Re: [CAD_CAM_EDM_DRO] Re: plasma vs laser vs browns gas for cnc router cutting

Robin Szemeti wrote:

>On Monday 12 January 2004 04:48, turbulatordude wrote:
>
>
>
>>>process when cutting thick metal. Its just metal burning in
>>>
>>>
>>Oxygen ... as it
>>
>>
>>
>>>always is ...
>>>
>>>
>>The flame is purported to be in the 6,000 degree range so it would
>>seem to be considderably higher than acetelene(sp?)
>>
>>
>
>acetylene isn't particularly hot. What 'sells' acetylene is its high energy
>.. it carries a LOT of heat (in terms of joules) rather than being at a very
>high temperature .. the 'browns gas' is just an oxy-hydrogen flame, its
>'hotter' but as I understand it, has a lower energy density.
>
>

Actually, Acetylene is pretty hot, 5400 - 5700 F, WAY hotter than most other
torch flames. Actually, Oxy-Methylene (Oxy-MAPP) flames are almost as
hot, but produce even MORE heat per gm of fuel/Oxygen than Oxy-Acetylene.
And, yes, the Oxy-Hydrogen flame is WAY short of these fuels in terms of
heat production.

>
>
>>and since it also
>>is reported to work on aluminum, the cutting is not just the metal
>>buring like in steel torch cutting.
>>
>>
>
>not convinced ....
>
>
>
>>The old Harbor Freight product, which I think may be discontinued,
>>listed the tip as only 1mm wide. That would put the 6,000 degess in
>>a 1 mm point. The the huge volume of gas, but actually a small
>>volume.
>>
>>
>
>I'll make a wild guess here ... if they are putting 25A at 240V into their
>'electrolizer' they will be getting at most 6Kw of energy out (I@ll guess the
>efficiency is around 75%, lets say 4Kw out) ... I'm putting about 25Kw into
>my plasma, 20Kw of which ends up at the business end. I'll take a guess and
>say that the plasma will cut quicker ...
>
>

Yup, no doubt about it. And, your plasma machine may develop temperatures
near 10,000 F, too!

Jon