Author Topic: Bruce Macbeth Engine, European Version  (Read 9259 times)

Offline Don1966

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Re: Bruce Macbeth Engine, European Version
« Reply #75 on: June 03, 2019, 11:39:17 PM »
She is looking great Achim ........I..........like.........  :Love:



 :popcorn:
Don

Offline gbritnell

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Re: Bruce Macbeth Engine, European Version
« Reply #76 on: June 04, 2019, 11:21:25 AM »
Hi Achim,
The crankcase is coming along great! Those covers give it a very industrial look.
gbritnell
Talent unshared is talent wasted.

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #77 on: June 05, 2019, 08:40:41 PM »
John, Don and George, thank you very much for watching and taking the time to give positive comments.
Progress is slow currently, due to a nice summer starting and some necessary gardening.
Kind Regards
Achim

Offline scc

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Re: Bruce Macbeth Engine, European Version
« Reply #78 on: June 05, 2019, 08:56:35 PM »
Wonderful work Achim,  :praise2:   And congrats for mastering the "dark side"    My mind is incapable of taking me there....even if I wanted it to. :headscratch:    Terry

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #79 on: June 09, 2019, 06:53:17 AM »
Hi Terry, thanks for watching and never underestimate your mind, please.
It is mostly able to achieve more than you are ever able to think about.

Next part of the door hinge story is done.
These parts are really tiny in my eyes.
The pin hole is 1,5 mm and they are made from a 4 x 4 mm brass bar.
8 pieces are needed, so I have cut material for 10.
I have found an old fixture in the shelf, something I have used for the Snow build earlier, similar to what I know under the term "finger plate".
This thing was modified to do the job.

Here a short video of the simulation, followed by the real job with the CNC mill.




Kind Regards
Achim

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #80 on: June 14, 2019, 07:49:39 PM »
Some epoxy glue and the door hinges are in a fixed position.
« Last Edit: June 15, 2019, 04:20:44 AM by fumopuc »
Kind Regards
Achim

Offline Admiral_dk

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Re: Bruce Macbeth Engine, European Version
« Reply #81 on: June 14, 2019, 11:35:54 PM »
Nice result so far Achim  :ThumbsUp:

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #82 on: June 21, 2019, 10:22:11 AM »
Hi Per thanks.


Next step the crankshaft bearings.
First the end flanges from aluminum bar stock, a job for the lathe to get a nice slip fit in the crank housing and a concentric bore for the bronze bush.
My shaft diameter will be 12 mm so I have drilled the bushes first up to 11 mm and than a turning operation to 11,8 mm.
The rest was done by a 12H7 reamer.
Now we have had the first moment for a sample assembly with a dummy shaft.
To be honest I have been very nervous, because the first moment of truth was there and the question, will it turn freely ?
But there was a positive surprise......
Kind Regards
Achim

Offline yogi

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Re: Bruce Macbeth Engine, European Version
« Reply #83 on: June 21, 2019, 03:29:12 PM »
Beautiful work Achim!  :ThumbsUp: :ThumbsUp: :ThumbsUp:
It's coming together nicely!  :popcorn: :popcorn: :popcorn:

Offline Don1966

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Re: Bruce Macbeth Engine, European Version
« Reply #84 on: June 21, 2019, 04:43:19 PM »
Good results Achim bet you happier then a squirrel in a box of nuts!..... :ThumbsUp:



 :cheers:
Don



Offline Roger B

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Re: Bruce Macbeth Engine, European Version
« Reply #85 on: June 21, 2019, 05:22:25 PM »
You must be pleased with that alignment  :praise2:  :praise2:  :wine1:  Straighter than my camshafts  :(
Best regards

Roger

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #86 on: June 21, 2019, 07:02:30 PM »
You must be pleased with that alignment  :praise2: :praise2: :wine1:  Straighter than my camshafts  :(


Hi Roger thanks.
My camshaft will come later, so we will see what will happen to it.
By the way your camshaft, why are you doing this hardening story ?
Our engines are running with low revs, mostly no load on it, and we enjoy to see it idle with pencil springs at valves.
Is there a real need for a heat treatment ?
You are living in Switzerland now, the place were they produce the ETG 100 steel, very similar to 1141 Stressproof and easy to machine and no hardening necessary.
If you use this, for a camshaft it should last for an engine life.
So my two cent.


And Don, yes, I will jump back into the box with the nuts now.
« Last Edit: June 21, 2019, 07:48:25 PM by fumopuc »
Kind Regards
Achim

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #87 on: June 21, 2019, 07:49:25 PM »
Beautiful work Achim!  :ThumbsUp: :ThumbsUp: :ThumbsUp:
It's coming together nicely!  :popcorn: :popcorn: :popcorn:


Thanks Yogi.
Kind Regards
Achim

Offline Roger B

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Re: Bruce Macbeth Engine, European Version
« Reply #88 on: June 22, 2019, 11:38:24 AM »
Hi Achim,

My two cylinder engine is planned to work for it's living in a small tractor (as is the diesel when it eventually runs properly  ::) ) so I am expecting it to spend time at 3 - 4 000 rpm. The start of the concept is below.
Best regards

Roger

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #89 on: June 23, 2019, 07:46:56 AM »
Hi Achim,

My two cylinder engine is planned to work for it's living in a small tractor (as is the diesel when it eventually runs properly  ::) ) so I am expecting it to spend time at 3 - 4 000 rpm. The start of the concept is below.


Hi Roger,
by understanding your future purpose of these engines now, it makes more sense to go the old fashioned way.
On the other side, may be it is worth to try an experiment and see when the wear at a non heattreated ETG 100 cam shaft will start ?


Anyway, good luck for all your following R&D work with your very interesting projects.

Kind Regards
Achim