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Posted by bugbear on April 24, 2008, 8:21 am
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For culinary purposes, I wish to make
a heat diffuser for my gas hob.
For low heat simmering, gas is not ideal;
you need a head diffuser, or (very) thick
soled pan to work well.
My cunning plan is to make
a copper hotplate; a rather simple
piece of fabrication, comprising
a copper disc (slab!) around 6-8mm thick,
and around 7-8 inches diameter.
Can anyone advise on the feasibility
of this, and also indicate where I could
the material, and any guessed as to cost?
Of course this project is trivial
enough that a should a copper rod of
adequate diameter be available, a machine cut
slice of stock is the finished item...
BugBear
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Posted by dave sanderson on April 24, 2008, 8:49 am
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> For culinary purposes, I wish to make
> a heat diffuser for my gas hob.
>
> For low heat simmering, gas is not ideal;
> you need a head diffuser, or (very) thick
> soled pan to work well.
>
> My cunning plan is to make
> a copper hotplate; a rather simple
> piece of fabrication, comprising
> a copper disc (slab!) around 6-8mm thick,
> and around 7-8 inches diameter.
>
> Can anyone advise on the feasibility
> of this, and also indicate where I could
> the material, and any guessed as to cost?
>
> Of course this project is trivial
> enough that a should a copper rod of
> adequate diameter be available, a machine cut
> slice of stock is the finished item...
>
> =A0 =A0BugBear
for a quote you could ask www.metalsontheweb.co.uk
they list round bar upto 4" dia, but other stuff is available.
Id expect it to be spendy tho (~=A3100 as a guess)
Dave
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Posted by Dave Baker on April 24, 2008, 8:58 am
Please log in for more thread options
> For culinary purposes, I wish to make
> a heat diffuser for my gas hob.
>
> For low heat simmering, gas is not ideal;
> you need a head diffuser, or (very) thick
> soled pan to work well.
>
> My cunning plan is to make
> a copper hotplate; a rather simple
> piece of fabrication, comprising
> a copper disc (slab!) around 6-8mm thick,
> and around 7-8 inches diameter.
>
> Can anyone advise on the feasibility
> of this, and also indicate where I could
> the material, and any guessed as to cost?
>
> Of course this project is trivial
> enough that a should a copper rod of
> adequate diameter be available, a machine cut
> slice of stock is the finished item...
Well it's plate you're after not bar but anyway. Aluminium also has a very
high thermal conductivity and a slice cut out of a plate of that would be
much easier, and cheaper, to obtain. I doubt many people stock copper plate
6mm thick and fewer still would ever have a need for bar 7" in diameter. Any
firm that does laser cutting will have aluminium plate suitable for your
needs.
As an aside it's interesting that brass, despite being mainly copper, has a
relatively poor thermal conductivity. Not much higher than the zinc it's
alloyed with.
--
Dave Baker
Puma Race Engines
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Posted by bugbear on April 24, 2008, 10:33 am
Please log in for more thread options Dave Baker wrote:
>> Of course this project is trivial
>> enough that a should a copper rod of
>> adequate diameter be available, a machine cut
>> slice of stock is the finished item...
>
> Well it's plate you're after not bar but anyway.
Yes - I suspect that cutting a circle from plate
is far more likely - I was being slightly facetious
with my slice-of-an-enormous bar concept.
> Aluminium also has a very
> high thermal conductivity
Indeed, but substantially inferior
to that of copper.
http://www.frostytech.com/articleview.cfm?articleID=233
Auminium is my fall back option if my dream
of copper comes to naught.
BugBear
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Posted by bugbear on April 24, 2008, 10:41 am
Please log in for more thread options bugbear wrote:
> Dave Baker wrote:
>>> Of course this project is trivial
>>> enough that a should a copper rod of
>>> adequate diameter be available, a machine cut
>>> slice of stock is the finished item...
>>
>> Well it's plate you're after not bar but anyway.
>
> Yes - I suspect that cutting a circle from plate
> is far more likely - I was being slightly facetious
> with my slice-of-an-enormous bar concept.
>
> > Aluminium also has a very
>> high thermal conductivity
>
> Indeed, but substantially inferior
> to that of copper.
>
> http://www.frostytech.com/articleview.cfm?articleID=233
>
> Auminium is my fall back option if my dream
> of copper comes to naught.
Hmm. Given the cost of copper, and the laws
of physics, an Alu plate of twice the thickness
may be cheaper (and have the same heat conductivity)
as a copper plate.
It's the difference betweem heat conductivity
of an object and specific heat conductivity
of a substance.
BugBear (with options)
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> a heat diffuser for my gas hob.
>
> For low heat simmering, gas is not ideal;
> you need a head diffuser, or (very) thick
> soled pan to work well.
>
> My cunning plan is to make
> a copper hotplate; a rather simple
> piece of fabrication, comprising
> a copper disc (slab!) around 6-8mm thick,
> and around 7-8 inches diameter.
>
> Can anyone advise on the feasibility
> of this, and also indicate where I could
> the material, and any guessed as to cost?
>
> Of course this project is trivial
> enough that a should a copper rod of
> adequate diameter be available, a machine cut
> slice of stock is the finished item...
>
> =A0 =A0BugBear