Extra Deep Hole Saw
By Benjamen Johnson
Browsing the FAMAG Catalog I came across this unusually deep set of hole saws. These hole saws were designed for drilling holes up to 300 mm (almost 12″) deep! If you have a problem ejecting the plug from a regular “short” hole saw, how are you ever going to get a 10″ plug out of one these extended hole saws?
FAMAG manufactures these bi-metal hole saws with a variable tooth pitch. To form the cutting head they weld high-speed steel teeth onto the cylindrical carrier. They sell the hole saws in 86 mm, 111 mm, 130 mm, 152 mm, 170 mm, 200 mm diameters which range from approximately 3-3/8″ to 7-7/8″.
You’ll drop anywhere from 175 to 425 Euros ($250 to $600) depending on which size you order. That’s not including the center spike which FAMAG sells separately for an extra 60 Euros ($85).
Deep Hole Saws [FAMAG]
Deep Hole Saws(PDF) [FAMAG Catalog (page 25)]
August 14th, 2009 at 9:47 am
I need some of these, but no way ma i paying that price….I need them for wood turning, and i can come up with another way to do it for that price…
ShopMonger
August 14th, 2009 at 10:07 am
“f you have a problem ejecting the plug from a regular “short” hole saw, how are you ever going to get a 10″ plug out of one these extended hole saws?”
Seriously, how do you do this? Better still how do you guys do it with regular plugs?
August 14th, 2009 at 12:42 pm
That just ain’t right, that’s a core drill bit on a regular drill.
August 15th, 2009 at 4:41 pm
you use two screws driven into the wood and pull back and forth on those two screws……also you remove the center drill first
ShopMonger
August 15th, 2009 at 4:42 pm
Also if you rock the bit a tiny bit as you drill, and take your time, it will come out smooth
ShopMonger
August 15th, 2009 at 4:42 pm
HAAA HAAA p.s. WAX YOUR HOLE SAWS
August 16th, 2009 at 1:36 pm
If you’ll look at the catalog, you’ll see that it says these aren’t for cutting solid wood thicker than 30 mm. They’re for cutting through multiple layers of different materials like wood and insulation.
August 16th, 2009 at 8:42 pm
@David Bryan:
Your right. From the Catalog:
“The chipping of solid wood thicker than 30mm and all sorts of stone and metal is not possible.”
It reads like a bad translation from German to English though.
————–
I have to admit when I first saw these I did think at first these were used for drilling holes in timbers, but then I figured they were used to drill holes through the side of the house for stuff like vents where you might have to go through siding, sheathing, insulation, several joists, etc….
Even if it wasn’t a solid plug it still is an interestin question how you’d get 10″ of varied materials out of these hole saws.
August 17th, 2009 at 2:22 am
Whatever happened to long shank adjustable bore auger bits? Why on earth would I want to dig a mile of wood out of a tube?
August 17th, 2009 at 12:29 pm
Brau
While we are big proponents of selfeed bits - we have had times where this tool might have helped drilling through:
Plaster wall, wood lath, empty wall cavity, old board sheathing, old siding, new sheathing, foam board, new siding.
August 17th, 2009 at 2:03 pm
Brau, I believe one point of these is that you don’t have to worry about keeping your holes lined up as you go through spaces and softer materials between the layers you’re penetrating, and you’re probably going to have either a good bit of space involved or some materials that’ll be pretty easy to get out of the hole saw. There’s really no point in using something like this on solid wood. And if I’m using a hole saw to cut through multiple layers I don’t wait ’til it’s full to get the slug out, just because I can.
August 20th, 2009 at 9:51 pm
[...] Extra Deep Hole Saw Browsing the FAMAG Catalog I came across this unusually deep set of hole saws. These hole saws were designed for drilling holes up to 300 mm (almost 12″) deep! If you have a problem ejecting the plug from a regular “short” hole saw, how are you ever going to get a 10″ plug out of one these extended hole saws? [...]
September 7th, 2009 at 2:18 am
Not only would it be impossible to get the plug out, these saw have no chip clearance, so that the sawdust has some place to go. And even if there were big gulleys between the teeth, they would eventually fill up.
You would have to feed it in a fraction of an inch, back it out and blow out the sawdust, then work it back in, and repeat, ad infinitum. Otherwise the thing will get hot enough to ignite the wood. No kidding.
I had a friend who used these things to cut round tenon ends on stick furniture. He would drill into the end grain of branches, then cut away the outside to leave a round tenon. He scorched a lot of wood, and it took friggin’ forever. Then he got a Veritas thing that shaved away the outside like a pencil sharpenter. That worked great.