Bruce Macbeth Engine, European Version

[fumopuc]

Ups - at least you found it before plumbing the whole show .... and it just shows that the Interference Check in the CAD program is a very useful feature if used .... We have all been there ....

Nice progress nonetheless 

Hi Per, thanks.


I took the opportunity to get a view into this collision check tool in Fusion360 now.
Sure a strong and useful tool, but I think it is for more complex situations useful than my belt here against the pedestal.
If you see the picture below, the place/contact is clearly marked and recognized.
But to be honest, it was also clearly possible to recognize it by a direct view into this area.
So I still see here the human factor as the main reason for the failure.
 

[fumopuc]

Nice work around Achim, no one will ever know......or will we? 

Dave

Hi Dave, I know you all will forget it.

[fumopuc]

Another small detail done, the crank case breather.
Done very easily and mainly by a 3/16"  90° elbow casting from PM.

[fumopuc]

Hi everybody,
another, for me tricky issue, the Hall sensor and its adjustable position.
Doug Kelley recommended to give the ignition impulse by the crank shaft and not by the cam shaft.
The reason I could imagine is the wiring.
The distributor, another option to place the Hall sensor like the Snow engine or other model engines use it, is far away at the top of the engine at cylinder #4.
A high voltage cable has to go up there already, to combine this with the cable from the sensor, sure is not the best idea.
So the wiring should be done in two separated cable routes, also not a good idea for appearance.
I assume this all was the reason for Doug to use the fly wheel with two magnets as the master for ignition timing.
The only other information from his drawings is, that his engine is working by a ignition set up with 5° before BTDC. 
So I had to switch on the CAD and to design a adjustable bracket for the Hall sensor.
The result could be seen below at the pictures.
It is designed for CNC manufacturing and the CAM is done also already.
Something about 27.300 lines of G-code, picture of the simulation attached below.

[Roger B]

I can see the logic in triggering from the flywheel rather than mixing the LT and HT wiring especially when using a Hall sensor. Conventional contatct points are much less at risk from stray voltages.

[fumopuc]

The computer has machined the sensor bracket in the meantime.


Hi Roger as you mentioned it, sure the right way to do it.

[Don1966]

Still with you Achim lovely work enjoying it.




 
Don

[fumopuc]

Thank you Don.


Next task, a hole to the sensor into the pedestal and two holes in the fly wheel for the in brass bushes fixed magnets.

[fumopuc]

Hi everybody, I have started to give it some color now and the spray booth was pulled out of the shelf.


That means, that some fiddling things has to be sorted out also, i.e. position and fixation of the ignition system.

A bracket, to keep the AA cells in position, but changeable from below has been designed and 3D printed.

[Roger B]

Very neatly laid out  I like your material storage racks   

[fumopuc]

Roger, thank you very much.


6 weeks ago I have made this here also for bars and tubes up to 1 meter length.
Very useful If you can see it all with nearly one view.

[Admiral_dk]

Nice result Achim 

It looks like you are using a "Meat Thermometer" in the oven with the powder coated subjects - how do you use it excatly ?

[fumopuc]

Hi Per, thanks.

This discounter oven thermometer will be used to check the general temp inside the oven.
If gives me an idea about the conditions inside the oven after preheating, something between 180°C and 200°C is a good value to start.
The coated part should get a temperature of 180°C for 15 minutes.
Before any coating, it is important to get any oil out of the holes in a part.
For this job another discounter offer is used, a small ultrasonic cleaner.
Some hot water with 2 to 3 drops of dishwashing liquid are very helpful here.
To check the real temperature of the parts in the oven and during cooling down, I do use an Infrared-Laser-Thermometer.

[Jo]

Hi Achim,

  When I saw the thumbnail view I thought your Ultrasonic cleaner it looked like something from the bathroom in your workshop. I am pleased was wrong 

Jo

[kvom]

I assume that the oven job is powder coating.