Measurements for a Bowman 234 front bogey

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Measurements for a Bowman 234 front bogey

RocDoc
Steam Legend!!
Joined: 16 Feb 2007, 11:15

13 Nov 2017, 15:54 #1

Hi everyone,

Bit of a long shot ... I was wondering if anyone could help provide some measurements for a front bogey of a Bowman 234 loco.  I have the wheels, axles and locking bolt but I'm missing the actual metal frame.  I plan to make a new frame from thick brass.  In the photo below I've highlighted the measurements that I need:

Thick black line: max. length and width of bogey
Thin red line: length and width of hole
Thick green line: thickness of bogey frame
Thin blue line: length and width of the wheel supports
Thin yellow line: length and width of the metal bit that goes on the locking bolt (is this a some sort of spring???)

Many thanks for your help

Pete
234-b3.PNG
234-b3.PNG
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Roly Williams
Honorary Life Member
Joined: 02 Aug 2006, 17:11

13 Nov 2017, 17:26 #2

Right. A bit tricky to measure without dismantling it but I managed (near enough).

Black = 61mm x 54mm
Red = 23mm x 5mm
Green = 2.2mm
Blue = 15mm x 16mm (tapering slightly to about 13mm at the end)
Yellow = 50mm x 13mm
Have Fun
Roly
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Roly Williams
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Joined: 02 Aug 2006, 17:11

13 Nov 2017, 17:30 #3

One thing to be aware of is that the weight of the engine sits on the bogie and rear axle. The middle axle hangs free and provides lateral location only. The two halves of the bogie frame are curved so that they slide over each other easily.
Have Fun
Roly
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RocDoc
Steam Legend!!
Joined: 16 Feb 2007, 11:15

13 Nov 2017, 19:20 #4

Roly Williams wrote: One thing to be aware of is that the weight of the engine sits on the bogie and rear axle. The middle axle hangs free and provides lateral location only. The two halves of the bogie frame are curved so that they slide over each other easily.
Hi Roly,

Thank you very much for the measurements.

Just trying to understand your last note about the two halves being curved.  Is the frame curved from side to side?  For example, when viewed from the front of the train, does the frame with the 4 bogey wheels have a convex shape with the upper half having the same shape?  Wonder if someone could post a photo.

Thanks

Pete
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Mamman
Forum Newbie
Joined: 22 Dec 2016, 09:36

13 Nov 2017, 20:27 #5

  
              The bogie frame is flat, but the central pivot has 2 'wings' that turn up giving about  3mm gap at each end. This stops them catching as it turns, and the wings stop too much roll as the engine goes around bends.  { usually at a hell of a speed !! ] DSCF5202.JPG DSCF5200.JPG
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RocDoc
Steam Legend!!
Joined: 16 Feb 2007, 11:15

13 Nov 2017, 22:11 #6

Many thanks for posting the photos Chris.  That is exactly what I was looking for 🤓

Cheers

Pete
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RocDoc
Steam Legend!!
Joined: 16 Feb 2007, 11:15

14 Nov 2017, 12:56 #7

Forgot to ask Chris ... would 2mm thick sheet brass be ok for the bogey frame or do you recommend mild steel?

Thanks

Pete
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Roly Williams
Honorary Life Member
Joined: 02 Aug 2006, 17:11

14 Nov 2017, 14:01 #8

RocDoc wrote: Forgot to ask Chris ... would 2mm thick sheet brass be ok for the bogey frame or do you recommend mild steel?

Thanks

Pete
The original is steel but I'm sure it doesn't need to be, apart from looks. 
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Roly
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Mamman
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Joined: 22 Dec 2016, 09:36

14 Nov 2017, 15:26 #9

RocDoc wrote: Forgot to ask Chris ... would 2mm thick sheet brass be ok for the bogey frame or do you recommend mild steel?

Thanks

Pete
 As Roly said, the original was steel, and having measured it, is approx 2mm.  I have bent  2mm mild steel using a vice and heavy steel strip to fold it over for replacement rail guards and front boiler support, which is easy, but the bogie is another kettle of fish. The bending has to be very accurate and square, or the bogie wheels will not sit on the track evenly. This is an art, and having made axle brackets for scratch built Bowman goods wagons I can't tell you how many attempts I made before getting it right !
The other problem is drilling the holes for the axles accurately  At first I measured them out and drilled before bending the steel.............big mistake. 

  Brass will be a lot easier, but I would reinforce the axle holes with steel plates or washers,because as it has been said earlier in the thread, the weight of the engine is on the bogies and rear wheels

                                 Chris.
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RocDoc
Steam Legend!!
Joined: 16 Feb 2007, 11:15

19 Nov 2017, 16:53 #10

Hi Chris,

Thank you for your very helpful comments. Brass it is 😀

I’ve noticed another thing which is a bit odd. My 234 doesn’t have a heat shield between the boiler and the chassis. I’ve scanned the web for images and most appear to have a heat shield. I wonder if mine was taken off and not replaced when it was repainted black.

Is the heat shield just a simple U-shaped bit of brass running the length of the boiler?

Cheers

Pete
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