Can someone explain how I can cut an 10 in. stovepipe with an 22% angle it
is for an vent pipe on an 4-12 roof .

sal

sal wrote:

Can someone explain how I can cut an 10 in. stovepipe with an 22% angle it
is for an vent pipe on an 4-12 roof .

The correct way is with a 24" abrasive saw and an appropriately angled block
to put between the pipe and the saw's fixed jaw.

Pipefitters working on heavier pipe in a shop would use a large bandsaw. In
the field they would carefully lay out the line and cut it with a torch.

If a large saw isn't available you can lay out the line and use a plasma
cutter freehand to make the cut. If the tube wall is thin you could cut
slightly proud of the line and then sand to the line.

Grant

On Sep 7, 4:57*pm, Grant Erwin wrote:
sal wrote:
Can someone explain how I can cut an 10 in. stovepipe *with an 22% angle it
is for an vent pipe on an *4-12 *roof .

The correct way is with a 24" abrasive saw and an appropriately angled block
to put between the pipe and the saw's fixed jaw.

Pipefitters working on heavier pipe in a shop would use a large bandsaw. In
the field they would carefully lay out the line and cut it with a torch.

If a large saw isn't available you can lay out the line and use a plasma
cutter freehand to make the cut. If the tube wall is thin you could cut
slightly proud of the line and then sand to the line.

Grant

Dremel tool or other rotary cut off tool with a fiber reinforced thin
wheel. $30 at Wally World

Cutting is the easy part. Having the line to cut is the hard part. In my
high school drafting class I learned how to layout a piece of paper with the
line on it. Cut out the paper and wrap around the pipe. trace line and
you're good to go.

I searched the web for instructions on this. its easy but a bit more than I
can explain. I cam across this layout software that will give you one free
sample:
http://www.ezpipe.com/samples.htm

Karl

Normally there is a moving joint section that is used for that.

Cutting is an option - if you get the angle correct. Remember you have
to crimp the top end to insert and it needs to be long enough.

I had a middle sized wood stove and a 16' single wall tube to the roof box.
The air conditioner / fan unit for central air input or return air was just
at the top of the wall behind the tube. We could heat the whole house
and then shut off the fan - once the house was warm.

Martin

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


Grant Erwin wrote:
sal wrote:

Can someone explain how I can cut an 10 in. stovepipe with an 22%
angle it is for an vent pipe on an 4-12 roof .

The correct way is with a 24" abrasive saw and an appropriately angled
block
to put between the pipe and the saw's fixed jaw.

Pipefitters working on heavier pipe in a shop would use a large bandsaw. In
the field they would carefully lay out the line and cut it with a torch.

If a large saw isn't available you can lay out the line and use a plasma
cutter freehand to make the cut. If the tube wall is thin you could cut
slightly proud of the line and then sand to the line.

Grant


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On Sep 8, 6:12 am, "sal" wrote:
Can someone explain how I can cut an 10 in. stovepipe with an 22% angle it
is for an vent pipe on an 4-12 roof .

sal

OK, step by step.

1.Get 2 long pieces of wood, join them at 90 degrees (nails are fine.)
2.With a protractor, mark off an included angle of 22 degrees on the
(imagined) vertical axis. (You are building a triangle)
3.Get another piece of wood, lay it across the created 22
degrees,check alignment where it cross the bottom bit of wood, should
be 68 degrees, (non of this is super critical)
4.Lay pipe along created top of triangle - hopefully you've made this
rough as so that the vertical bit goes past the pipe where it lines up
with the edge.
5.Bang some sort of support on the triangle, nearby tree trunk,
whatever, to stop horizontal movement of pipe on triangle..
6. With a marking pen, hold against pipe at the 22 degree angle point
you have created, rotate pipe, you now have cut line.
7 Use a 4 inch angle grinder to do the cut - if you want to get fancy,
and your angle grinder supports it via an arbor, use a thin cutoff
blade. Otherwise, hack/burn your way through with a standard angle
grinder cutting blade...

Now, hope you can follow all that - my written English aint too hot.
If you like, email me off list and I will send you a sketch.

Andrew VK3BFA.

On Sep 7, 2:12*pm, "sal" wrote:
Can someone explain how I can cut an 10 in. stovepipe *with an 22% angle it
is for an vent pipe on an *4-12 *roof .

sal

I've not seen that done. On anything I've done, it's the flashing
HOLE that's adjusted, the stove pipe just goes straight through the
roof vertically. And for sheetmetal vents like on driers and hot
water heaters there are elbows with movable segments to get the
desired angle by rotating one or more of them.

If it's just a stub for an attic vent, who cares if it's square or
angled? You're not going to see it anyway and angling the bottom will
make sticking some kind of cap and/or screen on there a lot more
complicated than it needs to be. Unless you live where there's no cold
weather and no bugs, you're going to need one or the other or both.


Stan

On Sun, 7 Sep 2008 15:12:15 -0500, "sal" wrote:

Can someone explain how I can cut an 10 in. stovepipe with an 22% angle it
is for an vent pipe on an 4-12 roof .

sal

For what it's worth: a 4-12 roof is 18.4 deg from horizontal, not 22.

Thanks for the help guys, got it all figured out. My mistake 5-12 roof. The
reason I am making my own vents is because dealers want 135.00$ +tax per
unit, I need 4 and can make them a hell of a lot cheaper.

Sal

"sal" wrote in message
...
Can someone explain how I can cut an 10 in. stovepipe with an 22% angle
it is for an vent pipe on an 4-12 roof .

sal

On Sep 7, 1:12*pm, "sal" wrote:
Can someone explain how I can cut an 10 in. stovepipe *with an 22% angle it
is for an vent pipe on an *4-12 *roof .

Nevermind how, I'm wondering..._why_would a vent pipe be cut on
a bias? It doesn't mate to the roof surface, it pops up through
it.