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Author Topic: Peckett OQ - the Mardy Monster  (Read 2381 times)

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Offline maridunian

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Peckett OQ - the Mardy Monster
« on: February 09, 2020, 11:57:19 PM »
My 3D-printed Pecketts B1-B3 have all been a little on the large side in order to to accommodate the Minitrix Dock Tank chassis.

The B3 was quite a beefy shunter, but it's dwarfed by the Peckett OQ Class which, had it ever belonged to BR would have carried a 7F power designation.

I've started to explore whether an OQ body-shell for the same chassis would be a hack too far.



Plenty of space inside for gubbins, but the cylinders need moving forward (or replacing) and new coupling pockets provided beyond the ends of the chassis.

Hmm. Could be interesting... watch this space!

Mike
« Last Edit: February 17, 2020, 09:59:23 AM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline maridunian

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Re: Peckett OQ - the Mardy Monster
« Reply #1 on: February 10, 2020, 11:26:25 AM »
Here's the first draft body superimposed on a blank of a Minitrix 0-6-0 chassis I use to ensure fit.



The brown areas are where the blank and body intersect and will need some attention.

The Monster's wheelbase is approx 11'6" - the chassis' is 20mm. Wheels are 4' 0.5" - Minitrix 6.5mm.

The real thing tends to rock and roll on dodgy track - so will this!

Mike

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

My 3D Modelshop:Maridunian's Models

Offline maridunian

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Re: Peckett OQ - the Mardy Monster
« Reply #2 on: February 15, 2020, 10:55:12 AM »
OK, well that's the body shell design more-or-less done:



Unlike my previous Pecketts I've added some details like safety valves and a reversing rod, but I don't expect these to survive through cleaning and finishing. We'll see.

I've decided to add cylinders under the footplate which will replace the Minitrix cylinder block. If my measurements are right, the longer footplate means the new cylinders can be angled upwards without the piston rods fouling the buffer beam. Again, we'll see...

Mike
« Last Edit: February 15, 2020, 03:38:57 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Online silly moo

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Re: Peckett OQ - the Mardy Monster
« Reply #3 on: February 15, 2020, 03:42:51 PM »
I might have to get one just for the name alone 😀

Offline maridunian

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Re: Peckett OQ - the Mardy Monster
« Reply #4 on: February 15, 2020, 05:24:21 PM »
I might have to get one just for the name alone 😀

Thank you! It'll be a while yet - I'm winging it on so many dimensions I'll probably need more than one test print iteration.

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

My 3D Modelshop:Maridunian's Models

Offline maridunian

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Re: Peckett OQ - the Mardy Monster
« Reply #5 on: February 16, 2020, 06:57:32 PM »
Ok, well that's the first print ordered from Shapeways .




It's my most complex project yet, with fit challenges around the piston rods and couplings, as well as the chassis itself.

Fingers crossed!

Mike

« Last Edit: February 17, 2020, 08:59:37 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Online emjaybee

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Re: Peckett OQ - the Mardy Monster
« Reply #6 on: February 16, 2020, 09:40:57 PM »
You do like your locos.

I can't believe how much you're dragging your heals on this one! I'd've thought you'd have blasted through this!

 :D

Looking awesome as ever, I'm guessing this is going to be another top job.

 :thumbsup:
Brookline build thread:

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=50207.msg652736#msg652736

Sometimes you bite the dog...

...sometimes the dog bites you!

----------------------------------------------------------

I can explain it to you...

...but I can't understand it for you.

Offline Bealman

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Re: Peckett OQ - the Mardy Monster
« Reply #7 on: February 16, 2020, 10:40:37 PM »
Looking good, Mike!  :thumbsup:
Vision over visibility. Bono, U2.

Offline maridunian

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Re: Peckett OQ - the Mardy Monster
« Reply #8 on: February 17, 2020, 09:51:03 AM »
You do like your locos.

Well, Pecketts, yes. I've hacked a couple of the Peco/GEM models previously, but they're rare, expensive and very broad. I always felt guilty taking a saw to one.

Modelling industrial railways, they're a must-have type. Peckett produced ~1500 diverse engines, individually built to order, but using many standard components.

From the modelling point of view, knowing the chassis fit and overall dimensions, having lots of the common components already drawn makes producing variants much easier than tackling something new.

I can't believe how much you're dragging your heals on this one! I'd've thought you'd have blasted through this!

 :D

Despite what I wrote above, it's still taken about four days of measuring and drawing to get to something printable.

Looking awesome as ever, I'm guessing this is going to be another top job.

 :thumbsup:
Thanks Mike. I'm mulling slide bars for the final version...

Mike
« Last Edit: February 17, 2020, 09:56:27 AM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline maridunian

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Re: Peckett OQ - the Mardy Monster
« Reply #9 on: February 17, 2020, 09:57:01 AM »
Looking good, Mike!  :thumbsup:
Cheers George!
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Online emjaybee

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Re: Peckett OQ - the Mardy Monster
« Reply #10 on: February 17, 2020, 09:57:35 AM »
You do like your locos.

Well, Pecketts, yes. I've hacked a couple of the Peco/GEM models previously, but they're rare, expensive and very broad. I always felt guilty taking a saw to one.

Modelling industrial railways, they're a must-have type. Peckett produced ~1500 diverse engines, individually built to order, but using many standard components.

From the modelling point of view, knowing the chassis fit and overall dimensions, having lots of the common components already drawn makes producing variants much easier than tackling something new.

I can't believe how much you're dragging your heals on this one! I'd've thought you'd have blasted through this!

 :D

Despite what I wrote above, it's still taken about four days of measuring and drawing to get to something printable.

Looking awesome as ever, I'm guessing this is going to be another top job.

 :thumbsup:
Thanks Mike. I'm mulling slide bars for the final version...

Mike

I promise I will at some point do one of your Pecketts. I've rather a backlog at the moment.
Brookline build thread:

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=50207.msg652736#msg652736

Sometimes you bite the dog...

...sometimes the dog bites you!

----------------------------------------------------------

I can explain it to you...

...but I can't understand it for you.

Offline maridunian

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Re: Peckett OQ - the Mardy Monster
« Reply #11 on: February 20, 2020, 06:00:49 PM »
First draft print arrived today. Here it is, straight out of the packet:





Next, a clean up then lots of measuring and tweaking under the footplate.

Mike

« Last Edit: February 21, 2020, 04:52:01 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline maridunian

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Re: Peckett OQ - the Mardy Monster
« Reply #12 on: February 21, 2020, 09:20:43 AM »
I've always cleaned up Shapeways Smoothest Fine Detail Plastic manually, soaking for a day in Swarfega or white spirit, then out with an old toothbrush and cocktail sticks.

I've been intrigued by mentions elsewhere about ultrasonic cleaners. I wasn't going to invest in one for my low level usage, but a chance mention to my wife produced one magically from a cupboard. Seems we've owned one for years for jewelry cleaning...

Mike
« Last Edit: February 21, 2020, 09:21:44 AM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop:Maridunian's Models

Offline Bealman

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Re: Peckett OQ - the Mardy Monster
« Reply #13 on: February 21, 2020, 09:30:16 AM »
Awesome!!!

 :thumbsup:  :thumbsup:
Vision over visibility. Bono, U2.

Online emjaybee

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Re: Peckett OQ - the Mardy Monster
« Reply #14 on: February 21, 2020, 09:53:03 AM »
I've always cleaned up Shapeways Smoothest Fine Detail Plastic manually, soaking for a day in Swarfega or white spirit, then out with an old toothbrush and cocktail sticks.

I've been intrigued by mentions elsewhere about ultrasonic cleaners. I wasn't going to invest in one for my low level usage, but a chance mention to my wife produced one magically from a cupboard. Seems we've owned one for years for jewelry cleaning...

Mike

Result!

I used mine for the first time in anger to strip paint off a brass Etched Pixels wagon. Stripped it beautifully, with finishing touch from a toothbrush.

I'm aiming to prep Shapeways prints in it using Heptane.
Brookline build thread:

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=50207.msg652736#msg652736

Sometimes you bite the dog...

...sometimes the dog bites you!

----------------------------------------------------------

I can explain it to you...

...but I can't understand it for you.

 

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