Start on a Kiwi ic engine.

[vcutajar]

Tjark

You are not far off.  Good luck on your next try.  Bye the way, did you make the boss for the oil inlet?  Below are a couple of photos of the casting I hade for the front part of the crankcase.





Enjoy

Vince

p.s.  If you are in the mood you can also do a boss for the oil drain hole.

[Tjark]

Vince and Jo, thanks for the photo’s  yes I realized that I forgot this one.
Have to modify the pattern, not a big issue.

    Tjark.

[Jo]

Another thought... The front crankcase spigot is left over length to allow for a chucking piece for machining the back  .

Jo

[Tjark]

Jo, nice that you noticed the differents in the  spigot.
But i have made the front case spigot longer then needed.
I also made the spigot over the hole length tapered.
So it will release easy from the forming sand.
At the inside off the crankcase I made an extra piece off  round aluminum in the middle off the bearing place, you can see it in the picture.
So I can clamp it short on the crankcase wall.
So I will work the other way, I clamp the crankcase first at the inside to machine the spigot this way to a parallel round piece for clamping later.
Also I can center the spigot, this is not possible when clamping first at the spigot.
Out off experience I know that clamping on castings can get you in a lot off trouble and I hope to overcome those this way.

   Tjark.

[Coopertje]

Nice work Tjark! It will be my next step too to try casting after I have my machines finished including the accecoires. Takes a lot of time to finish that last 20%.

Is this your first experiance with casting? Can you post a picture of the funish you use?

Thanks, regards Jeroen

[Coopertje]

Just found your thread on the how to on casting.... Thanks for sharing!

Jeroen

[Tjark]

Jeroen, I have started casting around 2006 / 7.
Bought a furnace from someone who casted a lot off years  for hobby and switched to a electric furnace.
The furnace I use is a home build charcoal furnace.
It took some time to get the casting right, mostly I had shrinking problems.
Then I bought a book who was written by  CW Ammen called Casting Aluminum and there I saw the light.
When you like to make a start with casting aluminum I can recommend this book.


   Tjark.

[Coopertje]

Thank you for the tip on the book Tjark. I will order it and start to  :happy reader: I hope that when I really start casting I can pass by one day, think we are not that far apart, and watch you do a cast. That would give me quite a jumpstart!

Looking forward to your progress on the Kiwi.

Jeroen

[Tjark]

Jeroen, that will be no problem.
I have made today some test castings again, with the modification Vince pointed out.
The castings are getting now almost to the end stadium so I can cast some crankcases who are worded to get a heat treatment.
Have also made a tryout off the machining  I had in mind.
It looks that all is coming together this way.
First picture ; new casting with modification Vince pointed out.
Second picture ; inside boss for clamping the first time.
Third picture ; Spigot turned
Fourth picture ; Insite turned, don’t look at the casting flaws.
                       Those failures are due to old molding sand what loosen up when molten aluminum  is poured.
Fifth picture ; After milling the cylinder base the top is completely square to the base.


   Tjark.

[vcutajar]

Good going tjark.  That looks better.

Vince

[fumopuc]

Hi Tjark, that is impressive. Do you have also some pictures of your back yard foundry ? Following along.

[Tjark]

Achim , I have made a thread where you can see a part off my backyard foundry.

http://www.modelenginemaker.com/index.php?topic=3410.0


   Tjark .

[ths]

Achim , I have made a threat where you can see a part off my backyard foundry.

http://www.modelenginemaker.com/index.php?topic=3410.0


   Tjark .

Tjark, I think you probably mean 'thread' instead of 'threat'. It's one of those times when the transposition of a letter changes the meaning of the word entirely, and not always for the best. Your project is, by the way, an absolute treat.

Cheers, Hugh.

[Tjark]

Hugh, here you can see that English is not my native language.
You are right sometimes one letter brings up something stupid,  and words not intended.
Thanks for the correction.


   Tjark.

[fumopuc]

Achim , I have made a thread where you can see a part off my backyard foundry.

http://www.modelenginemaker.com/index.php?topic=3410.0


   Tjark .

Hi Tjark, thanks for pushing me into the right direction. I like these back yard foundries. May be one day I can do this too.