Re: bending 5mm Al plate

simonchettle
 

Ahh - Different days when chemicals and other compounds were freely available! I will say no more.

Simon

-----Original Message-----
From: Conrad, PA5Y
Sent: Monday, October 29, 2018 10:48 PM
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] bending 5mm Al plate

When I was kid we decided to make some roast potatoes on a dull grey metal beer crate, you must have seen them? Anyway it went up like a sparkler but much bigger! It was so vicious that we never dared try it again. What was that made of do you think? It was very lightweight. I have a vivid memory of it and the surprised look on my friends faces. I was probably around 8 years old or thereabouts because I was still living in Easington in the proppa North.

73

Conrad PA5Y

-----Original Message-----
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of John E. Beech
Sent: 29 October 2018 21:53
To: UKMicrowaves@groups.io; UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] bending 5mm Al plate

Yes, you need to be careful heating aluminium - it melts at 660 deg C - easily achievable with a blowtorch. Most Al alloys melt at slightly lower temps., except aluminium bronze ( which is mostly copper anyway) which melts above 1000 deg C. I once tried to bend some aluminium armour plate without annealing it - it just snapped!

de John G8SEQ

-------Original Message-------
From: Andy G4JNT <andy.g4jnt@...>
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMie 100crowaves] bending 5mm Al plate
Sent: Oct 29 '18 19:57

I remember from O-level metalwork days, to anneal aluminium fro
bending. Rub with soap and heat until the soap turns black
What we were never told is the actual temp that occurs at. But was
easy to achieve with a gas torch on the small bits we used

Andy
www.g4jnt.com

On Mon, 29 Oct 2018 at 19:48, Richard <richard@...> wrote:

> Hi
> the only thing microwavy about this is its the mounting bracket for
my > 13cms antenna.
>
> I need to make up a sturdy right angle bracket to mount the 13cms
antenna.
> I have a piece of Al plate 200mm x 80mm x6mm , I've been trying to
find > somewhere with a bending press ,without success, but the
other > thing > I'm not sure of is, will trying to bend this
thickness Al cold > cause it > to fracture, is this something that
needs to be done hot.
> Would I be better finding a blacksmith with a forge to get this >
bent to > shape ?
> --
> Best wishes /73
> Richard Bown
>
> Email : richard@...
>
> HTTP : http://www.g8jvm.com
>
>
>

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