tjf4375 Posted August 29, 2017 Share Posted August 29, 2017 Hi all, Some of you may have already seen my ongoing Class 700 project on other forums here, as it is connected with my Sevenoaks layout and also involves a lot of 3d printing. I'm hoping people aren't getting sick to death of hearing about it! At the risk of annoying people any further, I was after a bit of advice on wheel sets - this is my first foray into the world of rolling stock scratch building so it is proving a steep learning curve (albeit an enjoyable one). Any modern image southern region modellers will be familiar with the Class 700's distinctive bogie arrangement which lacks side frames. When it comes to building bogies this poses some interesting challenges, not least the fact that no one seems to sell wheel sets with flush axles - they are all of the pinpoint type, designed to click into side frames. To illustrate, here is a picture of the real thing: And here a pic of the bogie design I hope to use for the model. I have established that 10.5mm wheel sets are extremely close for what I need (10.8 would be precisely to scale). However I've had serious trouble finding someone who makes these with flush axles (as opposed to the pinpoint type). I'm suspecting I might be out of luck as there are so few stock types that require them, and even fewer modellers who are daft enough to embark on a scratch build project. Nevertheless I thought I'd ask on here on the off chance! The last time I asked about something I couldn't find, someone came back with the answer in about 10 minutes which was incredible! All the best, Tim Link to post Share on other sites More sharing options...
brack Posted August 29, 2017 Share Posted August 29, 2017 If you buy a piercing saw and 4/0 blades you can cut the axle ends off any wheels you want in about 3 minutes. Alternatively, Jackson romford 10.5mm inside bearing wheels are available from several places. I've found they pickup power a lot better if you polish the blackening off the treads. https://www.railsofsheffield.com/10-5mm-disc-wheels-inside-bearing-jc6-romford-mashima-branchlines-JJJA15898.aspx http://www.holtmodelrailways.co.uk/choose_00.php?gauge=00&product_type=15&company= Link to post Share on other sites More sharing options...
RMweb Gold chris p bacon Posted August 29, 2017 RMweb Gold Share Posted August 29, 2017 If you think about steam locomotives, the pony trucks don't have outside bearings, although I'm not sure where you get a disc wheel like that.......I model pre-grouping. Link to post Share on other sites More sharing options...
tjf4375 Posted August 29, 2017 Author Share Posted August 29, 2017 Very useful, thanks Brack - I think the Jackson-Romford sets might be what I'm looking for. Sorry to sound daft but what does 'inside bearing' mean exactly? Link to post Share on other sites More sharing options...
micklner Posted August 29, 2017 Share Posted August 29, 2017 Gibson come with flat/stub axles ends. Inside bearing means the bearing is inside as is the running surface of the axle !! Link to post Share on other sites More sharing options...
tjf4375 Posted August 29, 2017 Author Share Posted August 29, 2017 Gibson come with flat/stub axles ends. Inside bearing means the bearing is inside as is the running surface of the axle !! Thanks, but I've been in contact with Gibson already, and they don't have what I need - at 10.5mm their disc wheels come on pinpoint axles only. Appreciate the info though, cheers! 1 Link to post Share on other sites More sharing options...
tjf4375 Posted August 29, 2017 Author Share Posted August 29, 2017 If you think about steam locomotives, the pony trucks don't have outside bearings, although I'm not sure where you get a disc wheel like that.......I model pre-grouping. Yes, but as you say they would be spoked wheels, and in any case I suspect most pony truck wheels would be too small a diameter for what I need. Therein lies the problem. For the moment I've ordered some Jackson-Romford sets as mentioned by Brack, to see if they fit the bill. If not it's back to the drawing board! I like the user name by the way, that made me laugh! I like thinking of authors of book titles, such as "The Importance of Punctuality" by Justin Thyme. Or "Road Safety" by Deborah Crossing. 1 Link to post Share on other sites More sharing options...
brack Posted August 29, 2017 Share Posted August 29, 2017 They should be fine, I use them as driving wheels on 9mm gauge in o scale. Inside bearing means the bearings are inside the wheels, or in other words, axle end is flush with the wheel. Link to post Share on other sites More sharing options...
298 Posted August 29, 2017 Share Posted August 29, 2017 (edited) What is the wheelbase that you need? I don't have one to hand to measure the wb of, but the Bachmann HO scale 70 tonner has 10.5mm wheels and inside bearings. Fortunately Bachmann supplied most of the spares from this design in a readily available chassis....in the form of an Underground Ernie tube train model.... Edited August 29, 2017 by 298 Link to post Share on other sites More sharing options...
tjf4375 Posted August 29, 2017 Author Share Posted August 29, 2017 Great, many thanks Brack. Sounds like they'll do the job. Once the parts arrive from Shapeways I'll start a scratchbuilding thread to show the progress of how I'm getting on - not least because I suspect I will need a lot more help! Link to post Share on other sites More sharing options...
tjf4375 Posted August 29, 2017 Author Share Posted August 29, 2017 What is the wheelbase that you need? I don't have one to hand to measure the wb of, but the Bachmann HO scale 70 tonner has 10.5mm wheels and inside bearings. Fortunately Bachmann supplied most of the spares from this design in a readily available chassis....in the form of an Underground Ernie tube train model.... Mmmm.... interesting. Scale wheelbase is 28.9mm, which happens to be ludicrously close to one of the Tenshodo chassis offerings of 28.7mm. I'm open to any and all options at this stage, the emphasis being on cost! Link to post Share on other sites More sharing options...
298 Posted August 29, 2017 Share Posted August 29, 2017 Mmmm.... interesting. Scale wheelbase is 28.9mm, which happens to be ludicrously close to one of the Tenshodo chassis offerings of 28.7mm. I'm open to any and all options at this stage, the emphasis being on cost! Unfortunately the Underground Ernie chassis wb is around 23mm, there might be a larger HO American diesel with the necessary wb but this may also mean it has 40" wheels, around 11.3mm. I hope you find an easy answer soon. Link to post Share on other sites More sharing options...
D51 Posted August 30, 2017 Share Posted August 30, 2017 Markits do 10.5mm disc wheels in solid nickel-silver as well as blackened brass. They are available with 20mm long axles for inside bearings. Frank Link to post Share on other sites More sharing options...
RMweb Gold Bucoops Posted September 1, 2017 RMweb Gold Share Posted September 1, 2017 Markits supply whatever axle you want Link to post Share on other sites More sharing options...
tjf4375 Posted September 1, 2017 Author Share Posted September 1, 2017 Markits supply whatever axle you want Indeed, I can see they supply a lot of stuff! Half the problem is not knowing exactly what I do want, and not really being able to see whether the product does what I need it to do without actually ordering it. Not having much experience of locomotive/rolling stock scratch building means it's a process of trial and error! I've ordered some Romford wheelsets with inside bearings, which hopefully will do the trick but if not it'll be back to the drawing board! Link to post Share on other sites More sharing options...
RMweb Gold Bucoops Posted September 1, 2017 RMweb Gold Share Posted September 1, 2017 I have struggled with communication with Markits - initially very helpful with emails but then when I wanted to order it all went quiet. Got there eventually though. Link to post Share on other sites More sharing options...
tjf4375 Posted September 1, 2017 Author Share Posted September 1, 2017 Funnily enough I had a kind of similar experience with Gibsons - they emailed back straight away to start with and were very helpful, but when I got back to them to order a couple of bits they seemed a lot less willing to help and almost curt when they eventually did get back to me. I don't really understand it at all. In any case I've ordered the Romford wheels from Holt Model Railways instead. 1 Link to post Share on other sites More sharing options...
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