Bruce Macbeth Engine, European Version

[fumopuc]

Hi everybody,
a new chapter, cooling circuit.
The pump is of my store.
Last time, when I have made the pump for the Opposed Twin, I have made a batch of three.
Nearly finished machined.
Inlet and outlet pipes are missing, the pulley and the outlet machining in the pump housing also.
A proper pedestal, allowing some adjustable belt tension is missing also.
So the CAD has to be started.

[Roger B]

Coming along nicely    Where are the cast pipe fittings from? I need to try a centrifgal pump next, I have gear and diaphragm versions 

[fumopuc]

Coming along nicely  Where are the cast pipe fittings from? I need to try a centrifgal pump next, I have gear and diaphragm versions 

Hi Roger, thanks.


Cast fittings are from PM.
https://www.pmmodelengines.com/shop/pipe-fittings/unmachined/casting-trees/
Also available in the U.K.
https://www.forest-classics.co.uk/pm-research/pm-fittings

[Craig DeShong]

I love the detail you’re adding to this engine.  It's making this model so extraordinary.

[fumopuc]

Hi Craig, thanks for the friendly comments.


The new pedestal is now part of the CAD model, it is adjustable by +/- 2,5 mm, 5 mm over all.
I also took the opportunity to get everything virtually in situ, so that I was able to get a belt on the pulleys.
The analysis of the sketch in Fusion 360 has shown a virtual length of 350,6 mm for the belt.
This type of flat belts are available in 10 mm steps, so I have been very close to the next stock size with my first shoot.
So the belt is on order now.

[fumopuc]

Hi everybody,
this chapter should get the head line "Playing with CAD Software".
My intention was to get an impression of the final engine with some color.
So I have given the different parts and assemblies a black or grey painting.
To have in mind also, that it will be powder coated and so some special split lines should be taken in account also.

[fumopuc]

... and part two.
At the very end two clicks and the paint´is gone again, but everything saved in an older Version of the Fusion file.
I do like this CAD world very much.

[kuhncw]

Hi Achim,

Thanks for a very interesting build thread.  Very nice work.

What is the material, supplier, etc. for the belt you ordered to drive the coolant pump?



Chuck

[fumopuc]

Hi Achim,

Thanks for a very interesting build thread.  Very nice work.

What is the material, supplier, etc. for the belt you ordered to drive the coolant pump?



Chuck

Hi Chuck, thanks for watching.
The flat belt is available in Germany under the name "T150".
Here a link to a company in Italy, I am sure they will have a sales organisation in the US also.
https://megadynegroup.com/usa/products/flat-belts/rubber-megaflat
May be you will have a look at suppliers which are selling bearings, O-ring and lip seals also.
My belt has the size 350x5x1 mm.
The suppliers do have it as a kind of tube and it will be cut of to the required width.
But may be much easier for you, here a sample from McMaster-Carr, similar stuff.
https://www.mcmaster.com/flat-belts/flat-belts-6/

[kuhncw]

Achim,

Thank you very much for the belt information.  I'll check it out.

Regards,

Chuck

[fumopuc]

Hi everybody,
next step, the adjustable stand for the water pump and the fixation of the unit at the engine first time.

[kuhncw]

Achim,

That is a nice design for an adjustable mount.  Thanks.  I plan to copy it.

Regards,

Chuck

[fumopuc]

Hi Chuck, you are welcome to copy the design.




Sample assembly of the water pump.
The belt was not running in the middle of the crank shaft pulley as expected and first I did not understand why.
Crank shaft and pump shafts are parallel and the drive pulley at the crank shaft has a spherical surface.
I took me some time to recognize that I have done a not so good design job.
The belt has had a collision with the pedestal of the engine. Immediately I have had a look into the CAD model and yes same over there.
So may be next time I should use the CAD for it where is very useful, to check all parts of what you have done virtually at the screen.
In the last picture of my "playing with colours" thread, it is already clear to see, but unfortunately not to me, at that stage.


O.K. lets change something. Two options, to cut of the edge of the pedestal or to lift the pump.
The last one seems to me the more elegant solution, so the pump has get a pedestal extension by 10 mm in Z.
Now the problem is solved and the plumber can start to make the water pipe from the pump to the engine inlet.

[Admiral_dk]

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 

[Dave Otto]

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

Dave