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Author Topic: 3D Peckett B1 0-6-0  (Read 447 times)

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Offline maridunian

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3D Peckett B1 0-6-0
« on: September 27, 2019, 08:59:39 AM »
Many people admire and collect mainline passenger and goods engines, often Big Four designs, which are very well represented in N Gauge. My greater interest is industrial locos, and amongst these, Pecketts are a diverse and (I think) interesting family, stretching (effectively) from 1864 to 1962 and comprising over 1500 locomotives. Here's their catalogue.

Thomas Peckett and Sons took over the locomotive business of Fox, Walker and Company in 1880, based at the Atlas Engine Works, Bristol. They produced their last steam engine some 78 years later.

Fox, Walker and Company had begun trading in 1864, building four and six-coupled saddle tank engines. Their B Class 0-6-0 saddle-tanks evolved into Peckett's B1, father to the B2 and grandfather to the B3. The original design was open cabbed with an exposed smokebox:



Fox, Walker 358 “Minnie” of 1878, at the Mangapps Railway Museum (From http://bestieboy.smugmug.com/Trains/Mangapps-Railway-Museum/i-rR7RsTs/0/L/358%20Fox%20Walker%200-6-0ST%20Mang%2019.05-L.jpg)

Peckett's B1 extended the tank to the front of the smokebox and featured a large enclosed cab incorporating the coal bunker.



Works photograph of class B1 locomotive, thought to be Peckett 750, which was supplied new on 9th December 1898 to Geo. Thomas & Co, 72A Deansgate, Manchester. (From https://www.irsociety.co.uk/Archives/62/Letters%2062.htm)

Having modelled the B3 and B2, it's pretty obvious what was missing from my collection, so I have produced a first draft 3D model of a B1. Available photographs of B1s, eg in this book, show lots of variations and so I chose a specific loco, Peckett 465 of 1890, supplied new to the Alexandra Docks Railway, Newport (No.18), eventually absorbed by the GWR as No. 679.

Although logically I should have started my 3D Peckett journey at the B1 and worked up to the B3, I started with the latter partly because I had a good drawing available from Martyn Bane’s site, but mostly because being so bulky, it gave me the best odds of wrapping the Minitrix chassis successfully. Having gained confidence about making body-shells, I went on on to tackle its slighter predecessors.

So, my starting point for the B1 was my B2 model which I altered by removing the trailing bunker and extended the cab backwards. A new dome and chimney were designed and substituted and tool boxes added to the footplate. Having gained confidence about the detail that can be produced in Shapeways Finest Detail Plastic, I also enhanced the model by adding window surrounds and roof rain-channels, slimming the handrails a little, hollowed the steps, added makers’ plates and, as an experiment, am trying printing the GWR number plates in situ.



Ok, so that's uploaded to Shapeways and ordered. I'll update here when it gets delivered!

Mike

« Last Edit: October 15, 2019, 05:29:51 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline maridunian

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Re: 3D Peckett B1
« Reply #1 on: October 03, 2019, 09:28:55 AM »
Well, the test print got back from Shapeways yesterday (standard priority and shipping):



Being translucent, these prints are hard to photograph - quite a bit of processing was needed to show any detail.

I'm pleased with it overall. Dome and chimney both look a bit skinny, but will judge everything properly when primed and compared with available photos.

It's now off to the Swarfega dip for a day or so to soften the remaining support wax for toothbrushing-off, then on to priming tomorrow.

Mike
« Last Edit: October 03, 2019, 12:06:21 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline Bealman

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Re: 3D Peckett B1
« Reply #2 on: October 03, 2019, 10:20:45 AM »
OK, I'm not being critical in any way here.... I think the project is awesome!  :thumbsup:

However, I do agree that the dome and chimney look a bit skinny - compared to the prototype photo, but not the CAD.

Your model seems faithful to the CAD.

Said me, knowing nowt about 3D printing!  :beers:

George
Vision over visibility. Bono, U2.

Offline maridunian

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Re: 3D Peckett B1
« Reply #3 on: October 03, 2019, 10:34:23 AM »
OK, I'm not being critical in any way here.... I think the project is awesome!  :thumbsup:

However, I do agree that the dome and chimney look a bit skinny - compared to the prototype photo, but not the CAD.

Your model seems faithful to the CAD.

Said me, knowing nowt about 3D printing!  :beers:

George

Thanks George - part of the problem is not having a drawing of the prototype, but even if I did the model has to envelop the Minitrix chassis.

The width and wheelbase are ok, and the overall length OK-ish, but the motor's taller than I'd like. If I'd made these models to scale, but stretched them only vertically, they'd look very odd, so there are many adjustments needed to keep things looking right-ish.

For the dome and chimney to look righter I need to make their diameters the correct proportion of their height, their height being driven by the cab height, which is driven by needing to clear the motor...

I'm enjoying this, honest!

Mike
« Last Edit: October 03, 2019, 12:12:07 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Re: 3D Peckett B1
« Reply #4 on: October 03, 2019, 10:49:17 AM »
Cool. Thanks for the explanation.

To be honest, I think it's a perfectly acceptable model.  :thumbsup:
Vision over visibility. Bono, U2.

Offline maridunian

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Re: 3D Peckett B1
« Reply #5 on: October 03, 2019, 11:53:52 AM »
Cool. Thanks for the explanation.

To be honest, I think it's a perfectly acceptable model.  :thumbsup:

Thank you - I realise I tend to talk down the accuracy of this project's models, but IMHO the results look realistic and compare favourably with the Minitrix bodyshells on size and (say) the Farish J94 on detail.

The adjustments needed to the dome and chimney diameters will be 0.5mm or less!

Mike
« Last Edit: October 03, 2019, 11:58:08 AM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Re: 3D Peckett B1
« Reply #6 on: October 03, 2019, 11:57:01 AM »
I think I'm happy with half a mil out!!!  :thumbsup:
Vision over visibility. Bono, U2.

Offline maridunian

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Re: 3D Peckett B1
« Reply #7 on: October 04, 2019, 06:08:11 PM »
Here's the model after cleaning up and a first coat of Halfords primer:



I'll work my way around it now, with all the prototype photos I can lay my hands on, making a list of fixes and tweaks. Overall, I think it's pretty close to what I'm looking for.

Mike

« Last Edit: October 04, 2019, 06:11:33 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline emjaybee

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Re: 3D Peckett B1
« Reply #8 on: October 04, 2019, 08:12:30 PM »
Here's the model after cleaning up and a first coat of Halfords primer:



I'll work my way around it now, with all the prototype photos I can lay my hands on, making a list of fixes and tweaks. Overall, I think it's pretty close to what I'm looking for.

Mike

That looks great.

Was that the 'finest' print you could do, I'm wondering if a finer print would produce less 'stripes'.

Cracking looking thing thou.
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Offline maridunian

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Re: 3D Peckett B1
« Reply #9 on: October 04, 2019, 10:36:25 PM »

That looks great.

Was that the 'finest' print you could do, I'm wondering if a finer print would produce less 'stripes'.

Cracking looking thing thou.

Thank you. Yes, that's "Smoothest Fine Detail Plastic". I would expect to apply 1/2 more coats of primer, then 1/2 top coats, with some rubbing down between each. Watch this space!

Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Re: 3D Peckett B1
« Reply #10 on: October 04, 2019, 11:13:45 PM »
Total thumbs up from the Antipodes  :thumbsup:
Vision over visibility. Bono, U2.

Offline maridunian

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Re: 3D Peckett B1
« Reply #11 on: October 06, 2019, 11:33:32 PM »


Following a rub down - well, truer to say a scrape down using the edge of a sharp blade. The aim isn't to remove the ridges, because they are correct according to your design, it's to remove primer from the ridges, leaving the valleys filled. Another coat of primer overall following some brushed primer on the dome and chimney. These will each get 1/2 extra coats of brass/black/copper anyway, so will plump up gradually.

When I've edited the tweaks into the design, I'll make the model available.

Mike
« Last Edit: October 07, 2019, 12:54:40 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline maridunian

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Re: 3D Peckett B1
« Reply #12 on: October 07, 2019, 01:12:51 PM »
Ok, well that's a wrap.
  • Dome and chimney fattened up a little.
  • Cab horizontal trim made slightly less prominent.
  • Tank handrails made slightly more prominent.
  • Small pips added inside steps to help retain body on chassis. (I have done away with the securing bolt provision on this model, which required people to trim the bolt provided by Minitrix, risked damage to the body-shell from overtightening, etc, etc).



It's now available from Shapeways.

Mike
« Last Edit: October 07, 2019, 03:29:05 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Re: 3D Peckett B1
« Reply #13 on: October 10, 2019, 09:21:34 AM »
OK, well I think that's about it for this one!



Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:  Maridunian's Models

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Re: 3D Peckett B1
« Reply #14 on: October 10, 2019, 09:49:13 AM »
Magnificent, Mike.  :thumbsup:

To paraphrase the old Graham Farish slogan,

A masterpiece in miniature.  :thumbsup:
Vision over visibility. Bono, U2.

 

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