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Topic review - 3D print screws
Author Message
  Post subject:  Re: 3D print screws  Reply with quote
Our Rhino work is progressing nicely :wave_1:

Image
Post Posted: Fri May 04, 2018 3:15 am
  Post subject:  Re: 3D print screws  Reply with quote
vkim wrote:
Are you planning to make 1/350 DDH Hyuga/Ise screws? They are totally wrong in the kits.

viewtopic.php?f=49&t=100074&start=20

As far as I know, these are 5-bladed controllable pitch screws. I'd certainly be able to design a set for these ships, but it seems like there is nothing useful on the internet at all. There are tons of very high quality photos of the ships, underway and close-up, but unfortunately nothing from the aft end of the drydock (too specific?). Seems like I'll need some help hunting down the pitch, diameter, and lots of photos.

@Bruce, your boat design is amazing! Fusion 360 is many worlds better than 123D Design, and it's just as easy to pick up on!

Suggestions of new screw designs are welcomed, but it would be more possible to do if the necessary information (pitch, diameter, and photos/drawings, etc.) is provided.

Aur
Post Posted: Wed Apr 25, 2018 12:25 pm
  Post subject:  Re: 3D print screws  Reply with quote
vkim wrote:
Are you planning to make 1/350 DDH Hyuga/Ise screws? They are totally wrong in the kits.

viewtopic.php?f=49&t=100074&start=20


ooooo good call! I'd take a couple of sets.
Post Posted: Wed Apr 25, 2018 4:24 am
  Post subject:  Re: 3D print screws  Reply with quote
Are you planning to make 1/350 DDH Hyuga/Ise screws? They are totally wrong in the kits.

viewtopic.php?f=49&t=100074&start=20
Post Posted: Tue Apr 24, 2018 10:32 am
  Post subject:  Re: 3D print screws  Reply with quote
I second Matthew's comments about Fusion 360. Found it a few months ago and have been using it to create models for some of the "harder" small assemblies for my project. All of the parts Shapeways has been able to produce.

Here's a sample of a 35' Motor Launch done in 1/144 scale.

Image
Post Posted: Mon Apr 23, 2018 7:18 pm
  Post subject:  Re: 3D print screws  Reply with quote
I am in love with Fusion 360.

I noticed that it has tools for doing things like prop blades that would likely make it vastly easier to use than 123D.

I haven’t been able to do much with the plain drafting tools yet. But the 3D modeling tools, and free access for small companies and hobbyists makes it an incredibly attractive platform for modelers.

The props almost make me want to do a full-hulled ship.

Maybe one day.

MB
Post Posted: Sun Apr 22, 2018 12:38 am
  Post subject:  Re: 3D print screws  Reply with quote
guset wrote:
Where is it possible to order a 1/350 set of these Iowa class screws?

Hi there,

You can find the item on our shop by simply googling Iowa class screw set, and our Shapeways page should come up right away. We're not a ModelWarships sponsor, and so could not post product links here.

Regards,
Aop & Aur
Post Posted: Sat Apr 21, 2018 11:21 am
  Post subject:  Re: 3D print screws  Reply with quote
Where is it possible to order a 1/350 set of these Iowa class screws?
Post Posted: Fri Apr 20, 2018 8:43 am
  Post subject:  Re: 3D print screws  Reply with quote
Tom Dougherty wrote:
Great link about Ice Cream, but I fail to see the relationship to propellers....

:heh:
That was confusing indeed, but then I went to search for the book on Google and fogot to share the link here.
The other links from Tom and Robert are great as well, lots of insights and detailed explainations!

The renders of Fusion 360 look very good, so I took the time to transfer the old Iowa screws file (made with 123D) into the program, and generated new renders for it.

Image


I've also made a few pics for the Bismarck - Tirpitz set (rescaled upon request by another designer.)

Image

For the next projects, I'm trying to gather more info for the South Dakota screws. I'm also looking for references for the KGV and HMS Hood, both of which lack the pitch data. I have a few photos of these from the internet and EJ here, but they aren't ideal for blade outline drafting, so if anyone has any other decent pics (of both classes), please share them here.


Regards,

Aur
Post Posted: Sun Apr 08, 2018 11:08 am
  Post subject:  Re: 3D print screws  Reply with quote
Thank you Tom.
The book from 1885 shows the different ideas from the very beginning if this new technology.

There are quite some more books:
archive.org - marine propellers

and from 1988

Robert
Post Posted: Sun Apr 08, 2018 12:59 am
  Post subject:  Re: 3D print screws  Reply with quote
OK, thanks for the correct, revised link. I note that the treatise is from 1855.

Here's something quite a bit more up to date from MIT:
http://web.mit.edu/2.016/www/handouts/2005Reading10.pdf
Post Posted: Sat Apr 07, 2018 7:13 pm
  Post subject:  Re: 3D print screws  Reply with quote
Great link about Ice Cream, but I fail to see the relationship to propellers....
Post Posted: Sat Apr 07, 2018 11:38 am
  Post subject:  Re: 3D print screws  Reply with quote
Books with the necessary theoretical background can be easily found on archive.org
For example screw propeller.
Of course in 1:200 and 1:350 this is not very important but still interesting.

Robert
Post Posted: Fri Apr 06, 2018 2:05 pm
  Post subject:  Re: 3D print screws  Reply with quote
After getting used to the new Fusion 360 software, I tackled the North Carolina-class screw design with a good amount of references obtained through dozens of internet searching and pictures provided by Maarten. :thumbs_up_1:
Below are some renders of the design, generated by the Fusion 360 itself:

Image

Outboard LH 4-blader:
Image

Inboard LH 5-blader:
Image

Shapeways' render in frosted detail plastic material:
Image

Note that this design is specific to the North Carolina-class battleships, and differ from those of the Iowa and South Dakota in every elements (measurements, pitches, shapes, etc.) I would be doing a design for the SoDaks once I figure out the accurate and suitable configuration (there are many!)

This item can be found on our Shapeways shop, recently renamed 3D Shipwright.

Aur
Post Posted: Fri Apr 06, 2018 11:51 am
  Post subject:  Re: 3D print screws  Reply with quote
3dnavy wrote:
Hi Aur,

your propellers look very good. :thumbs_up_1: I know how dificult it is to design nice propellers.
I've done several test prints at shapeways too, all designed with Blender. (My main field of interest is the german imperial navy)

Currently I'm waiting for my first print in in HP Nylon (PA12).

Strong & Flexible is too rough and weak, in my opinion.

I was impressed of the "raw brass" and "frosted extreme detail" quality. :woo_hoo:



In my small blog I've described my approach (in german but google translation works well :cool_1: )
3dnavy.blogspot

Robert

Hi Robert,

Thanks for the kind compliment, and the link to your excellent blog! :thumbs_up_1:
Marine propellers are indeed a difficult subject to model, and designing an accurate one requires a lot of researching, plus a good CAD software. I've been using Autodesk's new Fusion 360 program for a while, and it is a huge improvement over the old 123D Design. However, I'm still unable to replicate the non-constant blade thickness feature, resulting from the lack of very detailed cross-sectional drawings. But at scales like 1/200 - 1/350, the minimal printable thickness would already surpass the thickest blade sections.


Cheers,

Aur
Post Posted: Fri Apr 06, 2018 10:34 am
  Post subject:  Re: 3D print screws  Reply with quote
Hi Aur,

your propellers look very good. :thumbs_up_1: I know how dificult it is to design nice propellers.
I've done several test prints at shapeways too, all designed with Blender. (My main field of interest is the german imperial navy)

Currently I'm waiting for my first print in in HP Nylon (PA12).

Strong & Flexible is too rough and weak, in my opinion.

I was impressed of the "raw brass" and "frosted extreme detail" quality. :woo_hoo:



In my small blog I've described my approach (in german but google translation works well :cool_1: )
3dnavy.blogspot

Robert
Post Posted: Fri Mar 09, 2018 4:35 am
  Post subject:  Re: 3D print screws  Reply with quote
Hi all :wave_1:

I've created a rescaled version of the Iowa screws in 1/200 a while ago, and thought I should post it here. Thanks to the microfilm extract posted by Bigjimslade in the CASF thread, I was able to redesign a more accurate hub. I've also redone the blades to fit the new hub, as well as minimizing minor issues here and there.

Design screenshot:

Image

Shapeways render (Frosted detail plastic):

Image

I tried thickening the blades and putting sprues on each pair (reducing shell count), and the model passed Shapeways' precious metal requirements.

Polished brass render:

Image

Polished bronze render:

Image

Although these look quite good, their price is very high as a result of the complicated process of metal printing, which can be read here: https://www.shapeways.com/materials/bronze

Bronze models are fabricated using a complex five-step process. First, the model is printed in wax using a specialized high-resolution 3D Printer. It is then put in a container where liquid plaster is poured in around it. Once the plaster sets, the wax is melted out in a furnace, and the remaining plaster becomes the mold.

Molten bronze is poured into this mold and hardens quickly. The plaster is broken away, revealing your model. Raw Bronze is briefly tumbled. Polished Bronze is carefully cleaned and hand-polished. Please be aware that polishing can wear down very fine details and edges.


I've also scaled the set back to 1/350 to update the product, and it involved quite a bit of work.

Render:

Image

All these items can be found on our Shapeways shop by the name Aop_Aur

My next project on the line could be a screw set for the North Carolina-class battleship, which I already have the necessary data (pitch and diameter). I would be able to draft the blade outline from photos, and the same thing goes for the hub profile if there is no available drawings for it. Since there's not a lot of resource for these ships on the internet, I would appreciate anyone providing photos, drawings, or any sort of references for this.


Cheers!

Aur
Post Posted: Thu Mar 08, 2018 9:51 pm
  Post subject:  Re: 3D print screws  Reply with quote
Miguel wrote:
Nice job Aur :thumbs_up_1: , those propellers look really beautiful

Thanks for the compliment, Miguel! I hope they would make good replacements for the kit parts.
Post Posted: Wed Jan 17, 2018 2:35 pm
  Post subject:  Re: 3D print screws  Reply with quote
Nice job Aur :thumbs_up_1: , those propellers look really beautiful
Post Posted: Tue Jan 16, 2018 8:24 pm
  Post subject:  Re: 3D print screws  Reply with quote
:wave_1:

We've been very busy for the past month with our piano audition preparations, and the auditions themselves that were done 4 days ago here in Bloomington, Indiana. The entire process was very tiring, so we hope we'll be given the good opportunity from the University this time.

The Iowa screws were left to collect dust for the whole month, so I decided to finish the refining stages to be able to finally paint them when we return to Thailand tomorrow.

The primed surfaces were sanded to almost bare resin:

Image

With another coat of primer and 2000 grit sanding, the screws were done and ready for the snow....

Image

The next step would be the same as what I did to the Tirpitz screws - a black base coat, followed by bronze and gold colours, and perhaps weathering.
We still need to "buy these screws an Iowa-class kit" (weird enough! :heh:) , so we'll have to wait and see how it'll end up looking like with the future build.

I'm planning to create a scaled up version in 1/200 for 3D printing as well, since the Trumpeter kit parts don't look so good. That would have even thinner blades and finer detail as the scale allows, but I'll have to find the time to make the adjustments.

I'm also experimenting with HMS Hood screw, but so far the required data is not yet sufficient for a good outcome. The supercarrier screw is also lacking necessary info to begin work. As always, if anyone has any useful data for these screws or any other, please share!


Cheers, and Happy new year!

Aur
Post Posted: Tue Jan 16, 2018 6:40 pm

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