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Post by photoman290 on Oct 23, 2014 15:28:21 GMT -8
i am trying to find something to make a p channel for a batch box. i only have hand tools and and a few power tools. i would like to use off the shelf tubing if i can. could i use say 50mm x 25 mm for the part over the top of the burn tunnel and bend it to the right width at the bend where it goes over the port? i think i could manage that with the tools i have. trying to avoid welding as i have to pay someone to do that.
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on Oct 24, 2014 0:01:31 GMT -8
You can make the vertical channel using just a hacksaw or angle grinder. Here is a rough Sketchup drawing of what I mean. It isn't to scale. The lip on the right stops it dropping down. The horizontal channel can be made from fire brick. EDIT: Modified photo to show direction of fire
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Post by peterberg on Oct 24, 2014 0:28:08 GMT -8
The kind I've used in the 6" batch box happened to be 60x20x2 mm. Hanging 16 mm, the same as the inside measurement lower than the port and just the side which is against the back wall cut out 16 mm. So sorry Morti, your sketch isn't entirely correct in this respect. But the thing could be made like this, it will even work without the horizontal duct running over the top of the firebox. My first channel arrangements were like this and no, there won't be creeping smoke out of that opening despite it is inside the firebox and right above the port.
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Post by photoman290 on Oct 24, 2014 5:27:46 GMT -8
is the part that drops down at the bottom on the front, looking into the stove from the front, or the back pointing towards the riser.?
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Post by pinhead on Oct 24, 2014 6:47:46 GMT -8
is the part that drops down at the bottom on the front, looking into the stove from the front, or the back pointing towards the riser.? Look closely at the picture in the Batch Box Dimensions thread.
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on Oct 24, 2014 7:28:05 GMT -8
The part that drops down at the bottom is on the front, looking into the stove from the front. I have modified picture to show direction of fire.
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Post by peterberg on Oct 24, 2014 10:49:28 GMT -8
When the vertical p-channel duct is in the firebox in its entirety, only the side facing the riser should be cut out, the smaller sides should still be there. Is your channel built flush with the back wall of the firebox like the drawing Pinhead is referring to, by any chance? That would explain the contradiction.
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Post by photoman290 on Oct 24, 2014 15:52:09 GMT -8
i think i see what you mean now. if the channel is coming down IN FRONT of the back wall the sides should stay on and only the back is cut out if it is an extension of the port, it is as in pinheads drawing.
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