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Post by Garry Coles on Nov 18, 2008 20:44:44 GMT
 Hi A question about normalising two bits of BMS 1/4" X 1" X 7" long. The construction manual for building Martin Evans "William" states that the bits of steel being used to make the connecting rods should be normalisied by heating up to bright red and then letting them cool down as slowly as possible. But on reading Tubal Cain's book on heat treatments, he states that it should be held at this temp for one hour per inch of section, does this mean it will be one hour because it's 1" wide or for 15 minutes because it's only a 1/4" thick. Does anyone have any ideas on this. Thanks Garry in not so sunny Jersey.
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Doug
Active Member
Posts: 13 
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Post by Doug on Nov 18, 2008 21:38:01 GMT
Garry,
15 minutes will be plenty. In a piece that size, once the whole part is red will be enough. Bury the pieces in lime or ash. If you were doing it in a heat treat furnace, you could just turn the furnace off and let the part cool down as the furnace does.
Regards,
Doug E.
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Post by Shawki Shlemon on Nov 19, 2008 8:56:20 GMT
I do it for all the rods , I use fire bricks , I form sort of a box from the bricks and place the metal in , heat it to red hot keep the heat for a while ( not very long ) then cover it with more bricks and heat them , then let them cool at room temperature . It works fine , it is not perfect but satisfactory , the metal does not distort during machining.
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Post by Tel on Nov 19, 2008 9:11:24 GMT
Bein' a dumb ol' country boy, I got an open fire, and a wood stove in the kitchen - stick 'em in one or t'other at night and fish 'em out in the morning
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Post by circlip on Nov 19, 2008 9:30:26 GMT
That was the recommended way over here Tel, but then we got soft and fitted central heating.
Regards Ian.
PS. Garry, don't forget the magnetic rule, if it no longer is magnetic when it's red hot, it's reached a state of annulment.
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Post by durhambuilder on Nov 19, 2008 12:30:53 GMT
Bein' a dumb ol' country boy, I got an open fire, and a wood stove in the kitchen - stick 'em in one or t'other at night and fish 'em out in the morning
Or about 30 seconds in the woodburner to get copper plates red hot for flanging into boiler plates, that's how I did mine.
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Post by davidmew on Nov 27, 2008 16:46:54 GMT
Hi there
If I heat the wife to red hot, will she be anulled?
regards David
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Post by Tel on Nov 27, 2008 18:45:59 GMT
Probably not - I'd keep me 'ead down til she cooled off a bit tho'.
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Post by weldsol on Nov 28, 2008 7:58:03 GMT
Probably not - I'd keep me 'ead down til she cooled off a bit tho'. And watch out in case she work hardens Paul |
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Post by spurley on Nov 29, 2008 10:01:14 GMT
That's happened to my Mother in Law!!!!!!!!!!
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Hi 
