Rail-Online Posted November 21, 2013 Share Posted November 21, 2013 Peter Chrichtons video has left me seriously underwhelmed with this 2-4-2T now though. Off-centre driving wheels have not gone down well. Not just you Larry! The crew would soon declaire that one unfit for work -even before the days of health & Safety! Serious question for everyone who has one -is this a one off or are eccentric wheels a common problem? Tony Tony Link to post Share on other sites More sharing options...
Miss Prism Posted November 21, 2013 Share Posted November 21, 2013 (edited) Peter Chrichtons video has left me seriously underwhelmed with this 2-4-2T now though. Off-centre driving wheels have not gone down well. Pitching is always a possibility with rigid 2-axle drivers and lightly sprung carrying axles fore and aft. Sprung drivers would help 'absorb' wheel eccentricities, although at the risk of making the tractive weight far more problematic. Edited November 21, 2013 by Miss Prism Link to post Share on other sites More sharing options...
alfsboy Posted November 21, 2013 Share Posted November 21, 2013 I checked my one and the wheels do grind the rail slightly when I run it by my usual method of testing ie a finger stuck in front while running fast to see how much wobble .no wobble but something is just a tad out of true to make that noise .It doesnt while running without the finger stuck in front !!!.Really scientific testing in this house no cheapskate rollers .:-) Link to post Share on other sites More sharing options...
Adams442T Posted November 21, 2013 Share Posted November 21, 2013 Mine seems to run OK, but as I'm re-wheeling it to EM I'm not too worried, apart from sourcing correct size (& spokes!) of course! Link to post Share on other sites More sharing options...
coachmann Posted November 21, 2013 Share Posted November 21, 2013 Pitching is always a possibility with rigid 2-axle drivers and lightly sprung carrying axles fore and aft. Sprung drivers would help 'absorb' wheel eccentricities, although at the risk of making the tractive weight far more problematic. With respect, this has now't to do with pitching, which is something one encounters when running if the leading carrying wheels aren't doing their job properly. I was referring to the up and down movement of the loco where the rotary motion of the driving wheels is not concentric. Link to post Share on other sites More sharing options...
coachmann Posted November 21, 2013 Share Posted November 21, 2013 Mine seems to run OK, but as I'm re-wheeling it to EM I'm not too worried, apart from sourcing correct size (& spokes!) of course! Having never re-wheeled a Bachmann loco, what exactly is involved in re-wheeling one say using Romford/Markit driving wheels? For instance, are the axles 1/8" and is the gear wheel re-used off the Bachmann axle? Thanks in advance. Link to post Share on other sites More sharing options...
RMweb Gold Savoyard Posted November 21, 2013 RMweb Gold Share Posted November 21, 2013 My sound fitted loco will be on the Digitrains stand on Sunday at Warley if you want to hear it in the flesh metal plastic so to speak. The project will be available to buy on a Zimo sound decoder from them, it is not my project I was the beta tester for the friend who built it. Link to post Share on other sites More sharing options...
Miss Prism Posted November 21, 2013 Share Posted November 21, 2013 With respect, this has now't to do with pitching, which is something one encounters when running if the leading carrying wheels aren't doing their job properly. I was referring to the up and down movement of the loco where the rotary motion of the driving wheels is not concentric. Yes, I can see the distinction you're making, Coach, but in this case we have an eccentric driver(s) and the carrying wheels not carrying as much weight as the prototype did (for understandable model tractive reasons), so the overall effect (the pitching) amounts to the same. Link to post Share on other sites More sharing options...
coachmann Posted November 21, 2013 Share Posted November 21, 2013 Yes, I can see the distinction you're making, Coach, but in this case we have an eccentric driver(s) and the carrying wheels not carrying as much weight as the prototype did (for understandable model tractive reasons), so the overall effect (the pitching) amounts to the same. The loco is on rollers so it wouldn't matter if the non-carrying wheels were absent altogether. It is NOT pitching........I guess you havent seen it. Link to post Share on other sites More sharing options...
bluebottle Posted November 21, 2013 Share Posted November 21, 2013 (edited) I'd never even thought about these terms being applied to a locomotive, but I think that were it a boat you'd say it was pitching and rolling - look at the motion of the cab handrails. Would one eccentric driver produce that effect? Edited November 21, 2013 by bluebottle Link to post Share on other sites More sharing options...
Mike Riley Posted November 21, 2013 Share Posted November 21, 2013 Coachman asks about rewheeling Bachmanns with Markit wheels. Bachmann normally have 3mm axles which are available to fit Markit wheels. And refit the Bachmann gear wheel. But strange axle diameters have appeared recently on some rtr. For example 2mm on the Hornby T9 when Hornby have previously used 1/8" axles. Mike Link to post Share on other sites More sharing options...
Michael Delamar Posted November 21, 2013 Share Posted November 21, 2013 The roller wheels might be off centre Link to post Share on other sites More sharing options...
neal Posted November 21, 2013 Share Posted November 21, 2013 Or these could be oscillations caused by the water slopping in the tanks and scale springing to the driving wheel axles! Still waiting for my order to be 'fulfilled', N 2 Link to post Share on other sites More sharing options...
RMweb Gold The Stationmaster Posted November 21, 2013 RMweb Gold Share Posted November 21, 2013 I'd never even thought about these terms being applied to a locomotive, but I think that were it a boat you'd say it was pitching and rolling - look at the motion of the cab handrails. Would one eccentric driver produce that effect? You clearly have never ridden through the pre 1967 layout at Friars Jcn on a Brush Type 4 - where the term 'rolling' was something of an understatement (but it was quite alright on a Hymek). 1 Link to post Share on other sites More sharing options...
Adams442T Posted November 21, 2013 Share Posted November 21, 2013 Coachman asks about rewheeling Bachmanns with Markit wheels. Bachmann normally have 3mm axles which are available to fit Markit wheels. And refit the Bachmann gear wheel. But strange axle diameters have appeared recently on some rtr. For example 2mm on the Hornby T9 when Hornby have previously used 1/8" axles. Mike Yes Mike, they usually do have. Haven't investigated this one yet, but I'm sure I can find something to fit it! In some ways kit and scratchbuilding is so much easier..................... Link to post Share on other sites More sharing options...
Guest spet0114 Posted November 21, 2013 Share Posted November 21, 2013 Picked up mine from the post office this evening - stunning model! CheersAdrian Link to post Share on other sites More sharing options...
APOLLO Posted November 21, 2013 Share Posted November 21, 2013 (edited) The loco is on rollers so it wouldn't matter if the non-carrying wheels were absent altogether. It is NOT pitching........I guess you havent seen it. In Wigan (L&Y) speak it would not be either oscillating or pitching, it would either be "Urching" (small movement) or "Thrutching" (big movement). !! Brit 15 (The Brits Glided !!) Edited November 21, 2013 by APOLLO Link to post Share on other sites More sharing options...
micklner Posted November 21, 2013 Share Posted November 21, 2013 Rocking on rolling roads is not unusual. All of mine do it, rtr or kit built when running in .Never had the problem on track presumably something to do with static postion and "hanging" in mid air perhaps ?. Link to post Share on other sites More sharing options...
pete55 Posted November 21, 2013 Share Posted November 21, 2013 (edited) Mike Riley, on 21 Nov 2013 - 16:15, said: Coachman asks about rewheeling Bachmanns with Markit wheels. Bachmann normally have 3mm axles which are available to fit Markit wheels. And refit the Bachmann gear wheel. But strange axle diameters have appeared recently on some rtr. For example 2mm on the Hornby T9 when Hornby have previously used 1/8" axles. Mike Hold on there!! All Bachmann steam loco releases from the 3F have 2.14mm diameter axles........Markits are not an option as they do not do the correct diameter axles. Hornby still use 3mm in their current releases from the rebuilt Merchant Navy, up to and including the recent Star....the T9 being the only odd one as you point out. If it is a loco with 3mm axles......then yes, Markits wheels are an option. Mine has not arrived yet.....but I would be surprised if it had anything but 2.14mm axles and the separate brass bushes. The Alan Gibson website has (under the "Downloads" heading) PDF guides on re wheeling several recent r-t-r locos. Pictures and notes. Hope that helps. Edited November 21, 2013 by pete55 Link to post Share on other sites More sharing options...
Mike Riley Posted November 22, 2013 Share Posted November 22, 2013 Thanks, Pete, for updating me on axle sizes. It struck me that 2.12mm is an odd dimension. It equates to 1/12". Maybe just coincidence. Link to post Share on other sites More sharing options...
Miss Prism Posted November 22, 2013 Share Posted November 22, 2013 2.14mm diameter mild steel is very weird, but since it is only about 600 dollars a ton on the Chinese surplus markets, Kader seems to have bought a shedload. Link to post Share on other sites More sharing options...
RMweb Gold Tim Hall Posted November 23, 2013 RMweb Gold Share Posted November 23, 2013 Just opened mine, runs beautifully (admittedly only on 6 yards of straight track) and romped away with 4 Mk1s. Just hope Mrs H forgets its supposed to be for Dec 25th 1 Link to post Share on other sites More sharing options...
pete55 Posted November 24, 2013 Share Posted November 24, 2013 Hold on there!! All Bachmann steam loco releases from the 3F have 2.14mm diameter axles........Markits are not an option as they do not do the correct diameter axles. Hornby still use 3mm in their current releases from the rebuilt Merchant Navy, up to and including the recent Star....the T9 being the only odd one as you point out. If it is a loco with 3mm axles......then yes, Markits wheels are an option. Mine has not arrived yet.....but I would be surprised if it had anything but 2.14mm axles and the separate brass bushes. The Alan Gibson website has (under the "Downloads" heading) PDF guides on re wheeling several recent r-t-r locos. Pictures and notes. Hope that helps. Ok, well that was the danger of making predictions! Having got my hands on one at Warley, and persuaded the owner to let me borrow it Saturday night, I took it apart in the hotel room, and surprise, its on 3mm diameter axles running it very neat brass bearings. Wonder if this means Bachmann have returned to 3mm diameter as their future standard. Also discovered the leading and trailing wheels pick up as well as all four driving wheels. One wheel of each of the radial axles is live to its axle, one side at the front and t'other side at the rear, and passes the current to the main pick up strips in the keeper plate....a very neat arrangement. Oh, and if you decide to remove the keeper plate....beware.....the radial truck springs can fly out! Many thanks to Bob Blood for allowing me to discover this! Link to post Share on other sites More sharing options...
coachmann Posted November 24, 2013 Share Posted November 24, 2013 Now that's what I call useful information Pete. No stalling on those Insulfrogs then. Link to post Share on other sites More sharing options...
Billystanier Posted November 25, 2013 Share Posted November 25, 2013 (edited) 1008 now appears to have sold out at NRM and the carpet-bagging Ebay prices have started. http://www.ebay.co.uk/itm/Bachmann-L-YR-Tank-1008-NRM-Exclusive-31-165NRM-BNIB-00-Gauge-DCC-Ready-/221324259592?pt=UK_Trains_Railway_Models&hash=item3387f43108 Edited November 25, 2013 by Billystanier Link to post Share on other sites More sharing options...
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