Timber Posted May 19, 2022 Share Posted May 19, 2022 This thread will document the building of the above engine. This is still work in progress but hopefully by starting this thread it will motivate me to finish the build. I am trying to achieve a few things here: Add to my collection of S Scale Brecon and Merthyr locomotives, the B&M had three of these locomotives Make a locomotive that can be taken straight off the 3D printer and built in a few hours Make a more sophisticated engine that has an integrated etched frame. So this is where I am up to, I have a working prototype that has a few defects: Cab dimensions are wrong so have now been corrected The connecting rods are binding in forward, the engine runs nicely in reverse but binding (slightly) when going forward, 6 1 1 Link to post Share on other sites More sharing options...
Timber Posted May 19, 2022 Author Share Posted May 19, 2022 (edited) This is by far the most complex piece of Fusion 360 work I have attempted and I have learnt a massive amount in the process. I have tried to keep the build structured into components, have constrained everything that I can constrain and added comments so that I can remember how the drawing is created. That said I have still struggled with the stability of the design. This is not a failing in Fusion 360, it is simply my design evolving, sometimes not in the most ellegate way. Where possible I have gone back and simplified sections but at some point I will go through the whole design end to end and reorder some of the construction. This is the latest design that I plan to print over the weekend, Edited May 20, 2022 by Timber 2 Link to post Share on other sites More sharing options...
Timber Posted May 19, 2022 Author Share Posted May 19, 2022 2 Link to post Share on other sites More sharing options...
Timber Posted May 19, 2022 Author Share Posted May 19, 2022 2 Link to post Share on other sites More sharing options...
Timber Posted May 19, 2022 Author Share Posted May 19, 2022 2 Link to post Share on other sites More sharing options...
Timber Posted May 19, 2022 Author Share Posted May 19, 2022 3 1 Link to post Share on other sites More sharing options...
Timber Posted May 19, 2022 Author Share Posted May 19, 2022 Once I have a stable model that works I will post the STLs in the thread so that others can reuse, 3 Link to post Share on other sites More sharing options...
Rob R Posted May 19, 2022 Share Posted May 19, 2022 That is looking great. I can't wait to get one (or two) on the printer. Rob Link to post Share on other sites More sharing options...
Timber Posted May 23, 2022 Author Share Posted May 23, 2022 (edited) 3D prints were an improvement. I have located the binding problem to the connecting rods .....once i have a working model I will go back and try and improve the print quality. But for now better to build something and find all the snags than keep messing around with the print. Edited May 24, 2022 by Timber 7 Link to post Share on other sites More sharing options...
Timber Posted May 23, 2022 Author Share Posted May 23, 2022 The connecting rods are modified to fix the binding issue. Once proven I will send for a fresh set, Push on now to fit some of the more detailing. 4 Link to post Share on other sites More sharing options...
Timber Posted May 23, 2022 Author Share Posted May 23, 2022 (edited) Edited May 23, 2022 by Timber 6 Link to post Share on other sites More sharing options...
Timber Posted May 24, 2022 Author Share Posted May 24, 2022 (edited) Started to add some details this evening... Edited May 24, 2022 by Timber 5 Link to post Share on other sites More sharing options...
Timber Posted May 24, 2022 Author Share Posted May 24, 2022 (edited) The motor is accessed via the saddle, it is now a clip fit. Edited May 24, 2022 by Timber 5 Link to post Share on other sites More sharing options...
Timber Posted May 24, 2022 Author Share Posted May 24, 2022 Waiting on new etches for the connecting rods and to print some new wheel centres . Originally I had a simple compensation system but took this feature out to help get to the bottom of what was causing the binding. Once the new connecting rods are proven I will reintroduce the compensation. That said the engine runs well on a fixed chassis, the EM profile Ultrascale wheels seem to work well. 7 Link to post Share on other sites More sharing options...
Rosedale Posted June 3, 2022 Share Posted June 3, 2022 This is the first time that I have been able to get on RMWeb since you sent me some photos of the completed prototype and it is absolutely brilliant, a triumph of complex design. I certainly want one of these for Blakey, to become the Farndale Iron Company's shunter bringing in ironstone and potash wagons from the Farndale mines. I will probably also build one for the 5'3" as they did get over to Ireland as contractor's engines. Please keep us all posted about progress. 1 Link to post Share on other sites More sharing options...
Timber Posted June 4, 2022 Author Share Posted June 4, 2022 (edited) Thank you Rosedale. I now have the connecting rods sorted and have been advised by one of our more experienced 3D printing members to try the green water washable resin. It is amazing. Almost too good as it is highlighting some errors in my artwork. On this model I have opened out the front and rear bearings so that there is a little bit of vertical play downwards. A small spring wire above will offer some simple compensation. The resin is really hard - I cannot imagine an axle wearing this out any time soon. Tomorrow I will print the version for the metal chassis. Edited June 4, 2022 by Timber 4 Link to post Share on other sites More sharing options...
Timber Posted June 4, 2022 Author Share Posted June 4, 2022 Another member asked me about the chimney. There appeared to be a number of differenty chimney types. This is the one I am copying. Maybe on my model the bottom collar is too high and the top too low. I will adjust for the next print, 3 Link to post Share on other sites More sharing options...
WayneKennerley Posted June 5, 2022 Share Posted June 5, 2022 that is looking really good Link to post Share on other sites More sharing options...
drduncan Posted June 5, 2022 Share Posted June 5, 2022 Very impressive. I’m trying to do something similar for GWR broad gauge locos. Out of interest what resin are you using? Duncan Link to post Share on other sites More sharing options...
Timber Posted June 5, 2022 Author Share Posted June 5, 2022 Thank you - This is the resin https://www.amazon.co.uk/ELEGOO-Washable-Printer-Translucent-Fast-Curing/dp/B08T19DTYS/ref=sr_1_5?crid=LO72CKHU295R&keywords=elegoo%2Bresin%2Bgreen&qid=1654446413&sprefix=elegoo%2Bresin%2Bgree%2Caps%2C65&sr=8-5&th=1 1 Link to post Share on other sites More sharing options...
Rob R Posted June 5, 2022 Share Posted June 5, 2022 (edited) I am using the same resin in my Mars 2 Pro. Print settings are the default settings as set by Chitubox (which match the Elegoo recommended settings on their website) with the exception of the exposure time for the bottom layers which I have reduced from 35 seconds to 15 seconds and 0.03mm layer size. This morning's print of APL13's LNWR Dia 16 Brake Van. The layer lines disappear under the first coat of paint, they are more visible because of the transclucent resin. Rob Timber, Are you putting the rivets on the tank top? Edited June 5, 2022 by Rob R Question on MW tank rivets 4 1 Link to post Share on other sites More sharing options...
Timber Posted June 5, 2022 Author Share Posted June 5, 2022 Yes rivets are on the tank. Just noticed that I need two central columns of rivets rather than the one that I currently have. This is easily changed. My rivets may also be a little too big but I can easily make these smaller as I finish up 6 2 Link to post Share on other sites More sharing options...
Timber Posted June 5, 2022 Author Share Posted June 5, 2022 (edited) High Level Gearbox and a High Level motor are used to power the locomotive. I have used a few of these motors and they are exceptionally powerful for their size, Edited June 5, 2022 by Timber 2 Link to post Share on other sites More sharing options...
RMweb Gold Regularity Posted June 5, 2022 RMweb Gold Share Posted June 5, 2022 IIRC, the main difference between “Old Class I”and “Class K” (some of which may have been new class I) was in length: boiler and wheelbase (middle to rear). If that’s so, will you be producing a K class as well? (Picture below from ColinBinnie.com, via http://britbahn.wikidot.com/manning-wardle-k-class) 2 Link to post Share on other sites More sharing options...
Timber Posted June 6, 2022 Author Share Posted June 6, 2022 I want to make three of these engines, Nos 58,35 and 49. I will probable take a break from MWs after that but maybe a K Class in the future. 1 Link to post Share on other sites More sharing options...
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