here is a quote i took on cutting a straight line on a 4" pvc tube. i did a fiberglass project and used pvc tubes and used a hack saw to make my ports. it is very very simple and just needs some patience. as for what blade i don't even know as i just borrowed a hack saw from someone.
Originally Posted by fbi90909
well cut the ports down. first. since the enclosure is just around 5.5cu i was measured out using 2 4" ports that each port would be 10.76" straight length, or 11.76" for flared length. soooo since i have a partial flare i decided to size up my ports to 11.25". so tuning should be in the 30hz range. or at least very close?
well we all know cutting PVC with a hack-saw won't get you a straight cut. well i did. first i took a flap off a cardboard box and wrapped it around the PVC tube, then marked 11.25" on various locations and then used my cardboard ring to trace an aligned ring around the tube. then i took my hack-saw and slightly cut into the PVC all the way around to get my cutting track.
then i began cutting, though i just didn't cut straight down even with the track. i cut a little bit and rolled the tube, cut a bit more, rolled the tube, and so on. i then used my sanding blocks flat side and sanded down the surface to get a flat straight surface. here's the cuts a glass table.
tomorrow i 'll begin sanding the inside of the tubes some so i can prep them for paint.
That saw in the pic is technically more often used as a coping saw to cope the corners of base molding so it goes together seamlessly. They make a bigger hacksaw that would make short use of it. If you don't want to do that, and you have the 40 bucks to spend, you can get a cheap jigsaw that will cut it quick.
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you can just use the ole standard hacksaw but I have used a table saw with a miter gauge and then either file/sand or run it on a router table with roundover bit to clean it up...
I Design Custom Enclosures
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It has been remarked that if one selects his own components, builds his own enclosure, and is convinced he has made a wise choice of design, then his own loudspeaker sounds better to him than does anyone else's loudspeaker. In this case, the frequency response of the loudspeaker seems to play only a minor part in forming a person's opinion.
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