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Standard Class 3 tank in OO - frustration and irritation


Captain Kernow

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I've not had very much modelling time lately, for various reasons, and what time I have had, has been devoted to weathering the Bachmann chassis for 82044.

 

Tonight, I thought I would give it a good running-in on my circle of Lima track, which I keep specially for the purpose.

 

Prior to the start of running in, the chassis did exhibit signs of jerkiness, especially in one direction, but, ever the optimist, I hoped that this would improve with some running. However, after 90 minutes of continuous running in both directions, it hasn't improved one jot and after a while and with a bit of experience, you can start to tell which locos will improve with running in, and which won't.

 

Unfortunately, this chassis falls into the latter category. I even test ran a couple of examples in the shop when I bought it and chose the better of the two. I do try to buy R-T-R locos from a local shop, for precisely that reason, but any proprietor's patience is going to wear thin if I make him go through a dozen boxed locos until I find one I'm satisfied with.

 

This particular chassis will lollop along reasonably happily at a scale 40 - 50 mph, but when it comes to slower speeds, especially starting away or slowing to a stop, the jerkiness returns with a vengence.

 

As it happens, I have another Bachmann Standard 3 tank, and the chassis on that does run marginally better, but it's still far from perfect.

 

I had intended that 82044 would be a relatively quick loco to do, prior to some other jobs I want to do on 'Engine Wood' and it's rolling stock in time for Railex at Aylesbury this coming May.

 

So, what to do about it? I don't want to just pack it all up and 'walk away', because I really don't like leaving anything unfinished. I suppose I could dismantle the errant chassis and try to find the source of the tight spot or jerky running.

 

Alternatively I could use the chassis from the other example (which is destined to have a P4 chassis at some stage, anyway), but would have to start with the weathering all over again, and I can't guarantee at the moment that this one won't bed in to my satisfaction either.

 

On the other hand, I do have a Comet 76XXX chassis, plus a suitable motor and gearbox in stock, plus the right wheels, so I am now sorely tempted to build and modify that to fit the 82XXX.

 

I almost can't face dismantling the Bachmann R-T-R chassis. I know others have done it, but I feel that I would be better off spending the time building the brass chassis for the loco instead. I'll have to have a think about it.

 

I do wonder, though, why it is that so many of the Bachmann steam-outline R-T-R locos that I've bought in recent years are such indifferent runners, even after an attempt at running-in. I know we've had discussions like this on RMWeb before, yet it's just so frustrating when it happens again...

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Incredibly frustrating Tim; I hope that you come to a conclusion soon... perhaps with some help from here.. and that this gets the loco moving satisfactorily.

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I expect the coupling rods don't match the axle centres. Quite a simple modification, however, should we have to do this?

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If its any consolation Captain. My example (82020) out of the box, ran very lumpy, just prior to the motion disintegrating!!!!! :blink:

 

The replacement was much better :D

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I won't say finding the problem will be quick and easy Cap'n K, but in my experience the more recent products from Bachmann will come apart and go back together with much less hassle than they used to. Even the motion.

 

Good luck. I've a similar task on the WB, awaiting rare coincidence of willpower and free time.

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I know how you feel Tim. I check the quartering of every single one of mine as no two from the same running number are the same in some cases.

 

It might be worth giving this a try and also checking the return crank for lack of squareness? A pain in the bum of a job, but sometimes all you can do - being 17 spoke wheels (unique to the 3MTs), it's not going to be such an easy one. I have enough problems doing anything with an odd number of spokes like that!

 

I know we shouldn't have to do this on a recently produced model, but that's the price we pay I suppose? Keep us informed - it'll be nice to see 044 finished at Railex, fingers crossed! :)

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