Mossys 3D Models

I'm still waiting from a replacement light unit for the Mono X2, so have carried on printing the components on the smaller mono. The body sections will have to wait a while.

I already had the westie brake and air reserve (bottom) which have been used on another project, and decided to use the queen posts and turnbuckle (top) drawn for the un-finished low arc brake third project from about 18 months ago.



It took two print runs to get a full set of seats for a first class and 5 third class compartments.



I then moved on to a test build of the bogie, it's not quite right being 3mm to wide, but also I need to modify the middle cross members to make better swivel points for the compensation and beef up the joints between the two halves, other than that the foot boards and brakes fitted perfectly. On the final build the pins would be cut away and filed flat.



Bogie side view, brakes only on the righthand wheel set and barely visible (the compensation unit is upside down), but I love the detail.

 

Andy

A picture better than a thousand words. Directly above the 37 ft centres is the central footboard, above that is a turnbuckle and symmetrically either side are downwards pointing Queen posts, them and the turn buckle are used to tension the steel bracing of the coach body.

 

Thanks for that Rob, I think with a bit of work I could beef up pretty much all of the bogie by at least 1mm, It was printed using Craftsman resin, that's why the detail is so good, I could revert to ABS and/or Tough and lose some of the detail. Something to think over, but for now I am going to continue with the 3d printed bogies. Also producing extra bogies would be much of a task and the assembly easy enough using the X2 I could easily print all the components for 2 sets in a single print run of about 1 1.2 hours. The alternative is to find an etched brass bogie and modify it then add the individual details to it.

In the GOG forum discussions was anything mentioned about the weights involved that stressed the failed bogies?

 

I've been trying to figure out the all up weight of a 3d printed coach, but can't find a way of discounting the weight of the supports/skate. I'll do some more fiddling as it's an interesting problem and knowing the all up weight would be interesting in it's own right.

Found a way of making a broad estimate and I think all up with an interior its around 300grams.

Chassis 50g
Body 130g
Roof 50g
Interior 70g

All Up 300g

 

Given Rob's comments above I decided to try figure out the all up weight more accurately than my best guess of 300g and it came out nearer to 500g! What stood out was the weight of the seating witch I had modelled solid, so these have been reduced by cutting away anything un-necessary reducing them from 160g to to 90g, also designed as a solid are the 4 gas cylinders, these will be reduced similarly saving at least another 20 grams. All this will bring the weight down to nearer 400g.

I already had changes planned for the bogies along with making those changes I have also increased the thickness of the bogie frames and cross members by .5g to increase their rigidity.

 

What I did the last time around was use the settings for an M3Max. Each body was rotated so it was vertical to the build plate, put on plate and then sliced. The chassis and roof got cut way as they are to long so I had to estimate the extra weight. Tot up the resin used and hey presto not far off 500g, which is why I started losing weight and beefing up the bogie frames.

I did a print run this morning using Tough resin, ok I c....d it up by missing some supports but the detail than did print was ok but no where near as crisp as Craftsman, it also has a weird texture it feels slightly rubbery even after curing, I wont be buy any more when this bottle runs out, As a second test with the supports fixed I used ABS like, it's definitely better than tough but not as good as Craftsman. So now I'm in a quandary, ABS for strength or Craftsman for detail.
I'm still chewing over that one, no decision yet.

 

Paul

I used essentially the same estimate method except I positioned the body vertically and assumed the weight displayed was only that on the build plate so estimated the weight of the cut off sections and added it in.

ASB resin, my settings are the Anycubic Standard with a couple of exceptions, skate 7 layers, cure time 40 secs but I didn't know about turning anti aliasing off. All up I have decided to go with the better detail of craftsman.

The X2 has finally been fixed, Anycubic sent me a new lamp array so I have bit the bullet and stared printing one half of the body. Results in 4-5 hours time.

Mossy

 

Rob sadly test 1 died a death chassis separated from the body on one corner, as always it was on the side you cant see so it ran for 4 1/2 hours before I found it. Grrrrrrrr.
I think I know what was wrong so a retest is about to start.

Mossy

 

I suspect a lady with insufficient support around the chest area. More crucially I have an enormous whoopys. its too narrow and not quite long enough, so I have scrapped it and am restarting it, I could have carried on but I would know it wasn't right so I would rather bin it and restart, it shouldn't take to long as I know what to do and why.

 

Does anyone know where I can get some of the attached? They are thin sanding sticks, double sided with a foam core and come in different grades. This is my last one and I can't find any anywhere on the internet.

Cheers Mossy

 

Ta Tom

These are at least 20 years old, sadly as the sticks wore out they were thrown I now have only this one left and the core foam like stuff is starting to disintegrate so I need to source some more and these are really thin 5mm or so, very useful at getting into awkward bits. I will have a surf of Amazon I never think to use it. I've been fiddiling with your Fletcher dome (just practice) I need to know your boiler diameter for the real thing, you already sent me the smokebox diameter so my class A chimney should fit .