& OSTAR FAQ items are listed below: If you have a question
that isn't on here, please call our technical services department
you’re into case modding or need to make lockset cutouts in
new doors, hole saws are the perfect tools to have on hand for cutting
clean, symmetrical, circular holes in everything from wood and metal
to drywall and plastic. Tiancheng & OSTAR wants your next hole-cutting
project to be as simple and frustration-free as possible, so we’ve
put together answers to some of the most frequently asked questions
on hole saw use.
type of drill is best for use with hole saws?
saws are essentially cylindrical bits that are capable of cutting
perfectly round holes in materials like wood, plastic, drywall, metal,
fiberglass and acrylic. Hole saw bits can’t do much on their
own; they rely on handheld drills to supply the power and rotation
needed for hole cutting. Since drills are the driving force behind
hole saws, it’s important that you use one that can stand up
to the job.
as hand drills go, brand isn’t much of an issue, but power
is! For clean, consistent cuts, a good rule of thumb is to stick
with reasonably powerful drills of at least 14 volts. For cordless
drills, professionals often recommend upgrading to 18 volts to ensure
that you have enough power.
is a hole saw’s pilot bit so important?
to its name, a pilot bit guides the hole saw to exactly where it needs
to be, then keeps it on course until the job is finished. Without
a pilot bit, the hole saw would just spin and wobble over the object
you were trying to saw through, leaving you with a gouged surface
instead of a clean, round penetration cut.
bit is located at the exact center of a hole saw, and protrudes
a short distance beyond the saw’s toothed edge. The first
part of making a hole saw cut is to drill the pilot bit into the
center of what will become the hole. Sinking the pilot bit allows
the hole saw to anchor itself to the object being cut, providing
the saw with guidance and stability before its cutting teeth even
can I use a hole saw to enlarge an existing hole?
holes can be enlarged with a hole saw, but it’s a project that
requires a few extra steps. As we discussed above, having a pilot
bit lead the way is vital to keeping your hole saw steady and producing
clean cuts. When it comes to enlarging existing holes, one particular
challenge arises: there’s nothing solid to sink a pilot bit
This problem can be fixed with two
simple items: plywood scraps and a clamp. Just clamp a 1/4"
to 1/2"-thick piece of plywood over the existing hole. Mark
the new hole’s center point on the plywood, align your saw’s
pilot bit with the center-mark, and complete the hole cut as usual.
If you’re going to be boring through a door or similar object,
attach a second piece of plywood to the back as well: it will prevent
splintering when the saw emerges on the opposite side.
can I prevent my hole saw from becoming clogged with sawdust?
nothing like a sawdust clog to slow down a hole saw. When you’re
cutting through wood, it’s easy for particles to build up in
your saw’s teeth, causing it to overheat, work less efficiently,
and potentially burn out. Providing your hole saw with sawdust-relief
will not only prolong its life, but also ensures cleaner, neater cuts.
way to clear excess sawdust is to simply slow down your hole saw
and draw it back every so often, which cools the saw and allows
cutting-debris to spin off. If your project calls for more drastic
dust-removal measures, try the following trick.
drilling a pilot hole for your cut, use the hole saw to very lightly
score the wood’s surface. When the scoring is complete, remove
the hole saw and set aside. Next, drill several 1/4" holes
along the inner edge of the score line (keeping them within the
circle, and spacing them out around the perimeter). Make sure that
these holes penetrate completely through the work piece. At this
point, you can pick up where you left off with the hole saw…
you’ll be able to make a complete hole cut, and all of the
sawdust will automatically clear out through the ventilation holes.
Bi-metal Hole Saws
Speeds for Bi-metal Hole Saws