Precision PVC saw

I could use a little help. I'm looking for some way to make fairly precise cuts in 6" PVC. ( Don't ask, it's complicated. But not pressurized or anything dangerous. ) I tried a side cutting bit in a drill, it worked but wobbled side to side too much to make decently straight cuts. I'm thinking something like a jigsaw, but much smaller, also right-angle style would be good. I've been checking out this site for awhile now so, FOR THE LOVE OF GOD, I don't want to make one out of an Altoid's box ! :) Any ideas ?

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gyromild9 years ago
I was looking into building something similar a while back. Made a few sketches, but only went halfway through in building one of the design before laziness caught on. I was planning to use either AC Fan or Blender motor that I have laying around. Btw, hope these help. (There are pros and cons to each design, hope everyone can pitch some improvement ideas).
sketch2.gifsketch1.gif
jtobako9 years ago
How about a rotary cutter? Basicaly a small router with a cutting bit, I believe that dremel has a fitting and bit that does the same thing. A flat base, maybe modified to fit the pipe (extra piece glued to the bottom?), would keep the bit perpendicular.
ComfortablyPlum (author)  jtobako9 years ago
Hmmm....maybe. How small is small ? Like I said, I wasn't satiisfied with the rotery bit I tried. The rotation of the blade made it tend to pull "uphill" away from the cutting edge. Maybe some kind of half round base to stabilize the tool ?.....Hmmmm again, we might be getting someplace here :)
The problem with the drill was that it didn't have a base to rest on the pipe. The roto-zip?/router/dremel attachment keep the cutting edge of the bit in the work and keep it at a right angle-as you are working on pipe, if you can't control the side-to-side motion, you may need to screw a short section of pipe onto the base. If you are careful, you could just add a few nuts to the edge of the flat plate to get close to the curve of the pipe.
inst pipe cutter.jpeg
ComfortablyPlum (author)  jtobako9 years ago
Thanks, I think I'll give that a try.
Pat Sowers9 years ago
I have heard something about running electricity through a metal cable at a high current so it gets very hot witch can be used to cut PVC. I will look into it to try and find you a link
This is the basic idea.

Link
ComfortablyPlum (author)  Pat Sowers9 years ago
Thanks for the input. I'll have to rig something up to see how much heat I'd need to do the trick. 6" Schedule 40 PVC is pretty thick ( and dense.) I still think I'm looking for some kind of toothed saw.
ComfortablyPlum (author) 9 years ago
I appreciate the feed back. Not so much luck with a dremel: hard to work on a slightly round surface, also can't make direction changes ( like cutting an L shape. )
Even with a jigsaw you need to plan complex cuts. They often can't be done in one pass... An 'L' shape, for instance, is two overlapping rectangles. Sharp corners need to be made with two separate cuts. Leave some material behind to shape with the other dremel attachments or a file, etc. Just my two cents...
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