Mills 1.3

[Ghosty]

Why do the connecting rods look gray in the middle. Is that tape?

vtsteam,
No its just the way the light reflected of the milled surface.
Cheers
Andrew

[Ghosty]

Hi All,
Finished of machining of the crankshaft today.
First machined up a jig to hold the crankshaft with correct offset for big end.
Fitted crank in jig and then machined the big end to suite the conrod.
Then moved assembly to the mill to machine the crank webs.
Cheers
Andrew

[Roger B]

Excellent work on some tiny pieces    The ruler next to the conrod bought home to me how small these engines are 

[Admiral_dk]

Fine looking Cranks and Rods 

So contrapiston, piston and pin left to do or ...?       

Per

[Ghosty]

Hi All,
Thanks for the kind words from you all.
Yes Admiral_dk, only the squeezy bits to do, hope to get them done on one engine today.

Cheers
Andrew

[Ghosty]

Hi All,
PROBLEM:-  Getting small diameter cast iron round bar.
             FIX:-  Make your own.

I have some 40mm(1.575") round bar, cut length off of it, I have a 1mm(0.040") slitting saw, cut the round bar into quarters.
Pieces almost triangular, fit into 3 jaw and machine round.
Now have a piece almost 14.5mm(0.565") in dia, A lot less waste that machining the 40mm bar down to size, and I also have 4 pieces.
Now to make the pistons.
Cheers
Andrew

[Kim]

A pretty ingenious way to get smaller round CI!

Kim

[crueby]

Now that's thinking!

[Ghosty]

Kim, creuby,
I just thought there had to be a way to get smaller dia cast iron, my supplier can only supply 30mm as smallest, I had the 40mm on hand as I used it for liners on another engine I built. Done a couple of quick measurements and away I went.
Had to do the same with some bronze bar to get material for some conrods.
Cheers
Andrew

[Ghosty]

Hi All,
Up until now I have been making the parts for two engines. Now I will be working on just one engine at a time.
Started the most exacting part of the build. Started with lapping the cylinder, very messy part of the build.
Then machined and fitted the contra piston to the cylinder.
Then from the same blank, I machined the piston and then lapped for fit in cylinder, more mess.
Then cleaned in ultrasonic cleaner and then assembled complete engine.
We are almost there, now on to the starting bit before finishing the other engine.

Cheers
Andrew

[vtsteam]

I've learned a lot through your build.

What are the dowel pegs for in the last photo?

[Ghosty]

I've learned a lot through your build.

What are the dowel pegs for in the last photo?

Glad that it helped, you will learn a lot through sites like this.
Had a couple of coach bolts come loose, they hold up the TV antenna, unscrewed the bolts, inserted a couple of the dowels refitted bolts, nice and tight.
Cheers
Andrew

[Ghosty]

Hi All,
Well after a little bit of playing around, "IT'S ALIVE", After about 20mins of runtime now it's swinging a 9x6wide blade with no problems.
Now on to the other engine.
Cheers
Andrew

<a href="https://www.youtube.com/watch?v=b878EoPAqq4" target="_blank">http://www.youtube.com/watch?v=b878EoPAqq4</a>

[jcge]

What a great little engine and build log - congratulations Andrew.
Would you mind sharing what fuel you are using ?
Regards
John

[Ghosty]

John, just 1/3 castor, kero, ether.

Hi All,
What is better than one engine running, how about in stereo. Sorry no sound until 1:40min
Cheers
Andrew

<a href="https://www.youtube.com/watch?v=u8g5T1yJdps" target="_blank">http://www.youtube.com/watch?v=u8g5T1yJdps</a>