Author Topic: Ohrndorf V12, new challange  (Read 3883 times)

Offline fumopuc

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Ohrndorf V12, new challange
« on: April 16, 2024, 04:26:08 PM »
Hi Everybody,
as already mentioned earlier, a V12 designed by M.Ohrndorf will be my next challenge.
When I have started model engineering in 2008 or 2009 my dream was to build a V8 or V10 some day.
Now some years later I feel good to start such a project.
In 2008 it has been the book of Mr. Schillings, which was the one day model I have been focused on.
After some years passing now, I have changed my mind, because this Schillings or Luther V8 or V10 does hide all the moving parts inside and under covers.
Only visible action is a ruining belt.
Totally different, the design of Mr Ohrndorf.
The engine is air cooled and all the rockers, springs and  push rods are visible in their motion.
So it will be a V12 instead of a V8 or a V10.
It took some time to check, if my machines will be able to cover all the necessary operations, but it seems to match.
It will be tight but I am full of hope.



Kind Regards
Achim

Offline fumopuc

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Re: Ohrndorf V12, new challange
« Reply #1 on: April 16, 2024, 04:33:10 PM »
Today I have started to make the fixture for the crankcase.
It is a bit special, because of the necessary action to use the crankshaft center line as a origin for all machining.
But after two days working, there are a lot of chips at both milling machines and we have the first real parts of the crankcase fixture.
« Last Edit: April 16, 2024, 07:23:42 PM by fumopuc »
Kind Regards
Achim

Offline Vixen

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Re: Ohrndorf V12, new challange
« Reply #2 on: April 16, 2024, 04:46:49 PM »
Hello Achim,

Welcome to your new project :hi:

A V12 is an ambitious undertaking, lots of repetitive cylinder and valve gear stuff. CNC will be a great help with that.

The crankcase fixture looks good and robust, a sound basis for accurate work. Will the crankcase fixture also double up for the crankshaft?

Cheers

Mike
It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline gerritv

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Re: Ohrndorf V12, new challange
« Reply #3 on: April 16, 2024, 06:19:28 PM »
That is a fascinating engine. We share some machinery similarities, it will be fascinating to follow your build.

gerrit
Don't confuse activity with progress

Offline Roger B

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Re: Ohrndorf V12, new challange
« Reply #4 on: April 16, 2024, 06:51:13 PM »
That's a fine challenge Achim  :ThumbsUp:  :ThumbsUp:  :wine1: I am used to checking all the dimensions against my machines as well  :thinking:
Best regards

Roger

Online Kim

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Re: Ohrndorf V12, new challange
« Reply #5 on: April 16, 2024, 11:00:28 PM »
Looking forward to watching your new project grow, Achim!   :popcorn: :popcorn:
Sounds very exciting!

Kim

Offline RReid

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Re: Ohrndorf V12, new challange
« Reply #6 on: April 17, 2024, 12:28:30 AM »
Hi Achim. I agree with your reasoning about choosing this engine. I too like to see as much of the mechanical motion out in the open as possible. A big project, I will enjoy following along with your progress! :popcorn: :popcorn: :cheers:
Regards,
Ron

Offline crueby

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Re: Ohrndorf V12, new challange
« Reply #7 on: April 17, 2024, 01:29:23 AM »
Sounds like an impressive engine!  Do you have a picture of what it will look like?
Watching along!

Online Art K

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Re: Ohrndorf V12, new challange
« Reply #8 on: April 17, 2024, 03:18:19 AM »
Achim,
This looks like a very challenging, and interesting project!
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King

Offline fumopuc

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Re: Ohrndorf V12, new challange
« Reply #9 on: April 17, 2024, 08:23:33 AM »
Hello Achim,

Welcome to your new project :hi:

A V12 is an ambitious undertaking, lots of repetitive cylinder and valve gear stuff. CNC will be a great help with that.

The crankcase fixture looks good and robust, a sound basis for accurate work. Will the crankcase fixture also double up for the crankshaft?

Cheers

Mike


Mike, thanks for watching.
The crankshaft is made from several equal segments.
Similar to the Schillings design, but with smaller bearings.
It will make sense to do the assembly in the crankcase already.



Kind Regards
Achim

Offline fumopuc

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Re: Ohrndorf V12, new challange
« Reply #10 on: April 17, 2024, 08:30:51 AM »
Sounds like an impressive engine!  Do you have a picture of what it will look like?
Watching along!


Hi Chris, thanks for popping in.
here are some pictures and videos also.
https://www.engineman.de/product/plan-12-cylinder-v-engine/?lang=en
There was a video of an American guy at YouTube, showing a test run at a show, but I canīt find it anymore.



Kind Regards
Achim

Offline fumopuc

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Re: Ohrndorf V12, new challange
« Reply #11 on: April 17, 2024, 08:34:22 AM »
Gerrit, Roger, Kim, Ron and Art, thanks for following along.
Go to know, that you are all with me, but be prepared, it will be a long and hard journey.
Kind Regards
Achim

Offline fumopuc

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Re: Ohrndorf V12, new challange
« Reply #12 on: April 17, 2024, 01:44:16 PM »
Another day with boring fixture work.
The two vertical supports have been drilled and reamed as a set together.
Some pieces of Aluminium from the scrap box haven been used for the final support.
The center also drilled and reamed as a clear reference for the vertical support.
Luckily I have get it manged here it to get a nice slip fit.
Kind Regards
Achim

Offline fumopuc

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Re: Ohrndorf V12, new challange
« Reply #13 on: April 17, 2024, 01:51:48 PM »
First time the whole story on its own feet.
Next step will be to transfer the hole pattern to the round support and make the 3 time M6 threads each side.
If this is done, I can remove the center pin and the hole will be ready to receive a M10 thread rod for general clamping.
Kind Regards
Achim

Offline crueby

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Re: Ohrndorf V12, new challange
« Reply #14 on: April 17, 2024, 02:12:01 PM »
Sounds like an impressive engine!  Do you have a picture of what it will look like?
Watching along!


Hi Chris, thanks for popping in.
here are some pictures and videos also.
https://www.engineman.de/product/plan-12-cylinder-v-engine/?lang=en
There was a video of an American guy at YouTube, showing a test run at a show, but I canīt find it anymore.
Wow - thats fantastic!

 

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