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Class A3 4-6-2 in O Gauge from Hatton's

A3 A4 Teak Gresley O gauge Record breakers




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#126 Silverstreak

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Posted 16 September 2017 - 19:48

Hi Giles, thanks for the feedback.

 

There's no need to be sorry and we certainly do welcome the feedback. We're just as concerned with making sure the unquestionably iconic shape is faithfully reproduced.

 

I'll certainly be looking further in to the points you have raised once I'm back in the office.

 

Thanks again and have a great weekend.

 

 

Cheers,

 

Dave

The rear shape of the double chimney and the slope down to the Smokebox should be in two stages. The Cad image of the model gives the impression its a single sloping drop to the smokebox. DJh got that right with both their A4 kits Finney not so for BR days


Edited by Silverstreak, 18 September 2017 - 11:22 .


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#127 boeing7572t6

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Posted 18 September 2017 - 08:22

Can we please have a picture of the A4 from head on? This was the aspect of the model which caused most adverse comment and is the only view missing form the Cad images
Bob

#128 vonmarshall

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Posted 18 September 2017 - 12:34

Really interested in these new releases, particularly the coaches. Are there any actual photos yet or are we still only able to see CAD representations. It will be interesting to see how the teak effect is handled.



#129 Hatton's Dave

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Posted 19 September 2017 - 10:43

Hi all,

 

Here's a view from the front of the 3D printed A4.

 

A4_3D_front.jpg

 

As ever, we're keen to hear feedback to make sure that we get this right.

 

 

Cheers,

Dave


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#130 Giles

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Posted 19 September 2017 - 15:09

So far as I can tell from photographs, the front end should still taper in more. The 'nose' would appear to be about 70% of the width at the bottom compared to at smokebox level.

a4%20FRONT_zpsskoe06xb.jpg
 

I think the taper still has to be more.... note that at the bottom, the width of the nose is significantly less than the gauge to the bogie wheels. Note also that the lamp-irons directly above the buffers have more-or-less and equal amount of flat space on each side, whereas on your print, there is only a small gap before the nose rises

 

Is the chimney wide enough? the full size one has a very meaningful one...!

 

We'll get there!

 


Edited by Giles, 19 September 2017 - 15:14 .

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#131 HSB

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Posted 19 September 2017 - 18:10

It does appear from the above pictures that the taper should be slightly more although comparing it with the distance between the wheels is rather misleading as they are to finescale standards not Scaleseven!


Edited by HSB, 19 September 2017 - 18:14 .

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#132 Silverstreak

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Posted 19 September 2017 - 19:25

 

So far as I can tell from photographs, the front end should still taper in more. The 'nose' would appear to be about 70% of the width at the bottom compared to at smokebox level.

a4%20FRONT_zpsskoe06xb.jpg
 

I think the taper still has to be more.... note that at the bottom, the width of the nose is significantly less than the gauge to the bogie wheels. Note also that the lamp-irons directly above the buffers have more-or-less and equal amount of flat space on each side, whereas on your print, there is only a small gap before the nose rises

 

Is the chimney wide enough? the full size one has a very meaningful one...!

 

We'll get there!

 

 

That head on image of a real A4 is very telling, the models shape and chimney do not match



#133 micklner

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Posted 19 September 2017 - 19:48

Chimney too narrow , Footplate too wide and or Boiler too narrow .



#134 Giles

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Posted 19 September 2017 - 21:01

Another frontal for reference. Width over footplate is (I understand) 9ft, buffer centres 6' 8 1/2". Boiler barrel is 6' 5" plus cladding of course.


36494709834_3b9c27847b_b.jpg2017-09-19_09-56-09 by giles favell, on Flickr

Edited by Giles, 19 September 2017 - 21:03 .


#135 Hal Nail

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Posted 19 September 2017 - 21:35

Chimney too narrow , Footplate too wide and or Boiler too narrow .

 

Boiler too narrow for me. The 4468 shot is possibly slightly deceptive as the valances are full whereas the model is the cut away version, but the footplate doesn't look too wide to me whereas the boiler width at its widest should be about in line with the buffer centers?



#136 Osgood

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Posted 20 September 2017 - 06:56

With a shape as complex as this, I think it would take an image shot from pretty much the exact same angle to allow an accurate assessment of any differences.

Giles' first shot (Shildon loco) is taken from a subtlety different viewpoint than that of the 3-D sample, which makes a big difference when comparing physical shape.

Edited by Osgood, 20 September 2017 - 07:34 .


#137 Giles

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Posted 20 September 2017 - 08:48

Trying to give more helpful data, the vertical line of double fixings would appear to be just in board of the main frames. This photo would seem to show the support to the plate work, mounted off a secondary frame.
I don't know what the A4's distance between frames was, but many express locos were 4' 1 1/2" between frames

36503505964_3affbe1ecb_k.jpgScreenshot_20170920-093710 by giles favell, on Flickr

Note also the very small buffer heads.

36944056160_8592cb5f2a_z.jpg2017-09-20_09-42-30 by giles favell, on Flickr

Edited by Giles, 20 September 2017 - 08:57 .


#138 MikeTrice

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Posted 20 September 2017 - 10:31

Does this help?

compare1.jpg


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#139 MikeTrice

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Posted 20 September 2017 - 11:44

Another showing dimension over opening:

IMG_3362.JPG


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#140 Giles

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Posted 20 September 2017 - 15:08

THAT's what we needed!!!!!!!!



#141 Silverstreak

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Posted 20 September 2017 - 19:10

THAT's what we needed!!!!!!!!

 Cant argue with that at all whether it will be altered, well we will just have to wait and see



#142 Hatton's Dave

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Posted 22 September 2017 - 14:32

Hi all,

 

In the interest of making it easier to follow a specific project and provide feedback, I've separated the threads for each of our O Gauge projects.

 

This thread will remain in place for updates and discussion around the LNER Class A3 4-6-2.

 

If you're looking for the LNER Class A4 4-6-2 click HERE.

 

If you're looking for the LNER Gresley Teak Coaches click HERE.

 

 

Cheers,


Dave



#143 Hatton's Dave

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Posted 12 January 2018 - 14:28

Our Class A3 and A4 in O gauge are a pair of complex projects - each locomotive having many details which are fairly unique to the class.  This has presented us with several challenges during the CAD development stages and meant it has taken slightly longer than planned to get to the tooling stage.  Both models are now in the tool room, metal is being cut and shaped and in the process of being completed.  On such complex and large models this will take a while and we have outlined some updated dates for the project.

 

1st Samples - Mid March 2018

2nd Samples - Early July 2018

Decorated samples - Early August 2018

Production Samples - Mid September 2018

Delivery - Mid February 2019

 

Following comments made about other O gauge items with gear problems, we have discussed the use of differing materials for the main drive gears

 

The material choice will affect multiple factors and the best decision will be made by testing different solutions.  The motor has been designed to have less stress on the gears due to its orientation in the drive train. We will also be testing different materials for the gears - both delrin and brass.  Both have pros and cons but we will be open with our results and let you see which was chosen and the metrics we have used to test them.

If you have any questions or comments then please, either post them here, or contact us on info@hattons.co.uk and we will be happy to hear them.

 

 

Cheers,

 

Dave


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#144 Simond

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Posted 12 January 2018 - 20:18

Dave,

I’d like to congratulate you & the team on your open and proactive approach to the issue - I’ve copied the link to the G0G forum.

Best
Simon

Edited by Simond, 12 January 2018 - 20:21 .

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#145 JeffP

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Posted 13 January 2018 - 11:21

And I would like to second that.










Also tagged with one or more of these keywords: A3, A4, Teak, Gresley, O gauge, Record breakers

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