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Slicing a pipe lengthwise
Posted by: clyde
Date: March 18, 2018 02:59PM
Given: A pvc pipe, 2-1/2 inch diameter, 10 feet long
Goal: Two half-cylindrical pieces 10 feet long

Would a skil saw, a table saw, or some other means be most suitable?
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Re: Slicing a pipe lengthwise
Posted by: N-OS X-tasy!
Date: March 18, 2018 03:01PM
Water drill?



It is what it is.
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Re: Slicing a pipe lengthwise
Posted by: Speedy
Date: March 18, 2018 03:11PM
Vertical bandsaw. If it's a one-off, any machine shop will make the cut.



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Edited 1 time(s). Last edit at 03/18/2018 03:13PM by Speedy.
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Re: Slicing a pipe lengthwise
Posted by: Carm
Date: March 18, 2018 03:14PM
Second band saw idea.
You could use a table saw with a jig.



Edited 1 time(s). Last edit at 03/18/2018 03:18PM by Carm.
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Re: Slicing a pipe lengthwise
Posted by: space-time
Date: March 18, 2018 03:16PM
Of course a Laser is the right tool.
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Re: Slicing a pipe lengthwise
Posted by: billb
Date: March 18, 2018 03:35PM
A table saw with a jig to keep it in position and straight would work easily enough.
A bandsaw with a jig to keep it in position and straight would work easily enough.
You could use a handsaw but kudos to you if you can keep it nice and straight.



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Re: Slicing a pipe lengthwise
Posted by: Carm
Date: March 18, 2018 03:50PM
You could even use a router and a jig.
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Re: Slicing a pipe lengthwise
Posted by: RAMd®d
Date: March 18, 2018 05:04PM
Of course a Laser is the right tool.

Of course it is. Speaking of cutting pipe...




Feeding 10' of PVC through a saw blade is a bit of a risky proposition so a jig of some nature is a must, for safety as well as accuracy. I think a jigsaw would have the narrowest kerf if that's any consideration.

But lasers are freakin' cool! Especially if you have a shark handy.




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Re: Slicing a pipe lengthwise
Posted by: clyde
Date: March 18, 2018 05:16PM
The table saw is the easiest option because I have one. Perhaps I can clamp a "handle" to the pipe to preserve angular orientation as the pipe is slowly fed along the table…
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Re: Slicing a pipe lengthwise
Posted by: Filliam H. Muffman
Date: March 18, 2018 05:39PM
Some sort of V-block clamped on the feed side of the table saw, draw a line down the pipe.

A table saw blade will take a fairly big chunk out so that they aren't quite half cylinders any more. I guess it depends on what you are going to use them for.



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Re: Slicing a pipe lengthwise
Posted by: nwyaker
Date: March 18, 2018 06:20PM
Quote
Filliam H. Muffman
Some sort of V-block clamped on the feed side of the table saw, draw a line down the pipe.

Used this method for making some ABS gutters - worked fine.
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Re: Slicing a pipe lengthwise
Posted by: clyde
Date: March 18, 2018 06:44PM
Quote
nwyaker
Used this method for making some ABS gutters - worked fine.[/quote]

What size pipe did you use?
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Re: Slicing a pipe lengthwise
Posted by: nwyaker
Date: March 18, 2018 07:37PM
Two inch diameter. They were for a mini gutter on a pergola with overhead tempered glass. ABS because it has better UV resistance than PVC.
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Re: Slicing a pipe lengthwise
Posted by: tenders
Date: March 18, 2018 09:10PM
Quote
Filliam H. Muffman
A table saw blade will take a fairly big chunk out so that they aren't quite half cylinders any more.

The word you seek is "kerf." A kerf is inevitable, and sometimes desirable; it is a matter of degree. I suspect anyone with a table saw is already aware of the effect!

I think you could do this pretty easily with the usual table saw fence and perhaps an extra set of hands to support the long pipe and keep it from twisting (much).

To lead the witness a bit...maybe you'd set the fence to half a kerf's width less than half the pipe diameter, so the two cut pieces are symmetric?
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Re: Slicing a pipe lengthwise
Posted by: Rick-o
Date: March 18, 2018 10:09PM
Quote
tenders
Quote
Filliam H. Muffman
A table saw blade will take a fairly big chunk out so that they aren't quite half cylinders any more.

The word you seek is "kerf." A kerf is inevitable, and sometimes desirable; it is a matter of degree. I suspect anyone with a table saw is already aware of the effect!

I think you could do this pretty easily with the usual table saw fence and perhaps an extra set of hands to support the long pipe and keep it from twisting (much).

To lead the witness a bit...maybe you'd set the fence to half a kerf's width less than half the pipe diameter, so the two cut pieces are symmetric?

Heh! Reminds me before I retired, an engineer came down to the shop with a nice drawing of a piece of plywood with measurements for various lengths and widths, using the entire 4'x8' sheet. He didn't allow for the kerf. When we tried to explain this, he acted like we were from Mars or something. RollingEyesSmiley5



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Re: Slicing a pipe lengthwise
Posted by: mrbigstuff
Date: March 18, 2018 11:33PM
I think that is deep enough to use a jig saw, maybe cut a small amount of the blade. Naturally, use a blade meant to cut plastic.
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Re: Slicing a pipe lengthwise
Posted by: artie67
Date: March 19, 2018 12:53AM
Clyde,
Table saw and a 10' piece of plywood 2 1/2" high. Lay them both on a work table and tape together. Blue or masking will do fine. Measure a center line on the pipe and move the saw fence to match. You will need a helper to aid you. They will need something to keep the pipe pieces spread. A pencil or scrap of wood will work. If the saw has a spreader on the outfeed you will not necessarily need to do this. Most important at the end kill the saw asap. Don't attempt to push it through.
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Re: Slicing a pipe lengthwise
Posted by: Michael
Date: March 19, 2018 05:22AM
I'd use a table saw. I'd also have the blade just high enough to go through the thickness of the pipe and plan on running it through twice--rotating it 180 degrees after sending it through the first time. Given the unwieldiness of the whole thing, I'd think having a blade very low to the table would be safest.
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Re: Slicing a pipe lengthwise
Posted by: NewtonMP2100
Date: March 19, 2018 07:03AM
....bobbit......???



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Re: Slicing a pipe lengthwise
Posted by: MrNoBody
Date: March 19, 2018 07:03AM
Laser?? Yeah, if you don't care about the resultant dioxin vapors given off. nono smiley

Cost prohibitive, but a water jet will give the best result.

Table saw: 73 sec. how to on YouTube and they're dozens of other similar vids too.



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Re: Slicing a pipe lengthwise
Posted by: MikeF
Date: March 19, 2018 10:55AM
Or low tech -- just use a hand saw and follow the line...
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Re: Slicing a pipe lengthwise
Posted by: RAMd®d
Date: March 19, 2018 01:34PM
I only mentioned the kerf because there was no context.

Given that this is apparently about rain gutters (?) kerf isn't a consideration (unless clyde is a 'care about the back of the fence' kind of guy.

He's already got a table saw. But my preference with common tools would be a band saw with a couple of magnetic v-blocks to guide it.

I'd use small a sabre-saw (not a larger reciprocating saw) before I'd use a hand-saw. Although hacksaw would have it's own spreader and a finer kerf than most of the other sawing options.




When a good man is hurt,
all who would be called good
must suffer with him.

You and I have memories longer than the road that stretches out ahead.

There is no safety for honest men
except by believing all possible evil
of evil men.

We don’t do focus groups. They just ensure that you don’t offend anyone, and produce bland inoffensive products. —Sir Jonathan Ive

-An armed society is a polite society.
And hope is a lousy defense.

You make me pull, I'll put you down.

Mister, that's a ten-gallon hat on a twenty-gallon head.

I *love* Sigs. It's Glocks I hate.
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Re: Slicing a pipe lengthwise
Posted by: clyde
Date: March 19, 2018 02:28PM
Quote
RAMd®d
I'd use small a sabre-saw (not a larger reciprocating saw) before I'd use a hand-saw. Although hacksaw would have it's own spreader and a finer kerf than most of the other sawing options.

In my experience it would be practically impossible to make a straight cut—especially for 10 feet—with a hand hacksaw…


Thanks for all the good ideas!



Edited 1 time(s). Last edit at 03/19/2018 02:29PM by clyde.
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Re: Slicing a pipe lengthwise
Posted by: davester
Date: March 19, 2018 04:01PM
Quote
clyde
Quote
RAMd®d
I'd use small a sabre-saw (not a larger reciprocating saw) before I'd use a hand-saw. Although hacksaw would have it's own spreader and a finer kerf than most of the other sawing options.

In my experience it would be practically impossible to make a straight cut—especially for 10 feet—with a hand hacksaw…

...or a sabre saw. Table saw or band saw is definitely the way to go.



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Re: Slicing a pipe lengthwise
Posted by: RAMd®d
Date: March 19, 2018 04:56PM
In my experience it would be practically impossible to make a straight cut—especially for 10 feet—with a hand hacksaw…

Fast, easy, straight, narrow kerf... Pic any two! LOL


Table saw or band saw is definitely the way to go.

I agree.

Using a saber saw would be far more preferable than trying this with a hand saw, either would be a desperate act of use whatever you have. With the flat plate of the former, you could easily cobble together a three or four sided guide to travel the length of the PVC or feed it through, effectively making the saber saw into a jig saw. Cut on the dotted lines.

But yeah, he has a table saw.




When a good man is hurt,
all who would be called good
must suffer with him.

You and I have memories longer than the road that stretches out ahead.

There is no safety for honest men
except by believing all possible evil
of evil men.

We don’t do focus groups. They just ensure that you don’t offend anyone, and produce bland inoffensive products. —Sir Jonathan Ive

-An armed society is a polite society.
And hope is a lousy defense.

You make me pull, I'll put you down.

Mister, that's a ten-gallon hat on a twenty-gallon head.

I *love* Sigs. It's Glocks I hate.
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Re: Slicing a pipe lengthwise
Posted by: Steve G.
Date: March 19, 2018 06:00PM
"kerf"- great word. Thanks!
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Re: Slicing a pipe lengthwise
Posted by: Speedy
Date: March 19, 2018 07:54PM
Mods, could we make this thread a sticky?



Saint Cloud, Minnesota, where the weather is wonderful even when it isn't.
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Re: Slicing a pipe lengthwise
Posted by: space-time
Date: March 19, 2018 09:10PM
Quote
Speedy
Mods, could we make this thread a sticky?

no, since this is about cutting it in half.
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Re: Slicing a pipe lengthwise
Posted by: Speedy
Date: March 19, 2018 10:54PM
Quote
space-time
Quote
Speedy
Mods, could we make this thread a sticky?

no, since this is about cutting it in half.

Well, until this 10 foot piece of pipe gets cut, this thread is incomplete.



Saint Cloud, Minnesota, where the weather is wonderful even when it isn't.



Edited 1 time(s). Last edit at 03/19/2018 10:54PM by Speedy.
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Re: Slicing a pipe lengthwise
Posted by: NewtonMP2100
Date: March 22, 2018 01:53PM
.....stuff this in your pipe.....and smoke it......???



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