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Author Topic: Cowans Sheldon 75T Crane  (Read 7131 times)

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Offline AR

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Cowans Sheldon 75T Crane
« on: February 04, 2017, 01:16:25 PM »
Hello all,

This project revolves around the use of 3D printing to create a breakdown crane for my modern image university layout. I am currently designing it in Sketchup and have got thus far:







I will then send it it be printed and hand paint it upon its arrival. It has been designed to fit on some old Lima coach bogies that I recently acquired from the forum!

Thanks and look forward to your comments, good or bad!

Cheers,

Alex
« Last Edit: February 06, 2017, 01:30:19 PM by AR »
My Layout:

Flordon Heritage Railway (currently in the loft!)

http://www.ngaugeforum.co.uk/SMFN/index.php?topic=34537.0

My Current Project:

Reid-Macleod Steam Turbine Prototype

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=45211.60

Offline RailGooner

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Re: Breakdown Crane Project
« Reply #1 on: February 04, 2017, 01:55:38 PM »
Looking good Alex. What prototype is the inspiration?
“We are indebted to those soldiers who served with courage and distinction to bring peace to Northern Ireland,” UK Defence Secretary Gavin Williamson said. “The welfare of our former service personnel is of the utmost importance.”

Per Ardua ad Astra | Mens Agitat Molem | Victoria Concordia Crescit | Utrinque Paratus | Caveat lector

Offline AR

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Re: Breakdown Crane Project
« Reply #2 on: February 04, 2017, 01:59:31 PM »
Looking good Alex. What prototype is the inspiration?

Its lossely based on the Cowans Sheldon 75t crane but due to the lack of plans I am classing it as a freelance project!

Cheers,

Alex
My Layout:

Flordon Heritage Railway (currently in the loft!)

http://www.ngaugeforum.co.uk/SMFN/index.php?topic=34537.0

My Current Project:

Reid-Macleod Steam Turbine Prototype

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=45211.60

Offline RailGooner

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Re: Breakdown Crane Project
« Reply #3 on: February 04, 2017, 02:06:49 PM »
Its lossely based on the Cowans Sheldon 75t crane but due to the lack of plans I am classing it as a freelance project!

Cheers,

Alex

Closely based on, if not a perfect facsimile, I'd say.  :thumbsup:

This link might be useful to you https://docs.google.com/presentation/d/1nj0RTP5ZsE5euAsIT95yY6FnXiQf9i99LydAS4Z35pw/edit#slide=id.p26
“We are indebted to those soldiers who served with courage and distinction to bring peace to Northern Ireland,” UK Defence Secretary Gavin Williamson said. “The welfare of our former service personnel is of the utmost importance.”

Per Ardua ad Astra | Mens Agitat Molem | Victoria Concordia Crescit | Utrinque Paratus | Caveat lector

Offline AR

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Re: Breakdown Crane Project
« Reply #4 on: February 04, 2017, 02:41:55 PM »
Its lossely based on the Cowans Sheldon 75t crane but due to the lack of plans I am classing it as a freelance project!

Cheers,

Alex

Closely based on, if not a perfect facsimile, I'd say.  :thumbsup:

This link might be useful to you https://docs.google.com/presentation/d/1nj0RTP5ZsE5euAsIT95yY6FnXiQf9i99LydAS4Z35pw/edit#slide=id.p26

Thanks, that is really helpful! I have decided I may go down the route of making the bogies and just using the wheels I have but this raises a couple of questions I hope someone will be able to answer!
Firstly, how flexible does plastic need to be in order to allow wheels to be slotted into their respective holes (bearings)?
Secondly, with regard to the crane being able to go around curves do the wheels need to be on movable bogies or are they alright with the play created in the axles (ie side to side movemt) if that makes sense? I seem to remember other examples needing just the side ways motion to allow for the going around curves!

Thanks and I look forward to any advice!

Cheers,

Alex
My Layout:

Flordon Heritage Railway (currently in the loft!)

http://www.ngaugeforum.co.uk/SMFN/index.php?topic=34537.0

My Current Project:

Reid-Macleod Steam Turbine Prototype

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=45211.60

Offline RailGooner

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Re: Breakdown Crane Project
« Reply #5 on: February 04, 2017, 02:58:23 PM »
Depending on how tight a curve you're talking, having extra play on only inner wheels might do it.
« Last Edit: February 04, 2017, 09:16:22 PM by RailGooner, Reason: spelink »
“We are indebted to those soldiers who served with courage and distinction to bring peace to Northern Ireland,” UK Defence Secretary Gavin Williamson said. “The welfare of our former service personnel is of the utmost importance.”

Per Ardua ad Astra | Mens Agitat Molem | Victoria Concordia Crescit | Utrinque Paratus | Caveat lector

Offline Mito

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Re: Breakdown Crane Project
« Reply #6 on: February 04, 2017, 09:14:56 PM »
Looking forward to seeing this develop. There could be a potential customer here!
You know you're getting older when your mind makes commitments your body can't meet.
https://www.ngaugeforum.co.uk/SMFN/index.php?topic=24101.0 Off on a journey

Offline AR

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Re: Breakdown Crane Project
« Reply #7 on: February 04, 2017, 10:39:29 PM »
Hello all,

I have been doing my research and found that the easiest way to allow cornering would be to have the middle two axles flangeless. Now, I will research 3d printing metal wheels but not sure this will be very cheap so therefore I ask: does anyone know either how to remove the flanges of existing wheels or cheap way of acquiring flangeless wheels?

Any help would be great, thanks!

Alex
« Last Edit: February 12, 2017, 06:57:13 PM by AR »
My Layout:

Flordon Heritage Railway (currently in the loft!)

http://www.ngaugeforum.co.uk/SMFN/index.php?topic=34537.0

My Current Project:

Reid-Macleod Steam Turbine Prototype

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=45211.60

Offline AR

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Re: Breakdown Crane Project
« Reply #8 on: February 06, 2017, 01:23:52 PM »
Hello all,

Thanks to RailGooner's vote of confidence, I have decided to model the Cowans Sheldon 75T Crane directly. I dont have blueprints but I will get it as close as possible!
This involved some redesign but I am now forging ahead!

So, I have cracked on with the chassis, though there are still details and the stabilising legs to add but its getting there. I have also designed the basic bearings for the wheels.







Thanks,

Alex
My Layout:

Flordon Heritage Railway (currently in the loft!)

http://www.ngaugeforum.co.uk/SMFN/index.php?topic=34537.0

My Current Project:

Reid-Macleod Steam Turbine Prototype

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=45211.60

Offline Tank

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Re: Cowans Sheldon 75T Crane
« Reply #9 on: February 06, 2017, 01:45:59 PM »
Always good to see members models!  We're also creating the 75t for the forum, although the pace has come to a halt at the moment due to work commitments.

Offline jrb

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Re: Breakdown Crane Project
« Reply #10 on: February 06, 2017, 10:15:50 PM »





Alex,

You may be aware of this already & just not got around to it yet, in which case please accept my apologies, but you need to reverse the bluey-grey faces on your model.

SketchUp has both 'outer' faces (default white) and 'inner' faces (default that bluey-grey colour). I've done a lot of 3D work in SketchUp, and although I've never 3D printed any myself, I believe that if any of the faces are oriented wrongly you'll have problems when converting to a 'solid' file for printing.

Again, if I'm teaching old ladies to suck eggs then I apologise.


Jonathan

Offline AR

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Re: Breakdown Crane Project
« Reply #11 on: February 06, 2017, 10:18:03 PM »





Alex,

You may be aware of this already & just not got around to it yet, in which case please accept my apologies, but you need to reverse the bluey-grey faces on your model.

SketchUp has both 'outer' faces (default white) and 'inner' faces (default that bluey-grey colour). I've done a lot of 3D work in SketchUp, and although I've never 3D printed any myself, I believe that if any of the faces are oriented wrongly you'll have problems when converting to a 'solid' file for printing.

Again, if I'm teaching old ladies to suck eggs then I apologise.

Jonathan


Ah thank you! I have now found out how to reverse them:)

Cheers,

Alex
« Last Edit: February 06, 2017, 10:20:28 PM by AR »
My Layout:

Flordon Heritage Railway (currently in the loft!)

http://www.ngaugeforum.co.uk/SMFN/index.php?topic=34537.0

My Current Project:

Reid-Macleod Steam Turbine Prototype

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=45211.60

Offline AR

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Re: Cowans Sheldon 75T Crane
« Reply #12 on: February 07, 2017, 02:59:09 PM »
I have some very bad news!

Unfortunately, the way I had constructed the crane in Sketchup meant it was unprintable due to many small errors. This means I will have to start again form scratch.......not good! :censored: :censored:

Wish me luck as I embark on a new start with slightly less enthusiasm but shed loads of determination!

Cheers,

Alex
My Layout:

Flordon Heritage Railway (currently in the loft!)

http://www.ngaugeforum.co.uk/SMFN/index.php?topic=34537.0

My Current Project:

Reid-Macleod Steam Turbine Prototype

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=45211.60

Offline AR

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Re: Cowans Sheldon 75T Crane
« Reply #13 on: February 08, 2017, 10:08:21 AM »
Hello all,

After a day of playing around with the design to ensure it is 3D printable I have now started the chassis again! So far it is going well so hopefully progress will be steady if a little slow!

 




Cheers,

Alex
My Layout:

Flordon Heritage Railway (currently in the loft!)

http://www.ngaugeforum.co.uk/SMFN/index.php?topic=34537.0

My Current Project:

Reid-Macleod Steam Turbine Prototype

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=45211.60

Offline Skyline2uk

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Re: Cowans Sheldon 75T Crane
« Reply #14 on: February 08, 2017, 10:19:01 AM »
I have some very bad news!

Unfortunately, the way I had constructed the crane in Sketchup meant it was unprintable due to many small errors. This means I will have to start again form scratch.......not good! :censored: :censored:

Wish me luck as I embark on a new start with slightly less enthusiasm but shed loads of determination!

Cheers,

Alex

Don't give up my friend, I am sure as he lay on his back getting paint in his Eye and the occasional angry missive from the Pope, Da Vinci was often annoyed painting the Sistein Chapel!

Your pace of work is always impressive, so any setbacks won't take you long to recover from.

Skyline2uk

 

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