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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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At .47 inch (or 12mm) the repulsion force for the magnet below is only .03 lb. This force is unlikely to keep the engine rotating.
kjmagnetics.com/pr...D81-N52
1/2" dia. x 1/16" thick
Nickel Plated
Axially MagnetizedWould one magnet (above) or thicker magnet with this diameter, glued to each piston head run the engine? Would two or more magnets glued on one piston head be needed to run the engine? How much did this engine model cost to make? Would you sell it?
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!

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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

File Name

Downloads

Size

At .47 inch (or 12mm) the repulsion force for the magnet below is only .03 lb. This force is unlikely to keep the engine rotating.
kjmagnetics.com/pr...D81-N52
1/2" dia. x 1/16" thick
Nickel Plated
Axially MagnetizedWould one magnet (above) or thicker magnet with this diameter, glued to each piston head run the engine? Would two or more magnets glued on one piston head be needed to run the engine? How much did this engine model cost to make? Would you sell it?
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.
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.

youtu.be/aiHAGAjdFJA
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
Done. To do proper justice to your design I've made another video. Available here: youtu.be/bYZdIxZPZ1Q
Forgot all about them in the excitement of putting 99% of it together. I have already printed them so will fit today.
New video looks fantastic, good job.
Can a crank be put on to turn it?
The two gears that hang over the base work pretty well as thumbwheels
Never heard of this type of engine. Looks amazing.
great work... thanks

Thomas
http://www.3daybreaker.blogspot.com
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