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Napier Deltic Engine Model

by zefram, published

Napier Deltic Engine Model by zefram Feb 16, 2013

Description

Model of the cylinder layout of the Napier Deltic engine found in the Deltic class of British diesel locomotives. 3D printed in 46 parts and assembled into a working model. A stop motion video is available in the downloads.

Recent Comments

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We printed this on an Ultimaker 2, using CURA for slicing and Ultimaker's PLA/PHA. Worked fine - beautiful design!

Observations:

- we had to take care to reorientate the cylinders and pistons - far better to print them sitting on their ends, otherwise they don't come out very circular.

- we printed the bases with 10% fill to save plastic - seemed fine.

- cogs printed without a brim curled up on the cog teeth a bit - better with a brim. Definitely don't use a raft - it's hard to remove without making a mess.

- cams needed a "support to base", which worked well. Same with cylinders, to make the protrusion work.

- double con-rods needed a support everywhere, and were printed flat. They are pretty rough on the undersides - high friction, and need sanding down.

- the cylinder links were best printed the other way up, so the little lugs weren't printed over space. This made them more accurate and fitted better into the cylinders.

We haven't glued any of it together because it works well without, although you have to be careful not to let the cam pins fall out! Otherwise, all settings were on CURA's defaults for Ultimaker/PLA.

Thanks!

I must print this, my place of work reconditions the cylinder liners for these engines.

Thank you for uploading the stop-motion video too, seeing it in motion really helps explain it.

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Instructions

Print all the parts and assemble, PDF instructions with pictures are provided in the downloads.
A STEP file and movie are also available in the downloads.

Part List
Stage 1
      1 x Base 1
      1 x Base 2
      1 x Base 3
Stage 2
      5 x Plain Gear
      1 x Cam Gear 1
      1 x Cam Gear 2
      1 x Cam Gear 3
      3 x Cam Gear Pin
      5 x Plain Gear Pin
      3 x Cam
Stage 3
      6 x Piston
      6 x Gudgeon Pin
      3 x Single Con Rod
      3 x Dual Con Rod
      1 x Cylinder 1-2 (I found it best to print cylinders vertically)
      1 x Cylinder 2-3
      1 x Cylinder 1-3
      3 x Cylinder Links

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Comments

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mbef on Dec 15, 2013 said:

We printed this on an Ultimaker 2, using CURA for slicing and Ultimaker's PLA/PHA. Worked fine - beautiful design!

Observations:

- we had to take care to reorientate the cylinders and pistons - far better to print them sitting on their ends, otherwise they don't come out very circular.

- we printed the bases with 10% fill to save plastic - seemed fine.

- cogs printed without a brim curled up on the cog teeth a bit - better with a brim. Definitely don't use a raft - it's hard to remove without making a mess.

- cams needed a "support to base", which worked well. Same with cylinders, to make the protrusion work.

- double con-rods needed a support everywhere, and were printed flat. They are pretty rough on the undersides - high friction, and need sanding down.

- the cylinder links were best printed the other way up, so the little lugs weren't printed over space. This made them more accurate and fitted better into the cylinders.

We haven't glued any of it together because it works well without, although you have to be careful not to let the cam pins fall out! Otherwise, all settings were on CURA's defaults for Ultimaker/PLA.

Thanks!

DrJekyll on Nov 21, 2013 said:

I must print this, my place of work reconditions the cylinder liners for these engines.

Corona688 on Aug 21, 2013 said:

Thank you for uploading the stop-motion video too, seeing it in motion really helps explain it.

mgg942 on Aug 1, 2013 said:

Great model. Thanks for posting it. I can attest to the soundness of your advice that the cylinder are best printed vertically!

I've made a time lapse video and posted it on YouTube. I hope that you are happy with the attributions. If not, please let me know.

http://youtu.be/aiHAGAjdFJA

zefram on Aug 1, 2013 said:

Good job, thanks for sharing the video, if you print and fit the cylinder links, they firm up the assembly and stop the cylinders wobbling. Mark

Nevil_Clavain on Feb 20, 2013 said:

Can a crank be put on to turn it?

zefram on Feb 20, 2013 said:

The two gears that hang over the base work pretty well as thumbwheels

3daybreaker on Feb 17, 2013 said:

Never heard of this type of engine. Looks amazing.
great work... thanks

Thomas
www.3daybreaker.blogspot.com

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