Garden Railway Forum

So I thought I would do a test print of one of the drive bogies, still to print some of it, but everything bolted together quite nicely. It's big, considering it still has a leading and a trailing bogie to add to each end. Anyhow, I waffle, this is it as if earlier today.

The other chassis is a Victoria chassis just for size reference.

Well a couple more test prints done, one power bogie is roughly in the right place, the other hasn't been printed yet, but it's getting bigger.

Looking very tidy!
Given the natural tendency to "load up" a Garratt with a long train, would it be worth beefing up that worm/sprocket motor mount?

-steves- wrote: ↑Thu May 25, 2023 4:47 pm it's getting bigger

And it WILL be big! Love how it's sitting on what appears to be a book about Quarry Hunslets!

I really enjoy the stage of a project where you start putting the bits together and it begins to occupy what was previously empty space, giving a real sense that you're creating something new - even if it's possible my creations have taken up rather too much previously empty space in our small-ish house... I like how a build gradually gets heavier too, an imprecise but very tangible way of measuring progress...

Anyway, great work! Have you got a long enough train to stick behind it?!

Old Man Aaron wrote: ↑Fri May 26, 2023 2:24 am Looking very tidy!
Given the natural tendency to "load up" a Garratt with a long train, would it be worth beefing up that worm/sprocket motor mount?

Good spot I have already had to change the motor mount configuration as it was indeed a little flimsy for what it needed. As yet I have not printed the new parts and it still needs a little more CAD work on that area, but I do think what I have in mind now should work better.

Andrew wrote: ↑Fri May 26, 2023 9:37 am

-steves- wrote: ↑Thu May 25, 2023 4:47 pm it's getting bigger

And it WILL be big! Love how it's sitting on what appears to be a book about Quarry Hunslets!

I really enjoy the stage of a project where you start putting the bits together and it begins to occupy what was previously empty space, giving a real sense that you're creating something new - even if it's possible my creations have taken up rather too much previously empty space in our small-ish house... I like how a build gradually gets heavier too, an imprecise but very tangible way of measuring progress...

Anyway, great work! Have you got a long enough train to stick behind it?!

Ah, the Quarry Hunslet book, great book that, full of detailed plans and it's where Hughie / Stephen come from. I am sure lots more will come from that book over time.

It is getting heavier and the prints are only "light" tests prints at standard quality of 0.2mm and only 25% infill rather than the 0.12mm and 50% infill I usually print final models.

I have some more work to do on the power bogies now as I have realised that the boiler touches the motor bogie and needs a certain amount cutting away on the power bogie to allow for the boiler which goes below the footplate and fouls the swivel action. I think we all knew this was going to be a long and somewhat tedious project with lots of amendments being done along the way. But it's still great to see a thought and plan start coming to life

That's where 3D printing really shines, rapid prototyping, to (relatively) easily convert a design into a thing, and iterate! Looks like it's coming along well and I'm excited to see how it turns out.

drewzero1 wrote: ↑Fri May 26, 2023 9:47 pm That's where 3D printing really shines, rapid prototyping, to (relatively) easily convert a design into a thing, and iterate! Looks like it's coming along well and I'm excited to see how it turns out.

Absolutely, it's very easy to take what I have so far, make a couple of small adjustments and change it into something that's more useable, and repeat I have a new power bogie printed, just a case of getting the time to make the axles and put it all together. The axles are being milled at the ends so it's already pre quartered and the cranks match too, so in theory the quartering should be non existent

That's going to be very impressive....where did you get the drawings from? Are they readily available anywhere?

Garethep wrote: ↑Sat May 27, 2023 7:23 pm That's going to be very impressive....where did you get the drawings from? Are they readily available anywhere?

I found them online, I just looked for Garrett plans and that was one of the ones I found. Download it, printed it and started work. Whoever draw them has done quite an impressive job it has to be said.

Many thanks

A little progress was made on the garet. One power bogie with drive fitted, the other waiting to be completed when time allows.

Note the axles have been milled to get the quartering spot on and the cranks were made with the appropriate matching hole

Got a couple of pictures outside today.

Impressive, or what?

Peter Butler wrote: ↑Sun Jun 04, 2023 11:09 am Impressive, or what?

If I ever finish it, it will be a beast, lol.

I think you may find you will need blind centre drivers?

They even appear on things a lot smaller: Phil.P

Phil.P wrote: ↑Sun Jun 04, 2023 1:35 pm I think you may find you will need blind centre drivers?

They even appear on things a lot smaller:

Phil.P

Sorry Phil, call me think, but I have no idea what that means, even with the picture

Phil.P wrote: ↑Sun Jun 04, 2023 1:35 pm I think you may find you will need blind centre drivers?

They even appear on things a lot smaller:

Phil.P

Sorry Phil, call me thick, but I have no idea what that means, even with the picture

I did do this to the conrods to give an appearance similar to the original?

-steves- wrote: ↑Sun Jun 04, 2023 1:59 pm I have no idea what that means, even with the picture

Since the yanks don't speak english, they call a flangeless driving wheel on a loco a 'blind driver'.........

The prototype NGG16 has flanges on all driving wheels and will go around a 2 chain curve, so unless you are using LGB radius 1 curves, with model clearances you shouldn't need to use flangeless centre drivers.

You may find you need more sideplay on the pony trucks and/or more clearance between the boiler cradle and the engine units than scale. Been there, done that............

Graeme

GTB wrote: ↑Sun Jun 04, 2023 2:34 pm

-steves- wrote: ↑Sun Jun 04, 2023 1:59 pm I have no idea what that means, even with the picture

Since the yanks don't speak english, they call a flangeless driving wheel on a loco a 'blind driver'.........

The prototype NGG16 has flanges on all driving wheels and will go around a 2 chain curve, so unless you are using LGB radius 1 curves, with model clearances you shouldn't need to use flangeless centre drivers.

You may find you need more sideplay on the pony trucks and/or more clearance between the boiler cradle and the engine units than scale. Been there, done that............

Graeme

Thank you Graeme, I know exactly what you mean as I did the same for my Castle Harlech and used flangeless centre wheels on that. I may well need to do that in hindsight as I plan on using it on Peco track which is even tighter that LBG R1 as I use both 32mm track and 45mm track. The plan for this one is 32mm track.