Author Topic: Bruce Macbeth Engine, European Version  (Read 76290 times)

Offline Don1966

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Re: Bruce Macbeth Engine, European Version
« Reply #45 on: February 12, 2019, 09:02:33 PM »
Nice attempt Achim and Chris is right you need fast concentrated heat especially to get those missed spots to take.

 :cheers:
Don

Offline Dave Otto

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Re: Bruce Macbeth Engine, European Version
« Reply #46 on: February 13, 2019, 01:03:07 AM »
That came out pretty good Achim, I'm sure with just a little more work you will be able to get it finished up to your satisfaction.

Dave

Offline Rustkolector

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Re: Bruce Macbeth Engine, European Version
« Reply #47 on: February 13, 2019, 03:50:36 AM »
Achim,
From your photos the torches you are using look like they use a butane/propane fuel mix which is not hot enough. You need 100% propane fuel and a larger torch as Chris has mentioned. Because brass draws heat away quickly, silver brazing is still difficult on large items if you don't have supplemental heat. One alternative to the latter is to use a proper brazing hearth with adequate heat. It should be constructed of soft insulating firebrick which has a high surface emissivity (emits heat by radiation) and a temperature rating of 1100 C or higher. These bricks are placed under and around the item being brazed and will conserve and radiate much of the heat applied. DO NOT use hard firebrick. It absorbs too much heat. Insulating firebrick is soft and chalky and is easily shaped for all sorts of brazing projects. Another method is to elevate the item being brazed on a piece of heavy gauge loose weave SS wire cloth so heat can be applied from all sides as well as under the item. No matter what the brazing setup, you still need adequate heat to do the job fast enough that the flux is not exhausted.

While it is not always possible, try to apply heat from the side opposite the flux and brazing material. From your photos, I think you can reduce the quantity of your silver brazing wire significantly. When it flows, it can go a long way if the joints are as tight as they should be. The silver braze material will flow to any fluxed surface so keep the flux in and near the joint.

I'm following your build with interest.
Jeff

Offline MJM460

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Re: Bruce Macbeth Engine, European Version
« Reply #48 on: February 13, 2019, 10:30:11 AM »
Hi Achim, a pity about that little gas stove.  I have one just like it as far as it is still possible to tell, and it was quite expensive here.  But the good news is that you don’t have to feel guilty about taking parts from it to make your own gas fired burner for your next boiler.

It looks like a case of so near, yet so far on the soldering.  Ah well, if at first you don’t succeed, try, try again!

Looking forward to the next steps, it is a nice looking engine.

 MJM460

The more I learn, the more I find that I still have to learn!

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #49 on: February 17, 2019, 03:16:50 PM »
Hi everybody, thanks for watching and all the good advices.
In the meantime the job is done and everything is as I would like to have it seen first time already.
Last week, after a couple of days, I have got my second camping outdoor cooker for EUR 16,99 !
So I could attack with double basic heat, which was available already after 10 minutes now.
I have resoldered 5 places in less than 20 Minutes.
Also after some cleaning I could not find any issues.
Kind Regards
Achim

Offline Don1966

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Re: Bruce Macbeth Engine, European Version
« Reply #50 on: February 17, 2019, 04:20:27 PM »
Awesome Achim glad to hear!..,. :ThumbsUp:


 :cheers:
Don

Offline crueby

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Re: Bruce Macbeth Engine, European Version
« Reply #51 on: February 17, 2019, 05:06:27 PM »
Excellent! Always goes much better with proper heat.
 :popcorn: :popcorn: :popcorn:

Offline steamer

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Re: Bruce Macbeth Engine, European Version
« Reply #52 on: February 17, 2019, 05:17:30 PM »
Good to see Achim!   I always get so stressed out with big SS solder jobs....when your pushing the setup, you never know for sure what's going to happen....

Glad it got done!!!   :praise2: :cartwheel:

Dave
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Damned ijjit!

Offline Roger B

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Re: Bruce Macbeth Engine, European Version
« Reply #53 on: February 17, 2019, 05:18:49 PM »
Excellent  :praise2:  :praise2:  :wine1:
Best regards

Roger

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #54 on: February 17, 2019, 07:59:16 PM »
Don, Chris, Dave and Roger, thanks.


In the meantime the little discounter toaster oven had to work very hard.
I took him nearly two hours to get the crank case to over 200° C for the melting of my soft solder paste.
But finally also this job seems to be done.
The door frames are in place now.
Kind Regards
Achim

Offline Dave Otto

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Re: Bruce Macbeth Engine, European Version
« Reply #55 on: February 17, 2019, 10:32:39 PM »
Looks great Achim!

Dave

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #56 on: February 24, 2019, 08:47:43 AM »
Hi Dave, thanks.


In the meantime the assembly machining is ongoing.
First set up was made to the reference of the 3 crankcase webs at the bottom.
These should be in good relationship to the temporary clamped bar in the later crank shaft bearing places, crankshaft center.
An adjustment of 0,2 mm in Z has given a good surface at the top of the crankcase.
It was flipped around and I have machined the lower surface to the necessary hight, in relationship to the crankshaft center.
Than flipping it around another time and doing the same with the crankcase top.
Next to do was, the whole story moved to the lathe and machining the side plates to its final dimension, referring to the middle web at the black cross marked point.
Kind Regards
Achim

Offline Admiral_dk

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Re: Bruce Macbeth Engine, European Version
« Reply #57 on: February 24, 2019, 08:52:42 PM »
Looks like your build-up crankcase cleans up nicely Achim - must be a relieve to confirm this :cheers:

Offline Dave Otto

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Re: Bruce Macbeth Engine, European Version
« Reply #58 on: February 24, 2019, 11:15:49 PM »
Crankcase is looking great Achim.
Nice to see the clean up cuts coming out so well!

Dave

Offline Art K

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Re: Bruce Macbeth Engine, European Version
« Reply #59 on: February 24, 2019, 11:37:04 PM »
Achim,
I just got caught up. Great job doing the silver solder, it does seem like a big job. Great work!
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King

 

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