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Bournville June 2nd 2019, 10am
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Norwich MBC Submariners joint Model Boat weekend - 27/28th July

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    3d printed Alfa Class Russian Submarine

    avatar
    JuanGg

    Posts : 8
    Join date : 2017-05-03
    Location : Spain

    3d printed Alfa Class Russian Submarine Empty 3d printed Alfa Class Russian Submarine

    Post  JuanGg on Sun May 14, 2017 9:08 pm

    Wanted to take a break from my U boot  build and also to try to make an entirely 3d printed model.

    -This project was finished 8 months ago, but needs a rework-

    Objectives:

    > As simple as posible, dinamic diving.
    > Really cheap.
    > Entirely 3d printed.

    For now just the CAD :

    3d printed Alfa Class Russian Submarine Vista_11
    3d printed Alfa Class Russian Submarine Vista_13
    3d printed Alfa Class Russian Submarine Vista_10
    3d printed Alfa Class Russian Submarine Vista_12
    3d printed Alfa Class Russian Submarine Vista_14
    avatar
    SWEnick

    Posts : 5
    Join date : 2018-09-06

    3d printed Alfa Class Russian Submarine Empty Re: 3d printed Alfa Class Russian Submarine

    Post  SWEnick on Tue Sep 18, 2018 7:36 pm

    How did it turn out? What materials did you use? Hull thickness? How much did the hull end up weighing? Did you print it in sections, and how did you fasten them together again? So many questions... =D
    david f
    david f
    AMS Treasurer

    Posts : 2028
    Join date : 2010-11-10
    Age : 68
    Location : Cumbria

    3d printed Alfa Class Russian Submarine Empty Re: 3d printed Alfa Class Russian Submarine

    Post  david f on Thu Sep 20, 2018 9:47 am

    I see that Juan last posted in March - so let't hope for a reply.
    Nick you can search for all postings from one individual and you can pm him. I see that Juan has done some interesting 3D printed superstructure.
    Over to you, Juan.

    David
    avatar
    JuanGg

    Posts : 8
    Join date : 2017-05-03
    Location : Spain

    3d printed Alfa Class Russian Submarine Empty Re: 3d printed Alfa Class Russian Submarine

    Post  JuanGg on Mon Jan 07, 2019 11:51 am

    I am deeply sorry for not replying earlier. It's been a long time, I have been busy and studying on another country, so not much time to devote to this. As I don't expect to work on my submarines until this summer, here are some pictures of what I did. Everything was printed in segments, in white abs. Then it was "acetone welded", painted with abs+acetone mix and then sanded. Hull thinkness is 2 mm and the model is about 50 cm long. Upper and lower hull are held together by magnets.

    3d printed Alfa Class Russian Submarine Hull310
    3d printed Alfa Class Russian Submarine Hull410
    Hull, after assembly and sanding.
    3d printed Alfa Class Russian Submarine Hull110
    3d printed Alfa Class Russian Submarine Hull210
    Hull inside and linkages. I used brass rods, paperclips (which do oxidize) and screw terminals. Not the best, but it worked. It was a pain to cram all that in the tiny aft cone. I'll see if I can take a photo of the inside linkages.
    3d printed Alfa Class Russian Submarine Rear110
    Rear view with an unfinished propeller. I printed them with the blades flat, then bent them with some pliers and then submerged them into abs+acetone to reinforce them. They were not that strong, but they worked fine. I made about five and I went trough three of them.
    3d printed Alfa Class Russian Submarine Wtc210
    Here you can see the WTC made out of a silicone tube, Endcaps were 3d printed, and a silicone gasket was used. Two screws pressed the endcaps in place. It was not reliable and often leaked. That's why I left it on hold, I'll have to make a proper WTC, and that would mean redoing everything but the hull, because it's not modular. Part of the rear magnetic copling can also be seen.
    3d printed Alfa Class Russian Submarine Magnet10
    This is the rotor that drives the magnetic coupling that in turn drives the propeller. It is connected to the motor by a gear, which is also 3d printed.
    3d printed Alfa Class Russian Submarine Wtc10
    This is the inside of the WTC. Motor is on the bottom, so are the batteries. I first had a servo push some switches to drive the motor, later on added an ESC.
    3d printed Alfa Class Russian Submarine Inwate10
    And here it is, in the water, it was weighted so just the sail (which was hollow) was above water. It could dive dinamically using the rear planes.

    Radio reception wasn't the best as I folded the antenna inside the compartment. This wasn't designed for great depths though.
    I even had planned adding an air pump and solenoid valve to make it statically dive with a rubber bag...That's not going to happen. If I ever get it properly working, it'll remain dinamic only.
    I maybe make a new wtc with a nice cilindrical container that I found, which has a threaded cap...Who knows...

    So there it is. I hope someone finds this interesting and can get something out of it. I'll remember to check the forum more often. Any questions/suggestions are welcome.
    Juan
    david f
    david f
    AMS Treasurer

    Posts : 2028
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    Age : 68
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    3d printed Alfa Class Russian Submarine Empty Re: 3d printed Alfa Class Russian Submarine

    Post  david f on Thu Jan 10, 2019 8:35 am

    Thanks Juan - a very nice simple project showing the capabilities of 3D printing.

    I wonder if your WTC problems could be solved by using a harder plastic tube with push-in end caps (lathe turned with a grooved O ring seal)?

    Thank you very much for posting this good looking model.

    David
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    Nickj_UK

    Posts : 6
    Join date : 2019-01-24
    Location : Cheltenham

    3d printed Alfa Class Russian Submarine Empty Re: 3d printed Alfa Class Russian Submarine

    Post  Nickj_UK on Thu Jan 24, 2019 8:07 pm

    Nice bit of work there Juan.

    I'm doing a similar thing but about 1m long. As it is quite long I've not printed the long hull sections (although I could have as my printer can build a little over 25cms a time but that would take 7-8hrs a print) but the main 'decorative' parts, bows stern, decking, conning tower and parts for a dive tank. I'll post some pictures at some point.

    In terms of mass my bow section, 110mm diameter with a slight taper down to a fat ellipse at the pointy end, is 3mm thick with the inner/outer skins at 1mm and a 30% material fill between them used about 18m of filament ~75gms of material (PLA).
    If I used a heavier infill or higher print resolution (<.2mm) the mass would increase but probably not more than 75 grams.
    It survived a cat incident, falling 2m and landing nose first (attached to the main hull) on a concrete floor without a scratch so is more than tough enough!
    PLA does biodegrade (eventually) as it is corn starch based but I've has printed parts outside exposed to the elements for over a year and they're unchanged. It is hard when printed and a PIA to smooth so I've left it as is.
    The advantage of 3D is that you can move from design to prototyping quite quickly

    Current sub project is a piston dive tank(s) the mechanics are fine (an hour to print a piston with a slot for o-ring) but the electronics are a bit of an evolving thing. I'll probably buy in a control system rather than painfully reinvent a wheel.

    Juan for your end caps, given your WTC is pretty thin the easiest solution would be a torus into the caps side wall to hold a 2mm o-ring. If the WTC material distorts then you could make it so that there is an outer shield.. body of the cap and o-ring sits inside and pushes out to contact the outer shield. Maybe overkill the sealing and have o-rings in both sections so they contact the outer and inner surfaces of the WTC, your printer ought to be able to handle a 2mm diameter overhang without any support


    Last edited by Nickj_UK on Thu Jan 24, 2019 8:09 pm; edited 1 time in total (Reason for editing : correction)
    david f
    david f
    AMS Treasurer

    Posts : 2028
    Join date : 2010-11-10
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    3d printed Alfa Class Russian Submarine Empty Re: 3d printed Alfa Class Russian Submarine

    Post  david f on Sat Jan 26, 2019 12:06 pm

    I have had the same positive experiences using PLA for model subs. It doesn't degrade and it certainly doesn't melt in the sun around here! (North of England.) I have mainly used it for deck fittings rather than structural items. But I'm trying it out for a drive coupling in my CSS Pioneer. (See photo below.)

    3d printed Alfa Class Russian Submarine 20190112


    Concerning piston tank control systems have you had a look at the thread on here?

    http://www.theassociationofmodelsubmariners.com/t1774-arduino-proportional-control-of-a-piston-tank?highlight=arduino

    It shouldn't be too painful to adopt or adapt if you are reasonably OK with Arduinos.

    David

      Current date/time is Thu Apr 25, 2019 2:52 am