought that things might be a little complicated or perhaps difficult then now you arrive at the real test! Making a pair of powered working bogies will require hundreds of parts making from scratch. Some parts can be purchased such as the 2 motors, the 8 double row bearings, the gearing, a combination of 4 gears per drive unit a slight modification will be required to at least one gear wheel that fits directly onto one of the wheels.. The 2 cogs and drive chain for powering the second axle of each bogie. The 8 CNC cut wheels, although some slight modification will be necessary to these. Finding a batch of heavy springs that matched my needs was a problem but on a visit to a Exhibition I spotted a box under a bench with loads of odd springs in it, I needed 8 and found 12 that could have been specially made for me! That was a stroke of luck and I think they only cost me £10 for the lot. Generally speaking you need to make at least 4 parts for most things, some need 8 whilst others require 16. Some might require left handed and right handed parts, so churning out 16 exactly the same could be problematic and a waste of time and material! Finding material that matches your requirements exactly may not be possible from local sources, however a few minutes spent carefully searching through a local engineering works scrap bin could deliver an off-cut that has been discarded. This could be used and cut down to obtain your special requirements and at minimal cost. There is however a down side in that it takes a lot of time cutting and machining off the surplus material! Precision machining of parts with close attention to clearances and tolerances becomes a must, parts must fit squarely and not foul on an adjacent moving component thus inhibiting its movement or ability to function correctly. Parts should slide up and down easily or tilt where necessary without restriction to satisfy the design features that make it work. Parts might be interchangeable if very strict sizes are maintained during manufacture but quality does take more time to produce. Each bogie will have to be capable of supporting about 50kilo of weight plus it will have to withstand the rigors of operating conditions on different tracks when used at different locations. These have to perform faultlessly under arduous conditions as may be imposed by variable conditions and at the hands of the driver, experienced or a novice!	plan of bogies
	8 of each item required
	16 of these L shaped axle horns
	8 equalising bars plus all the bits note: Assembling the parts just to see what fits etc can be frustrating especially when trying to hold heavy springs in place is problematic!