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Bachmann diesel bogie mod, sorting out the rocking 'AWD' problem!

craigwelsh

Entry posted by craigwelsh

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On Friday at the Bluebell 50th I was moaning to Richard from Bachmann about their banana shaped bogies that were really bad news in P4. Some of mine are bad enough that they still rock on the gear after the bearing holes are filed back.

 

Richard however pointed out a fairly easy mod you can do to get around this problem and he'd done it to his P4 locos. It turns the drive into an A-1-A arrangement but this is perfectly acceptable in my Heljan Western so I have no problem doing it to 37 and 47 classes from Bachmann!

 

As supplied the drive chain goes via the central axle to the inner axle. You need to transfer drive to that inner axle still.

blogentry-174-128165227101_thumb.jpg

 

Luckily there is a hole up in the tower of a perfect size to take the gear from the middle axle once it has been filed back to the thickness of just the gear. Its a perfect fit for it and you can get away with it working well without an axle for the gear to run on. I'll probably fit one at some stage though.

blogentry-174-128165227755_thumb.jpg

 

Any issues now with the central axle and I can spring the bearings if I wish with a tab and some wire through handrail knobs.

 

A simple solution to an annoying problem I had holding up my projects :). I may in the future go down the Brian Hanson coil sprung route but until the kit is out this will do nicely!

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ClikC

Oooh, thats a bit cunning isn't it! Almost like someone had it in mind all along...

 

I seam to have been rather lucky with my first Bachy 47, which is dead flat across both bogies. Nice to know for the future.

 

Likewise I'm looking forward to the Coil sprung bogies from Brian, I keep telling him he should forget all the detailing gubbins and just get some coils commissioned ;) Just a pity the Bachmann AWD co bogie doesn't lend it'self well to adding springs, the Hornby design on the other hand...

 

Regards

 

Matt

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Horsetan
Oooh, thats a bit cunning isn't it! Almost like someone had it in mind all along...

 

....Likewise I'm looking forward to the Coil sprung bogies from Brian......

 

Coil springs have so many useful applications (he said, looking at the start of his no-holds-barred ProtoDeltic).....

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iak

Coiled what?

AM I missing out on something here?

Mind that is a canny solution B)

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ClikC
Coiled what?

AM I missing out on something here?

Mind that is a canny solution cool.gif

 

Coil springs for the purpose of springing Diesel bogies.

 

Brian has been assessing the Hornby english electric equilised bogie for the idea of fitting full working coil suspension, ala a certain well known 4-mm scale Deltic...

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Guest jim s-w

Guest jim s-w

Posted

Hi Craig

 

What bogie is this? I have had a look at my bachy 47 but cant see how you get the bogie apart to get inside to fit the relocated gear.

 

Cheers

 

Jim

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craigwelsh

Hi Craig

 

What bogie is this? I have had a look at my bachy 47 but cant see how you get the bogie apart to get inside to fit the relocated gear.

 

Cheers

Jim

Its one of the original release 47s with the 57 underframe. Mine now has a D1500 body as opposed to the FYE body I swapped with Pixie.

 

I removed one of the axles of the idler gears then took that gear out and that allows room to put the old gear up into the hole. You need to file down the plastic from each side of the gear before it can be pushed in. This plastic was to take out the slop when fitted to the axle.

 

I didn't take an intermediate stage picture with the idler gear out but would take it apart again to do so if you want?

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Guest jim s-w

Guest jim s-w

Posted

Hi Craig

 

No need - I just wondered if there was a way of taking the bogie apart. So the gear is just loose then?

 

Cheers

 

Jim

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craigwelsh

Hi Craig

No need - I just wondered if there was a way of taking the bogie apart. So the gear is just loose then?

 

Cheers

Jim

I think they heat weld the two halves together during assembly though you could take them apart if you really wanted to. Probably better to replace the whole thing with brass though if you were going to do anything serious.

 

Yes currently just loose though its a really snug fit in the hole and the plastic is quite soft stuff anyway. I did try drilling the shaft but got the pilot slightly off so i'll leave getting it correct for now!

 

I'll spend some time on it when I eventually P4 it but its the 37's this is most applicable to for me.

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