Lancashire & Yorkshire Locomotives - QCAD and Fusion 360

Lancastrian

Western Thunderer
This is where I currently am with the Hughes Compound.
upload_2021-1-8_13-41-52.png

The top drawing shows the frames as set for S7, with the wheelsets drawn to prototype dimensions. Once again, I'm getting to the stage of running out of copies of the original drawings to work from, so will not be able to progress too much further, so I'll return to the Baltic Tank or the Belpaire firebox A class.

Ian
 

Lancastrian

Western Thunderer
Scale drawing showing clearances for a 6' (1828mm) radius curve on the inside rail and frame spacing for S7.
upload_2021-1-8_15-39-22.png

Axle 2 will have no side-play as that will have the inside cranks etc and axle 4 will have the gearbox and minimal side-play. I'll have to make some compromises when it comes to the outside connecting rods, as clearances are rather tight.

upload_2021-1-8_15-46-10.png

This is what it should eventually look like. As can be seen, hopefully, the leading coupling rods are offset, and this style was used on the Stanier 8F.



Ian
 

Lancastrian

Western Thunderer
I've only just noticed in the above photograph that the outside (HP) connecting rods have a section in the middle where there is no fluting. Would this be to allow the rods to bend in the event of a problem ? I can't say I've seen this before on a locomotive.

Ian
 
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Lancastrian

Western Thunderer
It has been a while since I've updated this thread as my attention turned to other things. However, I have been getting to grips with Fusion 360 for 3D CAD work, specifically for the 0-8-0 Compound, with advice and help from mickoo of this parish, Mike Hopkins and Nikki Wilkes.

Firstly, the cranks.
upload_2021-10-10_13-2-0.png

Then it was the turn of the coupling rods, which will also fit the small and large boiler 0-8-0 classes.
upload_2021-10-10_13-3-32.png

With some help from a GOG member, the inside connecting rod was drawn, which is also common to some of the other 0-8-0's depending on which Lot number they were built to.
upload_2021-10-10_13-6-48.png

The crossheads for the inside low pressure cylinders were more complex.
upload_2021-10-10_13-8-45.png

My attention then moved to the outside HP cylinder connecting rods.
upload_2021-10-10_13-10-1.png

Closely followed by the outside HP cylinder crossheads.
upload_2021-10-10_13-11-15.png

The outside slidebar brackets were then drawn.
upload_2021-10-10_13-12-50.png

Steam admission to the outside HP cylinders is derived from rocking shafts connected to the radius rods for the LP cylinder valves.
upload_2021-10-10_13-16-45.png

These do of course require mounting brackets.
upload_2021-10-10_13-18-37.png

The HP cylinder front covers have also been completed.
upload_2021-10-10_13-19-48.png

At the moment I am still working on the linkage for an intercepting valve. This allowed the locomotives to start as simples when in full gear, and automatically changing over to compound when the cut off was adjusted, similar to the Linder system originated on the Saxon State Rly.
upload_2021-10-10_13-22-27.png

Ian
 

Lancastrian

Western Thunderer
Hi Simon,

At the moment I am toying with investment casting for those items that will require it, but using resin prints for items such as the cylinder covers, for example.

The intercepting valve linkages could be cast, but do they need to be ? The activating rod will in all likelihood be etched, and the parts don't need to work, so they are in essence cosmetic. Even if I made the reversing gear work, those parts could stay resin/etched.

Items such as the slidebar brackets, connecting rods etc would be cast in either brass or nickel-silver depending on final finish.

Ian
 

Osgood

Western Thunderer
The partial lack of web on the o/s connecting rods as seen in the photo seems most peculiar to me - must reduce strength very significantly.
 

Lancastrian

Western Thunderer
Tony,

It is an interesting detail, though the drawings do not depict it, and I have seen other photos where the connecting rod does not have a section cut out.

Ian
 

Osgood

Western Thunderer
Amazing detail being worked up.
I'm intrigued by the curved feature in the LYR 0-8-0 drawings but can't decipher the G.A. - is it a horizontal stiffening plate attached to the main frame stay?

Frame detail 1.jpgFrame detail 2.jpg
 

Lancastrian

Western Thunderer
Hi Tony,

Yes, it is exactly as you surmise as can be seen here:
1646647697424.png
I believe it was there to provide additional bracing for the casting which ran central to the frames and contained an additional bearing/hornblock on the second axle, indicated by the dashed lines to the left of the frame stretcher.

Thank you for the kind words. At the moment it is an exercise just to see what I can incorporate into the locomotive, and a lot will depend on how well the parts will print/cast. It'll be a while until I get to the stage of making the thing, but the journey so far is educational and enjoyable. Next step is another visit to the NRM to get some more drawings photographed.

Ian
 
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Lancastrian

Western Thunderer
I've spent some time today completing the tank support bracket design for the Hoy 2-6-2T. It might be mad, but I doubt it will be seen as the 4 brackets sit behind the tank attached to the frames. The plan is to use the four "legs" to locate the brackets in the frames.
1646679140930.png

1646679164710.png

1646679207007.png

An hour after this was completed I then finished one of the standard designs of LYR locomotive brake blocks, suitable for 6 classes.
1646679298058.png

1646679379868.png

1646679405388.png

Ian
 

Lancastrian

Western Thunderer
I haven't posted in here for a while, so here's an update.

Spring compensation beams for the Lanky 0-8-0's,
1653907126533.png

1653907202840.png

The spring beam carriers,
1653907241197.png

Intermediate buffer casting, which would be fitted to the locomotives and tenders,
1653907286029.png

Platform supports,
1653907316883.png

LHS reversing shaft carrier,
1653907344733.png

RHS reversing shaft carrier,
1653907369899.png

Trailing hornguides,
1653907392284.png

Ian
 

Lancastrian

Western Thunderer
Some more work from this week on the 0-8-0 compound.

Test fit of the the horn guides in the frames.
1654266829824.png

The spring compensation beams and carriers added.
1654266897400.png


The platform support brackets, outside slidebar brackets, reversing shaft carriers and the rocking shaft brackets have been added also.
1654266937781.png

It was then the turn of the coupling rods.
1654267106075.png


Finally today, the central bearing support was completed.
1654267153397.png

Here are the frames in their current state with all the above fitted.
1654267193754.png

Ian
 
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