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2013-03-19, 2:51pm
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Linda Linda Honey, lookit
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Join Date: Oct 31, 2008
Location: Almost paradise... ccept for the humidity.
Posts: 951
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Carbon!!! Hothead question,
I've got a HH and a 5g bulk tank.
Today I went to burn glass again and all of my clear ended up with whispy black lines, and turned yellow. Carbon.
What causes this and how can I avoid it? I was at the bottom of the tank apparently, as I filled it afterwards and the guy put in 4.6 gallons. Does carbon collect at the bottom?
I don't ever remember getting yellowed clears when working with the 2lb tanks.
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Christopher
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2013-03-19, 3:27pm
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The Harbinger of Cuteness
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Join Date: Dec 11, 2007
Location: Los Osos, San Luis Obispo County, California
Posts: 1,465
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Yes, the bottom of the tank can give you more carbon. I'm assuming you know to lower your flame as low as it will go without going out and to melt your glass as far from the torch as your patience will allow?
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Aimee Moisa
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#M-191
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2013-03-19, 3:37pm
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Slogan Challenged...
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Join Date: Mar 21, 2009
Location: Maricopa, Arizona
Posts: 6,287
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Patience, good point. Also visibility. I am on the same set-up, and my first bead of the day is almost always like that. I turn down the flame a little and I am good to go. You will find you have to turn it down more than you might think.
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Kristin ~
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Etsy:
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2013-03-19, 4:18pm
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The Harbinger of Cuteness
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Join Date: Dec 11, 2007
Location: Los Osos, San Luis Obispo County, California
Posts: 1,465
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When I spoke with the lady that makes (?) the hot heads she said to turn it down almost until it was going out, and then turn it up the tiniest of amounts.
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Aimee Moisa
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#M-191
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2013-03-19, 4:41pm
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Senior Member
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Join Date: Mar 07, 2011
Location: Northern California
Posts: 2,023
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Its a brazing torch repurposed for glass. It will tend to be reducing which causes carbon buildup and the flame chemistry is not easily adjustable.
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2013-03-19, 5:03pm
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Senior Member
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Join Date: May 27, 2008
Location: Albion NY
Posts: 517
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You might be getting a bit more of the oderant or other buildup in the line.
Mine does the same thing, starting very low and increasing the flame works most of the time others times I have to let it run for a bit.
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2013-03-19, 5:16pm
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
Posts: 5,200
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Most Hot Head users do not adjust flame properly..... Most user just open valve as far as they can till there is no increase in BIG BUSHY FLAME... This is wrong flame for glass, it is fuel rich therefor carbon rich....
Turn flame down till center of flame takes on distinct bright blue pencil point.... New HH torch are no as adjustable as older models (5 years of more old)...
By turning flame down as much as torch will let you means you can have just as much heat with a more complete combustion therefor cleaner flame and less sooty glass...
Also noise level will drop some....
Dale
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Vendor-Artist-Studio-Teacher Registry
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San Francisco - A Few Toys Short of a Happy Meal
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2013-03-19, 5:24pm
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The Harbinger of Cuteness
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Join Date: Dec 11, 2007
Location: Los Osos, San Luis Obispo County, California
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You still need a pair of noise-cancelling headphones though. Used my hot head at that smallest setting for several years and I think it did me some hearing damage. LOL
Quote:
Originally Posted by Dale M.
Most Hot Head users do not adjust flame properly..... Most user just open valve as far as they can till there is no increase in BIG BUSHY FLAME... This is wrong flame for glass, it is fuel rich therefor carbon rich....
Turn flame down till center of flame takes on distinct bright blue pencil point.... New HH torch are no as adjustable as older models (5 years of more old)...
By turning flame down as much as torch will let you means you can have just as much heat with a more complete combustion therefor cleaner flame and less sooty glass...
Also noise level will drop some....
Dale
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Aimee Moisa
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#M-191
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2013-03-19, 5:32pm
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Linda Linda Honey, lookit
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Join Date: Oct 31, 2008
Location: Almost paradise... ccept for the humidity.
Posts: 951
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Quote:
Originally Posted by Dale M.
Most Hot Head users do not adjust flame properly..... Most user just open valve as far as they can till there is no increase in BIG BUSHY FLAME... This is wrong flame for glass, it is fuel rich therefor carbon rich....
Turn flame down till center of flame takes on distinct bright blue pencil point.... New HH torch are no as adjustable as older models (5 years of more old)...
By turning flame down as much as torch will let you means you can have just as much heat with a more complete combustion therefor cleaner flame and less sooty glass...
Also noise level will drop some....
Dale
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I've had it's one for at least three years now and it's older than that since I bought it used.
And yup, I've been using it wide open!
I'll try turning it down.
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Christopher
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2013-03-19, 5:34pm
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Linda Linda Honey, lookit
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Join Date: Oct 31, 2008
Location: Almost paradise... ccept for the humidity.
Posts: 951
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Quote:
Originally Posted by Lyssa
You still need a pair of noise-cancelling headphones though. Used my hot head at that smallest setting for several years and I think it did me some hearing damage. LOL
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Yeah, I seriously disturb the zen in Kim's studio! LOL She's got this nice quiet torch that you can't even tell is on, and I'm working off the back end of an F16 fighter jet... Or so it sounds. LOL LOL LOL
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Christopher
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2013-03-19, 7:09pm
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Senior Moment
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Join Date: Jun 16, 2012
Location: New Yawk
Posts: 4,161
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Quote:
Originally Posted by Dale M.
Most Hot Head users do not adjust flame properly..... Most user just open valve as far as they can till there is no increase in BIG BUSHY FLAME... This is wrong flame for glass, it is fuel rich therefor carbon rich....
Turn flame down till center of flame takes on distinct bright blue pencil point.... New HH torch are no as adjustable as older models (5 years of more old)...
By turning flame down as much as torch will let you means you can have just as much heat with a more complete combustion therefor cleaner flame and less sooty glass...
Also noise level will drop some....
Dale
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Interesting. I've also heard the opposite; the flame should be up because it pulls much more O2 thru the vent holes and consequently the flame is less fuel rich. *although always a reducing flame.
Frankly, I find there is no one flame level when I use my HH. If I'm using a striking glass I need to crank that baby up (and melt the glass a tad higher in the flame than usual). If I'm using a glass that burns easy, a low flame is what I use. I tend to turn it up more when melting most clears, and turn it down when working on softer glass like white and ivory. Clearly, while it in no way has the adjustment levels of a dual torch, the HH flame can be modified to better suit certain needs. The next time (hopefully there won't be one but if there is) this happens Christopher, try modifying the flame and see if it helps.
Alli
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