Bruce Macbeth Engine, European Version

[Admiral_dk]

I think that Roger nailed it with his comment and I do hope that you end up with a satisfying result 

[fumopuc]

Little problems add up to become bigger problems    I'm glad you got it sorted out     As the water will be flowing from the smaller bore to a larger one I don't think you will see much loss of flow.

Hi Roger thanks for watching.
I also think there will be no real reason to worry about any "cavitation pitting".

I think that Roger nailed it with his comment and I do hope that you end up with a satisfying result 

Hi Per thanks for watching also. Good to know that you are following along.

Next job was to make the fake governor.
Picture 04 is documenting the evidence that you have to give the computer a clear advises what to do, otherwise the result will be nor what you respect.


The whole assembly was soft soldered in the discounter oven, everything work fine, with exception of the two balls. The gas coming out of the flux, kicked the balls of the pins. So had I to fix this in a separate operation afterwards.

And some motion.
[youtube1]https://youtu.be/WaudgPCbGdE[/youtube1]

[fumopuc]

Hi everybody,
next job, the coolant manifold.
Some flanges and a pipe. 
The flanges partly done with the CNC mill and also with conventional machining.

[fumopuc]

Hi everybody,
some more progress with the coolant manifold and an imperial vs. metric created minor problem.
The hole pattern was predrilled by CNC and finished by conventional drilling manually, in my understanding, with a better feeling for the 1,6 mm drill.
At the first sample assembling, I realized, that the metric M 1,6 mm bolt does have a bigger head than the imperial 0-80 inch bolt, recommended for this fixation.
In the last picture a CAD comparison of both types, in front the metric bolt 1,6 mm bolt.
Why does it takes so long to recognize this ?
The bolt models are available and a proper CAD software to check it also ?
These are the questions I have to discuss with the guy typing this post currently.


In my head is a solution already, but this will be done after the soldering.

[scc]

       Terry

[fumopuc]

Hi Terry, thanks for watching.


Next necessary job, the soft soldering of the manifold.
To do it in place at the engine was not a good idea.
The brass flanges are also fixed by soft soldering to the cylinders, so I would like to avoid any damage there.
A simple easy to handle fixture was necessary.
To get the real distance between each cylinder, included the already created minor deviations, I have put some dowel pins into the assembled cylinders at the engine and did a proper measurement.
By this distances a new sketch was created in Fusion360 and the computer has done the drilling into a bar.
Soft soldering was quite easy now.
Now the problem with the to big bolt heads had to be solved.
A member of our German forum has pointed me into this direction, shown in picture 20.
I had to take of something about 0,3 mm of the flange material
So no big deal but all the bolts a easy to assembly now.

[Roger B]

Good solution     0-80 is nearer M1.5 than M1.6.

[fumopuc]

Hi Roger, yes theoretical.
Model engineering bolts or in accordance with the European ISO Standard, you will get easily
M 1
M 1,2
M 1,4
M 1,6
M 2 
so my choice was M 1,6, because these tapes and dies are available in my shop as smallest size.


Nice progress with your SU carb.
If you are searching for other springs, I can recommend the Gutekunst Online Shop.
i.e a spring with 0,3 mm wire.




 

[gbritnell]

Hi Achim,
The engine looks great! I have also made many assembly fixtures for soldering pieces together. It's better than ruining work that has taken many hours of work. It's strange that the smallest taps and dies you can get is M1.6. Over here in Imperial land I can get all the way down to M1.0x.25.
gbritnell

[fumopuc]

Hi Achim,
The engine looks great! I have also made many assembly fixtures for soldering pieces together. It's better than ruining work that has taken many hours of work. It's strange that the smallest taps and dies you can get is M1.6. Over here in Imperial land I can get all the way down to M1.0x.25.
gbritnell

Hi George, thank you very much.


I think there is a kind of misunderstanding.
My intention was to express, that the from Roger mentioned size M 1,5 is not common and not to by of the shelf here.
M 1,6 and M 1,4, also down to M 1, as mentioned above is no problem.


Specially in my case, the set of M 1,6 taps is available in my tools box, but no smaller sizes so far.


Waiting for the next pictures of your "yellow mini monster".


Stay safe.
 

[Craig DeShong]

Hi Achem.  Your engine looks outstanding.  I’ll agree in that making fixtures to assist difficult tasks is tedious but as we can see from the result here, it’s well worth the effort. 
 

[fumopuc]

Hi Craig, thanks for watching and the friendly comments.
And yes, fixtures are mostly more work as the parts they are supporting.
Can be seen again in some days, because the fixture for the stairs of my service platform is under design currently.



Next to, the covers for the fake cleanout doors.
Another job for the CNC mill.

[scc]

Looking good Achim    Terry

[fumopuc]

Hi Terry, thank you very much.
I am following your slide valve mill engine with interest.

[scc]

Cheers Achim,  I didn't think anyone was       Terry