DIY Annealer - the journey begins...

[Alantoo]

I tryed it when I first had the posh mech but it was't very good ,I see the soap and its what I used to do when bending Ally motor or aircraft panels , just wondering the tempilaq 750 f that I am told I should use is way above the soap trick and will my case's be good to go at the lower temp as shown feller if so this is a saving of 30 odd pounds more on a cheap build for idle hands .

750Deg F = 399Deg C = soap going black = stress relief annealing 70/30 cartridge brass = full annealing temperature of Aluminium.

Alan

 

[paul o']

Cool thats what I needed to read , just hope the old girl dont miss here carbolic soap .lol

 

[Bavarianbrit]

The soap trick on alloy was taught to me as a way to shrink panels that have taken a a dent = stretched.

 

[Alantoo]

The soap trick on alloy was taught to me as a way to shrink panels that have taken a a dent = stretched.

All it does is tell you that you have reached Aluminium annealing temperature at around 400DegC so you don’t over heat it. When I am forging aluminium I use the “charred wood trick” which is just beyond the temperature of the “greasy stick trick” which gives you the tempering temperature of spring steel! Tricky stuff this metalworking!

Can you describe the heat shrinking panel straightening technique you were shown? Similar principles I use heat triangles to bend or straighten RSJs and channels. With panel dents depending on thickness I was shown to do a series of spot heats, or centre starting spirals, quenching in between. The idea being to upset (thicken) the metal by spot heating which makes it expand but the surrounding cold metal to holds the form forcing it to become thicker. On cooling and shrinking back the metal does not revert to the pre heat thickness so pulls the surrounding metal taut and thus straighter.

Alan

 

[Bavarianbrit]

It was way back in 1968 so I think what you described was the way. It was at Garretts Green Technical College, B,ham on a C&G vehicle body building course that I had to attend 2 days per week as part of my apprenticeship.

 

[paul o']

Right chaps i'v had the Dove out and doing a few tests pre melting good brass lol, Q is ? of the above what one would you run at ,they were held in a rotating chuck at around 20rpm 15mil from blue tip of inner flame .
Thanks
Paul

 

[Liveonce]

4 seconds me would say

 

[Alantoo]

Right chaps i'v had the Dove out and doing a few tests pre melting good brass lol, Q is ? View attachment 159159 of the above what one would you run at ,they were held in a rotating chuck at around 20rpm 15mil from blue tip of inner flame .
Thanks
Paul

Difficult to tell from here...did you wipe the soap all round the neck or just do a swipe?

I apply the soap when the case is spinning in the chuck to get some around both neck and shoulder and then as it starts to go straw colour adjust the position in the flame to try and bring both neck and shoulder soap to black at the same time.

The front end of the video in the link below shows the soap application and the back end the colour change I look for...

Alan

Annealing, First proper go.

Did these on Monday

www.thestalkingdirectory.co.uk

Mine end up like...

 

[paul o']

Just a line from the neck to head when I get the motors I will be able to set the timers up ,so I should cover all of the neck shoulder on the test brass , my seek thermal was showing a temp around 705 -815 once out of the flame .