Cutting sheet PVC..

[spudkpi]

I recently made some sheet Pvc from 3'' pipe in the oven. I flatened it out and I plant on using it for my 3'' piston and i need to be able to cut disks from the PVC sheet and i cannot think of a good method to cut perfect circular 3'' disks... please help?

[noname]

You could use a keyhole saw, but their like 15 bucks for a 3" one.

[BC Pneumatics]

There are cheap hole saws, you may want to run it in reverse and flow some water over the sheet if you use this method though.

I say scribe the circle on there, then use ascroll saw, or, keeps scribing deeper and deeper until you get thru it.

[spudkpi]

How do i scribe it?

[SpudStuff]

with a sharp tool like a chizel or pick

[BC Pneumatics]

I would use an awl, or a wood scribe.

[schmanman]

a hole saw and a slow speed drillpress

[Shrimphead]

You could just draw the circle on it, then cut as close to the circle shape as you can with whatever tools you have. Then sand it down on a belt sander.

[rna_duelers]

Get some sheet metal and make a 3" circle and use a propane torch to heat it up and cut a hole through it.

[Pete Zaria]

Assuming you don't have any expensive tools avalible such as drill presses...

Use a compas (the kind used for drawing, not a magnetic one) to draw a perfect 3" circle on the PVC sheet. Actually, make the circle 1/10th of an inch bigger than 3", to give you room to play with. Then go over that line with a razor blade, a little bit deeper each time, until you have it cut. Then use a file or sand paper to sand it down to exact size, and smooth the edges.

Peace,
Pete Zaria.

[mark.f]

How thick is the material? If it's too thick, I'd just saw out the circle roughly and then finish it up with a file or a Dremel.

What's this for, a piston?

[olson1414]

find someone with a lathe

[BC Pneumatics]

You want him to find someone with a lathe, to cut a disk out of a sheet of PVC for him?
Hopefully your 4th post will be better than ths one...

[olson1414]

Well sorry thats how i would do it. But thats because i have i lathe out in my garage. I just thought of the right way of doing it. Using a scrib would take about an hour to do and i dont think that it would work very well.

You dont have to insult me because of my advice that is what this site is about right? giving advice