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Need ideas cutting PVC ductwork

Old 07-12-2012, 06:52 AM
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Default Need ideas cutting PVC ductwork

So - I have a work project for my maint tech. He needs to cut 10" PVC duct work for a warehouse storage project. This is sched 40 PVC, 10" and 70' (yes feet) long. The product is Harrison Super Duct. Any ideas how to cut and maintain a pretty smooth, straight, edge? Table saw, mitre saw, bandsaw etc.. out of the question due to the length of the pipe. My boss says chainsaw, I say sawzall with a jig. Problem is I don't know if I can get a sawzall blade long enough to make 1 cut without rolling the pipe.

Ideas??

Update - added a photo of my sample piece.
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Last edited by stevek185; 07-12-2012 at 07:19 AM.
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Old 07-12-2012, 06:54 AM
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Ask Mr Demeanor.
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Old 07-12-2012, 07:00 AM
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Where are Are you cutting? - across the diameter or along the length or an access hole or what? I am thinking if its one cut across the diameter a carpenters hand saw would get you most of the way there - Don't know how thick the wall of a 10" sch 40 pipe is but i have done this with 4 inch pipe. But from your post Iam sure its more complicated than that - good luck...
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Old 07-12-2012, 07:11 AM
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Originally Posted by LI Sound Grunt View Post
Where are Are you cutting? - across the diameter or along the length or an access hole or what? I am thinking if its one cut across the diameter a carpenters hand saw would get you most of the way there - Don't know how thick the wall of a 10" sch 40 pipe is but i have done this with 4 inch pipe. But from your post Iam sure its more complicated than that - good luck...
Across the diameter. We just need to cut it in 24" sections. Using it to store slim kegs on a warehouse rack.
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Old 07-12-2012, 07:18 AM
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Have you already taken delivery, or can the supplier cut to length for you? Unless you need every foot, I would start by cutting into more manageable lengths.
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Old 07-12-2012, 07:20 AM
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Originally Posted by glacierbaze View Post
Have you already taken delivery, or can the supplier cut to length for you?
Already taken delivery. Purchased prior to me starting my job here. I just want the project completed...
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Old 07-12-2012, 07:38 AM
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Typically, a reciprocating blade goes up to 12" for 8" cuts. I looked up Lenox blades and I didn't see longer than 12" (it may be there somewhere). I have seen longer, just don't know the Mfg. A jig would be simple to make.

If you have enough hands and a miter saw, you could just roll it while cutting. If accuracy and clean cut doesn't matter much, a chain saw would do fine.
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Old 07-12-2012, 07:38 AM
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Originally Posted by stevek185 View Post
Across the diameter. We just need to cut it in 24" sections. Using it to store slim kegs on a warehouse rack.
Sure hand saw and circular saws will all work - (smoother ends than a chain saw will leave) BUT Wow...
Man getting it that clean and smooth is gonna be tough....

Maybe a few cuts into smaller pieces with the above and then finish the smaller pieces with a fine blade band saw.??? My buddy has a 10 or 12 inch on eof these....

http://www.harborfreight.com/garage-...saw-96980.html

Then sandpaper or sanding if necessary.
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Old 07-12-2012, 07:56 AM
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Metal cutting bandsaw
Somewhere near by is a shop that can cut it for you, if you just rough cut into 8-10 foot lengths, and put it into the back of a pick up.
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Old 07-12-2012, 08:29 AM
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I am on the industrial side so this might not be valid in your world.

Any good pipefitter could walk a Portaband around that piece and keep tolerances within 1/16".
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Old 07-12-2012, 09:59 AM
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Originally Posted by glacierbaze View Post
Metal cutting bandsaw
Somewhere near by is a shop that can cut it for you, if you just rough cut into 8-10 foot lengths, and put it into the back of a pick up.
This is the way I would go. Only issue is the pipe may want to roll while cutting it.
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Old 07-12-2012, 10:01 AM
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I used to cut it with a 1 foot blade saw sall for metal
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Old 07-12-2012, 10:10 AM
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I cut 10 in fiberglass exhaust tube with a jig saw. I put a hose clamp around the pipe where I want to cut and mark it and then cut it.
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Old 07-12-2012, 10:26 AM
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This is all your need, nothing more perfectly round cut, not to hard to do. I know tons of plumbers that use this method every day for stuff like this.



Just twine around the pipe wear some gloves and pull it back and fourth. When it heats up after a few pulls goes through the stuff like butter.

Good luck
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Old 07-12-2012, 10:29 AM
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here is a link to video so you know I aint completely crazy


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Old 07-12-2012, 11:16 AM
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I would not have guessed that worked so well. I wonder if you could incorporate a cordless drill into the string technique...
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Old 07-12-2012, 11:16 AM
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You guys never cut RCP pipe???

Just wrap the pipe with paper and keep the edges inline and draw a line with a marker. While a demo saw is OK I'd use a circular saw myself with a plastic blade.
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Old 07-12-2012, 11:31 AM
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Originally Posted by The_China_Doll View Post
This is all your need, nothing more perfectly round cut, not to hard to do. I know tons of plumbers that use this method every day for stuff like this.



Just twine around the pipe wear some gloves and pull it back and fourth. When it heats up after a few pulls goes through the stuff like butter.

Good luck
ill be damned!!! I have officially learned something impressive today!!
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Old 07-12-2012, 11:45 AM
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is there something special about that type of twine or will any type do?
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Old 07-12-2012, 11:52 AM
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Originally Posted by The_China_Doll View Post
here is a link to video so you know I aint completely crazy


http://www.youtube.com/watch?v=I0GvqLFC32o
amazing - he used Nylon string I noted....

Thanks!!!!!! I learned a biggie here!
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