Author Topic: Bruce Macbeth Engine, European Version  (Read 76276 times)

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #480 on: April 23, 2021, 07:43:03 AM »
Hi everybody,
and here some swarf from making the camshaft brackets with the 4th axis.
This video tries to show the choreography of the 4th axis operation.
So manly the movement and not the milling is shown.
<a href="https://www.youtube.com/watch?v=BLVP2DK7ycA" target="_blank">http://www.youtube.com/watch?v=BLVP2DK7ycA</a>
Only the short facing operations at the end have also captured some milling.
Kind Regards
Achim

Offline Roger B

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Re: Bruce Macbeth Engine, European Version
« Reply #481 on: April 23, 2021, 01:42:22 PM »
That's some fine CNC gymnastics  :praise2:  Do you bring the X axis back to the reference point each time you rotate the 4th axis?
Best regards

Roger

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #482 on: April 23, 2021, 04:12:49 PM »
That's some fine CNC gymnastics  :praise2:  Do you bring the X axis back to the reference point each time you rotate the 4th axis?


Hi Roger,
we do have 14 different tool paths here.
Each new tool path starts with the referencing of X,Y,Z and A.
This is the normal reason for the movement of all axes before a new job starts. 



Kind Regards
Achim

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #483 on: May 07, 2021, 07:02:36 AM »
Hi everybody,
the cam shaft bracket with distributor adapter was made next.
Same procedure as done before but with a light design change.
And the finish of the overall shape with hole pattern.


Kind Regards
Achim

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #484 on: May 07, 2021, 07:05:31 AM »
... and some more pictures.
Kind Regards
Achim

Offline Admiral_dk

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Re: Bruce Macbeth Engine, European Version
« Reply #485 on: May 07, 2021, 11:56:20 AM »
Impressive parts - but why did you not let the CNC do the holes in those parts ?
I mean - that would ensure total accuracy with regard to placement and angles ....
Yes you would have to change tool, to do the final 'Reaming' for the axle, but ....

Per

Offline Don1966

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Re: Bruce Macbeth Engine, European Version
« Reply #486 on: May 07, 2021, 02:04:55 PM »
 :Love:



 :drinking-41:
Don

Offline Roger B

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Re: Bruce Macbeth Engine, European Version
« Reply #487 on: May 07, 2021, 09:07:33 PM »
 :praise2:  :praise2: What is the extra piece on the left hand bracket for?
Best regards

Roger

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #488 on: May 08, 2021, 08:46:20 AM »
Kind Regards
Achim

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #489 on: May 08, 2021, 08:47:27 AM »
:praise2: :praise2: What is the extra piece on the left hand bracket for?


Hi Roger, that should be the new home of the distributor.
Thanks for watching.

Kind Regards
Achim

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #490 on: May 08, 2021, 09:05:49 AM »
Impressive parts - but why did you not let the CNC do the holes in those parts ?
I mean - that would ensure total accuracy with regard to placement and angles ....
Yes you would have to change tool, to do the final 'Reaming' for the axle, but ....

Per


Hi Per, I do trust the CNC 100% too, but I do not trust the lathe and conventional mill operator afterwards. :mischief:
To do the set up for the flat surface machining aligned proper to the  cam shaft holes is not as easy.
So my decisions was  here to go the idiot proofed way.
First: general shape.
Second: flat surface as reference.
Third: cam shaft holes aligned to the flat surface.
So I have modified an old fixture for the next mill set up.
The brackets now clamped in the same way as fixed to the engine.
In my eyes the best way to archive same position of cam shaft bearing in all 4 brackets.
 
Kind Regards
Achim

Offline Vixen

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Re: Bruce Macbeth Engine, European Version
« Reply #491 on: May 08, 2021, 10:58:30 AM »
Achim,

I always admire your skills and love the way this engine is coming together.  :ThumbsUp: :ThumbsUp: :ThumbsUp:

Two questions?

What screw threads are you using? I ask, because the nuts have nice proportions. Small metric nuts are all the wrong shape for models. They are intended for ease of tightening and not for looks.

Have you anodised the cylinder heads? They look great

Mike
« Last Edit: May 08, 2021, 11:41:59 AM by Vixen »
It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #492 on: May 08, 2021, 07:04:45 PM »
Achim,

I always admire your skills and love the way this engine is coming together.  :ThumbsUp: :ThumbsUp: :ThumbsUp:

Two questions?

What screw threads are you using? I ask, because the nuts have nice proportions. Small metric nuts are all the wrong shape for models. They are intended for ease of tightening and not for looks.

Have you anodised the cylinder heads? They look great

Mike


Hi Mike, thanks. And me too does admire your skills in model engineering.


The cylinder heads are fixed now with M3 ISO nuts. A black type is under the bench already.
The attempt with "Modellbaumuttern" failed. https://www.modelenginemaker.com/index.php/topic,7527.msg235023.html#msg235023
Most of the screws and nuts at these engine are metric "Modellbauschrauben" and "Modellbaumuttern", M1.6, M2, M2.5, M3.
Here a German source with dimensions https://knupfer.info/shop/index.php/deutsch/modellschrauben-schwarz.html


The cylinder heads are brass, MS58, with a slight patina so far. They will get a light grey powder coating soon.

Stay healthy.

Kind Regards
Achim

Offline Vixen

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Re: Bruce Macbeth Engine, European Version
« Reply #493 on: May 08, 2021, 07:51:23 PM »

Most of the screws and nuts at these engine are metric "Modellbauschrauben" and "Modellbaumuttern", M1.6, M2, M2.5, M3.
Here a German source with dimensions https://knupfer.info/shop/index.php/deutsch/modellschrauben-schwarz.html


Achim thanks for your reply. The special fastners from your supplier are very well proportioned and look correct on model engines. I shall use these when I am ready to finish the W165 engines.

Unfortunately the fallout from Brexit had made importing stuff from Germany much more expensive. Suddenly many suppliers and their shipping companies are adding special surcharges and then there can be import duty and more VAT taxes to pay.  Perhaps, one day, I will ask you to buy some of these nice nuts and bolts and post them to me.

Mike
It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline Admiral_dk

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Re: Bruce Macbeth Engine, European Version
« Reply #494 on: May 08, 2021, 09:43:26 PM »
Quote
Unfortunately the fallout from Brexit had made importing stuff from Germany much more expensive. Suddenly many suppliers and their shipping companies are adding special surcharges and then there can be import duty and more VAT taxes to pay.

That also goes the other way Mike. I had to order some tools for my big bike from the UK, and I had to pay for two shipments, even though the British company promises that everything on the same order goes out on one shipment charge and in one package .... it was shipped a in two parcels with minutes in between  :censored: .... and just to make it worse - I had to pay Customs handling fees twice for that reason  :Mad: .... and all that meant several weeks delay in Customs  :cussing:
So absolutely NO reason to EVER buy British again .... Shame as I had good experiences before Brexit ....

Thank you for your reply Achim - I do understand your argument.

 

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