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The Venturi effect is quite impressive. It blows more than you need when the damper is wide open. The only reason to use a blower would perhaps be a more accurate control of air flow, not additional power.

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Just now, Joël Mercier said:

The Venturi effect is quite impressive. It blows more than you need when the damper is wide open. The only reason to use a blower would perhaps be a more accurate control of air flow, not additional power.

Joel, always the voice of reason and sanity.  Thanks.

                     Warner

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Got a little more done after work today.  I borrowed a tap from work today and got the larger brass pipe tapped inside so the smaller one threaded into it.  I also tapped the brass cap for the mig tip to screw into.  That one isn't exactly straight....not sure how much that will affect anything....one of you experts can chime in.   I also tapped the black pipe T and cut a cover out of an electrical box cover, which had the added advantage of having the correct thread screw on it already - bonus.  I need to find a suitable spring for that, but that's no big deal.  here's a couple of pictures from tonight's work:

 

burner inside.jpg

Intake cover closed.jpg

Intake cover open.jpg

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Well, I got the burner done today.  Because I had to use so many bushings on the one side, I was concerned that the MIG tip wasn't far enough from the vent opening to work as well as it could, so I replaced the 4" brass pipe with a 6" brass pipe, which puts he MIG tip 2" further down the pipe, away from the vent.  I didn't test it with the 4" brass pipe, but I think it was the right move.  Here's how far it goes now with the 6" pipe"

 

burner with 6 inch pipe.jpg

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Looking good.

Open the damper a tiny bit and should look like a supersized pencil torch with a reasonably defined blue cone.

What size propane tank are you planning to use with the final setup?

(The barbecue tank will freeze over after about 30 min of forging.)

James

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50 minutes ago, James Spurgeon said:

Looking good.

Open the damper a tiny bit and should look like a supersized pencil torch with a reasonably defined blue cone.

What size propane tank are you planning to use with the final setup?

(The barbecue tank will freeze over after about 30 min of forging.)

James

Good call, James.   

And yeah....I was planning on using the propane tanks that I have, at least initially. 

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4 hours ago, James Spurgeon said:

Looking good.

Open the damper a tiny bit and should look like a supersized pencil torch with a reasonably defined blue cone.

What size propane tank are you planning to use with the final setup?

(The barbecue tank will freeze over after about 30 min of forging.)

James

 I used mine for over an hour and half without a hickup. The tank was cold but it was fully functional. I never attempted forge welding temperature yet though...

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