Warbird Information Exchange

DISCLAIMER: The views expressed on this site are the responsibility of the poster and do not reflect the views of the management.
It is currently Thu Mar 28, 2024 10:51 am

All times are UTC - 5 hours


Classic Wings Magazine WWII Naval Aviation Research Pacific Luftwaffe Resource Center
When Hollywood Ruled The Skies - Volumes 1 through 4 by Bruce Oriss


Post new topic Reply to topic  [ 75 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next
Author Message
PostPosted: Tue Dec 15, 2020 7:26 am 
Offline
User avatar

Joined: Tue May 17, 2005 2:15 am
Posts: 738
Location: Misawa, Japan
That's cool, Rob. I'm glad that you don't think that you will forget the sand molds!

Mac

_________________
WWII Naval Aviation Research - Pacific
https://www.ww2nar-pac.com/


Top
 Profile  
 
PostPosted: Wed Dec 16, 2020 3:30 am 
Offline
WRG Editor
WRG Editor
User avatar

Joined: Thu Apr 29, 2004 4:43 pm
Posts: 5602
Location: Haverhill, MA & Johnston, RI
I think it's interesting so I hope you continue posting. If I thought you were spamming the forum I'd tell the owner ;)

_________________
Scott Rose
Editor-In-Chief/Webmaster
Warbirds Resource Group - Warbird Information Exchange - Warbird Registry

Be civil, be polite, be nice.... or be elsewhere.
-------------------------------------------------------
This site is brought to you with the support of members like you. If you find this site to be of value to you,
consider supporting this forum and the Warbirds Resource Group with a VOLUNTARY subscription
For as little as $2/month you can help ($2 x 12 = $24/year, less than most magazine subscriptions)
So If you like it here, and want to see it grow, consider helping out.


Image

Thanks to everyone who has so generously supported the site. We really do appreciate it.

Follow us on Twitter! @WIXHQ


Top
 Profile  
 
PostPosted: Wed Dec 16, 2020 3:58 am 
Offline

Joined: Sun Jun 02, 2013 7:42 pm
Posts: 162
lol, thanks Scott, I appreciate it.


Top
 Profile  
 
PostPosted: Fri Dec 18, 2020 8:03 pm 
Offline

Joined: Sun Jun 02, 2013 7:42 pm
Posts: 162
HEY STUDS!!!!

Image


Top
 Profile  
 
PostPosted: Wed Dec 23, 2020 11:22 am 
Offline

Joined: Sun Jun 02, 2013 7:42 pm
Posts: 162
Woohoo!!! I've finished the Crankcase assembly!

Image
Image
Image
Image
Image

You can read a little more about it on the blog and it's available for download on GrabCAD.


Top
 Profile  
 
PostPosted: Sun Dec 27, 2020 6:10 pm 
Offline

Joined: Fri Dec 07, 2012 1:50 am
Posts: 402
Location: Perth Western Australia
Looking great mate.


Top
 Profile  
 
PostPosted: Sun Dec 27, 2020 6:32 pm 
Offline
2000+ Post Club
2000+ Post Club

Joined: Tue Oct 02, 2012 7:26 pm
Posts: 2001
Location: Creemore Ontario Canada
rt, that is some beautiful work.
Thanks for sharing it.
Really impressive.

Andy


Top
 Profile  
 
PostPosted: Sun Dec 27, 2020 9:47 pm 
Offline

Joined: Sun Jun 02, 2013 7:42 pm
Posts: 162
Thanks, guys, I appreciate the support.


Top
 Profile  
 
PostPosted: Sat Jan 16, 2021 11:18 am 
Offline

Joined: Sun Jun 02, 2013 7:42 pm
Posts: 162
I've been working on the oil pan on and off for a couple weeks now but I don't have enough to post yet, but I thought I'd take advantage of my down time to upgrade my 3D printer. And of course, what is the first thing I have to print? Take a guess:

https://i.imgur.com/UPB3fkE.jpg

That's the easy way to see it, here's the hard way, sorry I can't make it any smaller.

Image

It's currently an hour and a half into an estimates 44 hour print. Wish me luck. Say a prayer to the kami of 3D printers.


Top
 Profile  
 
PostPosted: Sun Jan 17, 2021 12:29 am 
Offline
User avatar

Joined: Sat Sep 13, 2014 9:50 am
Posts: 85
One of my projects in mind is to build/3D print functional sub-scale cutaway versions of various aircraft engine models. The R-2800 might be first when I can get drawings. Keep moving forward with your project, if the print is unsatisfactory without support material.

_________________
Volunteer
Yankee Air Museum


Top
 Profile  
 
PostPosted: Sun Jan 17, 2021 8:35 am 
Offline

Joined: Sun Jun 02, 2013 7:42 pm
Posts: 162
Aaaaaaand Spaghetti.  :P  Trying again with different settings.

Chris, I have been looking for R-2800 blueprints for years, now. If you ever find a source, let me know.


Top
 Profile  
 
PostPosted: Sun Jan 17, 2021 3:30 pm 
Offline
2000+ Post Club
2000+ Post Club
User avatar

Joined: Fri Apr 30, 2004 8:11 am
Posts: 2373
Location: Montreal, Quebec, Canada
Amazing work! Thank you for sharing!

Now....I do have to ask a stupid question.

Original cast were done with sand molds.

Would this ever be machinable from a solid billet with modern technologies?

The original cast parts had a lot of machining done afterwards. But what about starting from scratch?

I know this may sound stupid......but I am curious.

Cheers! :drink3:


Top
 Profile  
 
PostPosted: Mon Jan 18, 2021 10:37 am 
Offline
Been here a long time
Been here a long time

Joined: Sun May 02, 2004 1:16 am
Posts: 11276
Michel Lemieux wrote:
Would this ever be machinable from a solid billet with modern technologies?
It might be impossible to machine hidden coolant or oil passages in a machined part. Some of the internal features may also not be suitable for machining due to access. Perhaps some parts could be machined from billet. They would certainly be stronger than a sand cast part which typically has lots of porosity.

I'd be interested to know how the 3D model, made from drawings, compares to an actual part. Sand casting can be very imprecise at times.


Top
 Profile  
 
PostPosted: Mon Jan 18, 2021 1:11 pm 
Offline

Joined: Sun Jun 02, 2013 7:42 pm
Posts: 162
No, I don't think this would be machinable in it's current form. There are a lot of areas that tools would never be able to reach. It's mostly hollow to make it as light as possible, and to be honest, I don't know how they can say with 100% certainty that they got all the sand out of it. If weight isn't an issue, you could probably make a few areas solid and machine it, but even then I am still not sure you'd end up with a functional crankcase. Fortunately, if you wanted to sand cast one, there are new tools out there that can 3D print sand molds.

Edit: sorry Michel, I typed all this out last night but forgot to hit submit.


Top
 Profile  
 
PostPosted: Mon Jan 18, 2021 1:16 pm 
Offline

Joined: Sun Jun 02, 2013 7:42 pm
Posts: 162
bdk wrote:
I'd be interested to know how the 3D model, made from drawings, compares to an actual part. Sand casting can be very imprecise at times.


Fortunately, in this case, I had a 3D scan of an original -9 crankcase given to me by a friend named Tom Kay up in Ottowa. He owns one and had 3D scanned it and various other parts and he shared those scans with me. So in this case I can say with some certainty that the two are pretty darn close. There is a tiny bit of variance that you'd expect in sand casting, but the casters did a surprisingly good job of matching the drawings. That or the drafters did a surprisingly good job of drawing up the casting.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 75 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next

All times are UTC - 5 hours


Who is online

Users browsing this forum: Google [Bot], quemerford and 80 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group