[AT] More on torches

Henry Miller hank at millerfarm.com
Thu Mar 10 19:15:00 PST 2016


The oxygen isn't to blow the metal out it is to burn it away. Once the cut is started you can turn the fuel off and just use the burning iron to provide heat to continue the cut. 

On March 10, 2016 5:58:26 PM CST, Bill Brueck <b2 at chooka.net> wrote:
>I've always wondered why there isn't a cutting torch available that
>uses 3
>gasses: fuel (acetylene, LP) and oxygen for the heat part, and common
>air
>from the compressor to blow the metal from the cut.  Maybe that's
>available?
>Probably that's a dumb idea because...?
>
>>Bill Brueck
>Pine Island, MN, USA
>
>-----Original Message-----
>From: at-bounces at lists.antique-tractor.com
>[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Greg Hass
>Sent: Thursday, March 10, 2016 2:49 PM
>To: at at lists.antique-tractor.com
>Subject: [AT] More on torches
>
>A while ago we were talking torches plus LP vs. acetylene. I was having
>coffee today at the local coffee shop and one of those there owns a
>welding
>shop. The subject of LP vs acetylene came up. He said that the ratio of
>acetylene to oxygen when cutting is about 1 to 1. When using LP he said
>the
>ratio is roughly 7 parts oxygen to one part LP so he said its way to
>costly
>to cut with LP. One exception he noted was his flame table. He  might
>put a
>sheet of one inch plate steel on it and it will follow a pattern and
>cut
>exact sprockets for use by our local sugar beet company. Right now he
>said
>90% of his work is for them. Anyway, he said LP works better on the
>flame
>table because as it cuts the very outside edge of the sprockets are
>hardened. When I asked him why he said he doesn't really know, but that
>is
>the way it is. He said he has about two dozen tanks around the place
>and on
>his trucks. Also he said that on the job LP takes a lot longer to heat
>before cutting where as with acetylene you can start cutting in a few
>seconds.
>        Greg Hass
>
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