another Snow engine

[Dave Otto]

I second what Roger said.

Great progress Achim; are the rocker arms going to give the CNC a work out?

Dave

[fumopuc]

Vince, Kim, Don, Joe, Hugh, Roger and Dave thanks for checking in and given friendly comments.

Yes Dave, my plan is to make the rocker arms, rocker arm brackets and cams with the help of CNC.
Also the drilling operation in the valve cage for the fixation at the combustion camber will be an CNC issue.
First will be the cams. Until today I have never made steel swarf with the little CNC mill, so a new adventure will comming soon.

[fumopuc]

Hi Everybody, life has provided me a few special tasks lately, so I was a little distracted.
But now some little progress at the Snow build again.
I have made a shaft coupling for the cam shaft, so it could be possible later, to disassemble the the cylinder unit from the sub base by disconnecting the the con rod and the cam shaft. Some easy parts, but I have enjoyed my new 5C collet chuck.
And I got a new discounter baking oven thermometer, very low investment but useful.

[zeeprogrammer]

Coming along great.
Love the detail and coloring!

[Roger B]

That's a neat flange    I expect you will find it very useful when you come to setting the engine up and getting it to run 

[fumopuc]

Coming along great.
Love the detail and coloring!

Hi Zee, thanks.

[fumopuc]

That's a neat flange  I expect you will find it very useful when you come to setting the engine up and getting it to run 

Hi Roger, thanks. Yes I hope all these details will help to get it running.
In the meantime the cams are made. I thought a good job for the little Proxxon CNC mill.
First a simple CAD drawing and than some playing with the CAM program.
Until now I have never used a 6 mm cutter in steel with my CNC, so I have been very carefully. It is moving in 1,1 mm steps into the steel disk when following the outline.(1300 rev/min and 60 mm/min feed rate)
First there is a 6 mm roughing cutter working, leaving 0,035 mm overstock, cutting against the feed.
Next a normal 4 flutes 6 mm cutter, in climb modus, is cleaning the surface in one go around.
To check everything I have started with a sample part from aluminium.
Currently everything is in the tumbler for polishing.

[Kim]

Nice CnC work on the cam Achim!  And I like your powder coating too.  That shaft coupling looks very sharp!
Kim

[b.lindsey]

I am just getting caught up on your thread Achim. You are still making some fine progress on this beautiful engine and the motion does seem very smooth as others have said.

Bill

[Don1966]

Achim it's good to see more progress on this beauty. The coupling and cam came out great and love the oven. I had bought on a while back to bake out transformers and small motors. It has a convection fan and the thing works great for baking out things and drying paint.

Don

[Dave Otto]

Nice Update Achim,

The shaft coupling and cams turned out great!

Good to see progress.
Dave

[fumopuc]

Kim, Bill, Don and Dave, thanks for checking in.
It is good to have you all still with me. I have some days off, so a good opportunity to finish the cams.
There are two M 2,5 mm grub screws in each cam to fix it at the shaft and to adjust the timing.
Again a good opportunity to use the square collet block with a little self made fixture, because the angle from bore to bore is 90°.
Also some tiny grooves were made to the shaft, exactly where the cams are placed at the shaft.
At the end again a sample assembly.

[fumopuc]

... and the whole story in motion



<a href="https://www.youtube.com/watch?v=fODYDxGSi0g" target="_blank">http://www.youtube.com/watch?v=fODYDxGSi0g</a>

[vcutajar]

Thanks for the update Achim.  Still following along.  Not long now for the first run.

Vince

[Kim]

Thanks for the video Achim, your Snow is looking great!
Kim