Horizontally Opposed 6 Cylinder Aircraft Engine
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Horizontally Opposed 6 Cylinder Aircraft Engine
3D
Published 2019-12-08T21:45:12+00:00
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Description
#Tinkermechanical
This object was created in TinkerCad https://www.tinkercad.com/things/c42DJM02Cxi
The inspiration for this print came from the Beech Baron aircraft (super fun to fly). I always love to assemble my 3D prints, it just feels more satisfying almost lego like. I designed this model so that you are able to use multiple colors and are able to make each component stand out. It is a 82 part build in total (including 8 bearings). It is amazing educational model that can be used in classrooms. It uses a 5 to 1 gearing ratio with a planetary gear system in the back, which requires the user to spin the knob in the back only slightly and it will result in the system moving 5 times faster. Each of the connecting rod's big end has a 685ZZ bearing that can be press fit. This particular bearing had the perfect ID to OD ratio that I was looking for and for low load situation such as this it is ideal.
Tinkercad truly is an understated software. I started this project with much simpler goals but after getting familiar with the software, I quickly realized just how powerful it is. If you are able to visual a part in your mind, Tinkercad can reproduce it. After the completion of this project, Tinkercad has become an integral part of my workflow. In the spirit of this competition, every single component was designed using Tinkercad.
In conclusion this is not really an easy build, but a very satisfying one. It require patience especially in the assembly phase. Huge thanks to the inspiration that came from all the Greg Zumwalt models. He truly inspired me to go bold with colors and inner mechanics. I hope to see people print this model in various colors and size (message me if you want a particular scale) and display it. This is a tribute to the open source hardware concept and what it stands for.
UPDATE: "Planetary Gear Bearing Housing" was the wrong STL file. It has now been updated with the correct one. Sorry for the mixup, this file has the 3 holes that are required to locate and align the "Middle Planetary Gears" and its pins. Let me know if there is any issues.
License
Printing Details
Total Parts Required.
Crank Case X 1
Piston Engine Cylinder X 6
Cylinder Head X 6
Cylinder Head Open Source Inser X 6
Connecting Rod X 6
Counter Weight X 6
Piston X 6
Gudeon Pin X 6
24 MM Rod X 3
14 MM Rod X 2
Prop Bearing Housing X 1
Prop Bearing Housing Pins X 2
Prop Blade X 3
Prop Securing Pin X 3
Prop Shaft X 1
Prop Spinner X 1
Planetary Gear Bearing Housing X 1
Planetary Gear Outer Gear X 1
Planetary Middle Gear X 3 (STL Includes 3 in one file)
Planetary Inner Gear X 1
1 MM Washer X 9 (12 included in one STL File)
685ZZ Bearings X 8
Start the sub assembly with the crankshaft.
Lay the counterweight flat part up, insert the 24mm rod in the outer hole and lay down a bead of cyanoacrylate. Lay a 1 MM Washer on top of this followed by the bearing and beads of cyanoacrylate between them. Don't use too much cyanoacrylate, little goes a long way. after the bearing has been laid down push fit the big end of a connecting rod on it. lay another 1 MM washer on top of this followed by the second counter weight this time flat side up. Repeat this 3 times. now you have the 3 subassemblies required for the crankshaft.
Insert the 14 mm rod between the 3 subassemblies ensuring that each counterweight is 90 degrees to the previous one eg: 270 degrees, 360 degrees, 090 degrees (refer to my pictures) after the crankshaft has been assembled insert the connecting rods into each of the cylinder (keep the offset in mind). After this you can assemble all the pistonts using the gudeon pins provided, no glue is required here it should be a nice tight fit. The small end of the connecting rod must NOT be tight on the gudeon pin it must remain really lose, to ensure this you may need to sand the inner part of the small end of the connecting rod.
Assemble the cylinder heads next, the open source hardware inserts will be a really tight fit on the cylinder heads (by design) may require a flat surface and some force. Once the cylinder heads are assembled, glue the cylinders to the crank case (cutaway side up). Glue the cylinder heads to the top of the cylinders.
The crankcase is now ready for final assembly. Push fit the bearings on either side of the crank case. The outer planetary gear will slide into the planetary gear bearing housing and the whole assembly will be push fit on top of the bearing, followed by the 3 middle gears and the pin for each of them. The pins on the middle gears will go all the way through the crank case, if too tight you can lightly sand the mushroom part of the pins. The inner gear can now slide into place, the shaft for this will slide directly into the crankshaft assembly. It is slightly oversized so you will have to lightly sand the shaft till it fits 'just right' between the bearing. This will provide a really nice fit, lay down some cyanoacrylate between the shaft and the ID of the bearings.
Now assemble the prop, slide all three prop blades into the spinner ensuring a counterclockwise movement of the blades. Slide the prop securing pin between the blades and the spinners. Slide the prop shaft in the center of the spinner use cyanoacrylate to secre everything in place. Slide the prop shaft into the bearing and this will slide all the way to the crankshaft. Secure the shaft in place with cyanoacrylate.
This concludes the assembly. The whole assembly is not really that complicated but requires that you take your time and follow the sequence correctly, ensure everything is as square as possible and that the glue has been used on the correct parts (too much glue can enter the bearings and sieze them). I highly reccomend sanding the insides of the cylinder bore, this will really give the pistons a smooth travel.
If you have any questions feel free to contact me.
Ace
Technical Information
Date published | 08/12/2019 |
Time to do | 1500 - 1500 minutes |
Material Quantity | Variable |
Dimensions | 125x120x50 |
Support Free | YES |
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