How to Bend
Which bend looks neater? Smoother? More professional?
After you've mastered the basics
of making PVC projects, here's how to form PVC pipe into the shape you want. Actually, it's pretty easy once you
learn the way I've been doing it. No need to spend hundreds of dollars on specialized PVC pipe bending equipment...
everything necessary to get set up should cost less than $35!
First, here's how not to bend PVC pipe.
Now, the right way...
Basic Tools Needed
1/2 or 3/4-inch PVC Pipe
To practice, cut a length of
3/4-inch diameter (1/2-inch works as well) PVC pipe, about 3 feet long, then lay it on a flat surface... garage
floor, sheet of plywood or whatever. (Read "Is Working with PVC Safe?")
Turn the heat gun on high, place
the "business end" about an inch, or thereabouts, from the section of pipe you want to heat. (If you
get too close, you'll likely burn the pipe.) Slowly turn the pipe and move the heat gun back and forth 3 or 4 inches
in each direction.
Be sure to wear a good pair of leather
gloves and work in a well-ventilated area.
You'll see that, in just a minute
or so, the pipe becomes malleable. Turn off the heat gun, pick up the pipe and slowly curve it to the desired shape.
See how the pipe kinks? Not good.
So Here are Three Inexpensive Solutions
Sand. Use clean sand that you can
get from most any hardware store. Or pick up a small bucketful of sand from a yard and garden shop, from the beach,
Next, fit a PVC cap onto one end of the pipe, fill it with sand and tamp it down
(I use a wooden dowel). Then place another cap on the opposite end.
NOTE: Do not glue the caps to the pipe.
Heat the pipe as described above.
The sand evenly distributes the heat and will keep it from kinking. Bend the pipe, then let it cool for a couple
No Sand... Bad
TIP: You can speed-up the cooling process by wiping a wet
sponge on the pipe.
TIP: Pull the pipe just a smidge beyond the desired radius.
Because of the recovery characteristics of PVC, the pipe will often "spring back" slightly after cooling.
Instead of sand, you can insert a
spring, such as the Pipe Viper. For large diameter
pipe, I insert a used garage door spring. I acquired a couple of them free that were discarded by a garage door
Follow the directions above.
TIP: Attach a wire, or small chain, at one of the spring to
aid in removal after the pipe cools.
Recently, I tested a nifty new tool
called PVC BendIt®. If you do a lot of bending – and don't mind spending a bit of money
– you'll find this little beauty indispensable.
Take a look at the bends I easily
made in the 1/2-inch and 1-inch pipe. Each bend took about 40 seconds.
One of the things I like about the
BendIt device is you don't need to insert sand or a spring when bending, which makes it easier and quicker
to bend the pipe.
You should check it out. And tell 'em Brooks sent you. (No, I don't get a commission. It's just a cool tool to own.)
Make Your Own
Next thing to know is how to
get the same radius each time you bend the pipe when you make duplicate projects. Or, for example, the same curve
for arms of a chair.
For that, you’ll need to build a
simple bending jig. Cut a sheet of plywood into a 3-foot square. (Depending on your project, the square can be
bigger, or smaller.) On the plywood, pencil in the radius you want to bend. Then, hammer in a few nails along the
Prepare the pipe as before, heat
and, when ready, place the pipe alongside the nails and bend. Repeat to make as many duplicates of the bend as
TIP: Hammer a nail on the opposite "side" of the
pipe at each end to hold the bend in place while it cools.
To make a more permanent jig, cut
a few short lengths (three inches, or so) of 3/8-inch diameter wooden dowels.
Draw a two-inch grid pattern on the
plywood, then drill holes at each intersection. Tap the dowels into the holes. You can then move them around for
various radii. The tighter the grid pattern you draw, say one-inch instead of two-inch, the more variation you
Here’s one more way to make a PVC
pipe bending jig...
On the left-over sheet of plywood,
draw your radius and cut it out with a jig saw. You can make several different curves with the rest of the plywood.
Then nail the piece to the 3-foot square sheet of plywood, heat the pipe and bend. Again, tap in a nail at each
end of the pipe to hold the bend in place while it cools.
Bending PVC Pipe Made
Easier... Much Easier
To make bending easier, quicker and
to get all kinds of radii, I've come up with an simple-to-build bending jig that utilizes a "peg system."
And it's pretty slick.
The tool can be made with scraps. But, if you have to purchase the materials, the
cost should be under $20. I've put full color photos and directions into a manual that details exactly how to make
the jig in just a couple of hours. You can read more about it here.
Anyway, with a bit of practice, you'll
soon be bending plastic pipe into all kinds of shapes.
Just imagine what you can
do with PVC pipe. The possibilities are endless!