Astro61201 Posted January 18, 2021 (edited) Hi, I'm currently designing a 4-8-2 Gresley design on stud.io with the vision of building it in real life and as such I want to make it able to traverse various radius track curves, however I also want to retain a cohesive look for the chassis. I'm not overly concerned about the tightest of curves but I would still like to go as tight as possible without compromising aesthetics. My current design consists of: 4x - 20.8mm (MS) leading wheels Double Pivot 8x - 42.3mm (XXL) Driving Wheels 2x - 24mm (M) Trailing Wheels Tender. I was wondering about the feasibility of the design and if anyone has a similar setup, what curve sizes is their loco able to traverse? Edited January 18, 2021 by Astro61201 Added Pictures Share this post Link to post Share on other sites
M_slug357 Posted January 18, 2021 18 minutes ago, Astro61201 said: Hi, I'm currently designing a 4-8-2 Gresley design... *snip* ...I was wondering about the feasibility of the design and if anyone has a similar setup, what curve sizes is their loco able to traverse? Gotta post some pictures of your setup. It's (imho) the most expedient way to get help. Share this post Link to post Share on other sites
Astro61201 Posted January 18, 2021 28 minutes ago, M_slug357 said: Gotta post some pictures of your setup. It's (imho) the most expedient way to get help. Apologies, I have added some images to my original post. Share this post Link to post Share on other sites
Trainaud(LegoRailCreaties) Posted January 19, 2021 Question: How do you get the BigBenBricks wheels into Stud.io? Share this post Link to post Share on other sites
Astro61201 Posted January 19, 2021 1 minute ago, Trainaud(LegoRailCreaties) said: Question: How do you get the BigBenBricks wheels into Stud.io? Download them from his website (LDraw in the menu), then move the .dat file(s) to hard drive/ program files/ stud.io/LDraw/CustomParts If the custom parts folder isn’t there then create one. It is worth noting that these pieces lack connectivity features, to add them you need to import the piece into Part Designer and add an axle and pin connection, which is what I did. Share this post Link to post Share on other sites
Trainaud(LegoRailCreaties) Posted January 19, 2021 34 minutes ago, Astro61201 said: Download them from his website (LDraw in the menu), then move the .dat file(s) to hard drive/ program files/ stud.io/LDraw/CustomParts If the custom parts folder isn’t there then create one. It is worth noting that these pieces lack connectivity features, to add them you need to import the piece into Part Designer and add an axle and pin connection, which is what I did. Thank you for the help. Share this post Link to post Share on other sites
CDM Posted January 20, 2021 (edited) So long as your leading and trailing bogies pivot you should be able to negotiate Lego curves just fine...do you have a setup with track curves tighter than that?. You may have to tighten up your main drivers so the blind wheel overlaps the flange slightly. This results in axles 5 studs apart. I'm in the middle of a potential move and my track is packed away so I can't test it. Does this answer your question? Edited January 20, 2021 by CDM Share this post Link to post Share on other sites
Astro61201 Posted January 21, 2021 (edited) 23 hours ago, CDM said: 23 hours ago, CDM said: So long as your leading and trailing bogies pivot you should be able to negotiate Lego curves just fine...do you have a setup with track curves tighter than that?. You may have to tighten up your main drivers so the blind wheel overlaps the flange slightly. This results in axles 5 studs apart. I'm in the middle of a potential move and my track is packed away so I can't test it. Does this answer your question? Thanks for your answer, I’m aiming for a minimum curve radius of about R56 or R72, do you think this would be possible? Edited January 21, 2021 by Astro61201 Quoted Twice Share this post Link to post Share on other sites
CDM Posted January 22, 2021 19 hours ago, Astro61201 said: Thanks for your answer, I’m aiming for a minimum curve radius of about R56 or R72, do you think this would be possible? I would think so. Lego R40 tracks are unrealistically tight and it should work on that. Anything with a larger radii would be fine. I may get some track out this week to test a build of my own. I'll play around and report back. Share this post Link to post Share on other sites
High_Admiral Posted January 22, 2021 Wait, aren't XXLs restricted to higher radius curves? I thought I read somewhere that the XXLs were not able to take R40s due to their size. Share this post Link to post Share on other sites
CDM Posted January 22, 2021 (edited) 59 minutes ago, High_Admiral said: Wait, aren't XXLs restricted to higher radius curves? I thought I read somewhere that the XXLs were not able to take R40s due to their size. You may be right. I mistakenly thought my drivers were the XXL but are in fact 37/30mm. My apologies. Edited January 22, 2021 by CDM Share this post Link to post Share on other sites
zephyr1934 Posted January 22, 2021 If you KNOW you are going to build this and you are going to get the track, I'd suggest you get the wheels and enough track to start prototyping the frame. There are so many nuanced things that complicate frame building (e.g., pilot truck clearing the cylinders). Of course you are doing the right thing by asking questions to make sure it is even feasible before buying anything. If that is the case, perhaps rephrasing the question to be about the wheels in general, "Using XXL wheels with a spacing of 6 studs axle to axle (5 studs center to center), what is the tightest curve any of you are able to run on?" If this is your first steam MOC and you don't have any parts yet, you might want to start with something simpler first (L wheels) and keep this for your second steam MOC. Share this post Link to post Share on other sites
Astro61201 Posted January 22, 2021 14 minutes ago, zephyr1934 said: If you KNOW you are going to build this and you are going to get the track, I'd suggest you get the wheels and enough track to start prototyping the frame. There are so many nuanced things that complicate frame building (e.g., pilot truck clearing the cylinders). Of course you are doing the right thing by asking questions to make sure it is even feasible before buying anything. If that is the case, perhaps rephrasing the question to be about the wheels in general, "Using XXL wheels with a spacing of 6 studs axle to axle (5 studs center to center), what is the tightest curve any of you are able to run on?" If this is your first steam MOC and you don't have any parts yet, you might want to start with something simpler first (L wheels) and keep this for your second steam MOC. Thank you for your advice, I think prototyping is the best way to go. Share this post Link to post Share on other sites
Christians Trains Posted May 29, 2021 On 1/18/2021 at 4:52 PM, Astro61201 said: Hi, I'm currently designing a 4-8-2 Gresley design on stud.io with the vision of building it in real life and as such I want to make it able to traverse various radius track curves, however I also want to retain a cohesive look for the chassis. I'm not overly concerned about the tightest of curves but I would still like to go as tight as possible without compromising aesthetics. My current design consists of: 4x - 20.8mm (MS) leading wheels Double Pivot 8x - 42.3mm (XXL) Driving Wheels 2x - 24mm (M) Trailing Wheels Tender. I was wondering about the feasibility of the design and if anyone has a similar setup, what curve sizes is their loco able to traverse? I have a question. Where did you get the file for the MS leading wheels? I am looking for these wheels in digital form for stud.io. Share this post Link to post Share on other sites
