Author Topic: Two things  (Read 603 times)

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royblackburn1@btinternet.

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Two things
« on: 28 November, 2020, 01:12:02 »
Hi all, two things I want to ask first when annealing a copper washer I believe it has to be cherry hot then what do you do let it cool or dunk it in oil to cool, second is what position should the needle be in on a amal concentric carb for a 1966 A65L some say second grove some say third thanks, Roy

Phil C

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Re: Two things
« Reply #1 on: 28 November, 2020, 10:16:44 »
I think you can let it cool or quench it in water, no need for oil.

Phil C

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Re: Two things
« Reply #2 on: 28 November, 2020, 10:20:38 »
Btw, when I worked in a workshop ( long ago) I think we would heat copper to dull red (not quite so hot as cherry red) before quenching in water.

DAVE BRADY

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Re: Two things
« Reply #3 on: 28 November, 2020, 10:29:40 »
Hi,

Manual in data section says needle pos.2.  In tuning section it says alter to get best running.  Start with pos.2 and see how it goes.  Worn needle and needle jet will cause a rich mixture so lower to pos.1.
New carb or needle and jet pos.2 should be fine.
Check plug colour or use a Colortune to see the colour of combustion with the engine running.

Dave.

Bess

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Re: Two things
« Reply #4 on: 28 November, 2020, 10:36:22 »
Hi Roy,

    Depends on which carb, Amal suggests 4th or third:

http://amalcarb.co.uk/carbspec/carburettor/spares/id/6582/

http://amalcarb.co.uk/carbspec/carburettor/spares/id/6586/


I always drop copper in water, it dislodges the oxidization. Using oil to quench, hardens steel without cracks or if you get the temp right it adds blue to slow corrosion.

Best wishes...
   
« Last Edit: 28 November, 2020, 10:47:42 by Bess »

B Murphy

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Re: Two things
« Reply #5 on: 28 November, 2020, 11:30:48 »
A trick that I was told by a blacksmith, rub the copper object in a bar of hand soap then heat the object up until the soap goes black and then put it under the cold tap.

royblackburn1@btinternet.

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Re: Two things
« Reply #6 on: 28 November, 2020, 18:43:23 »
Thanks for all replies got a lot of information, so will heat it to dull colour (with soap) and drop in water, the bike came with concentrics got some good info from Amal tech dept , Dave you jogged my memory I will find my colour tune out I run the bike with no air slides the cable holes on top  are sealed just tickle carbs to start should the air slides although not being used remain in the carbs. Roy

Phil C

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Re: Two things
« Reply #7 on: 28 November, 2020, 19:20:56 »
A dull (ie darkish) red is, I believe, the right colour.

To digress slightly, when I was taught to harden and temper steel, many years ago, what was called "cherry red" was not really what I would call  the colour of the average cherry. It was brighter than that. Closer to an orange than a cherry, I thought!  But then my colour vision is pretty terrible.


Calum

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Re: Two things
« Reply #8 on: 29 November, 2020, 12:49:19 »
A dull (ie darkish) red is, I believe, the right colour.

To digress slightly, when I was taught to harden and temper steel, many years ago, what was called "cherry red" was not really what I would call  the colour of the average cherry. It was brighter than that. Closer to an orange than a cherry, I thought!  But then my colour vision is pretty terrible.
I agree, when annealing copper especially I was told 'cherry red' then shown something which resembles bright orange! ;D

Anywhere between dull red and just before melting (!) will be fine for annealing copper, no need for soap, and quench in water. I only use the soap trick for annealing aluminium.

Group Leader

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Re: Two things
« Reply #9 on: 29 November, 2020, 18:37:19 »
I thought the soap trick was for annealing aluminium (that's certainly what I use it for and it works a treat!), "soap" blacking temp wouldn't have been high enough for annealing copper I would have thought. 

As others have said, cherry red (in subdued light).

Alan

royblackburn1@btinternet.

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Re: Two things
« Reply #10 on: 29 November, 2020, 19:12:02 »
Thanks everyone I now know, Roy

B Murphy

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Re: Two things
« Reply #11 on: 29 November, 2020, 23:52:56 »
The soap trick was from a blacksmith, saying that he only worked in blacksmithing for 40 years  ;).