Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY.
A good starter set of drill bits should include at least a small index of twist drills and a set of spade bits. Like sawblades, drill bits come in lots of flavors, suited to drill through just about anything.
The cutting edge (called the lip) is at the tip where the mouths of the flutes meet the workpiece.
Some countersink drills can be purchased with adjustable stop collars that can be set to halt the drill’s progress at a fixed depth.
Hole saws handle the work in the gray area between the smaller holes best made with twist or spade bits (those roughly an inch in diameter and smaller) and larger ones (three or four inches and up) that are sawn most easily with a saber saw. These bits are used to cut relatively small holes (typically three-quarter-inch or less) in masonry, either to run cables or piping through, or for mounting plugs or shields for attaching shelves or other materials to the masonry. At Ocean Machinery we are committed to providing you as many options as possible with regard to drilling with your Ocean Avenger or any other CNC Beam Drill Line.
If you are not sure whether to use Twist Drill bits or Insert Drill Bits on your Drill Line, please take a look at The Big Debate - Insert Drill Bits vs. Ocean Machinery's huge buying power results in the lowest cost per drill to our customers. Call Ocean Machinery at 1-800 286 3624 today to order your drill bits for your Ocean Avenger or other CNC Beam Drill Line.
These Cobalt drills are the newest drill bits we offer, and are made specifically for CNC Beam Drill Lines. We tested this COBALT Structural Steel drill bit in early August 2006 and drilled 490 holes in 1 hour.
We also drilled more than 500 holes and the drill was still drilling holes at less than 8 seconds per hole.
The Ocean PENETRATOR COBALT Drill Bits arrive from the factory pre-sharpened to 170 degrees with a split point. You will need to grind the exit of the hole as the insert drill bits are radiused at the tip - this leaves a significant burr that must be ground prior to bolting. We at Ocean Machinery are often asked by our customers what drill bits should they use - twist drill bits or insert bits? Simplicity - They can just be discarded when dull and they are cheap to replace - around $30 every 800 - 1000 holes.
Cost - Insert Drill require holders for each drill size and you require at least two holders of each size.
Cost - Insert bits definitely leave a burr on the exit of the hole, especially on lighter profiles and the fabricator must spend money on labor and consumables to grind the exit of the hole. Cost - If an insert breaks, the tool holder will be damaged and will have to be replaced - replacing tool holders is expensive.
Cost - If the Torx head holding the insert is stripped you have to replace the tool holder - replacing tool holders is expensive. Convenience - It only takes a couple of hours to train an operator to be able to sharpen drill bits. The drill features a chip breaker design that quickly breaks off the chips into small manageable pieces and avoids the long stringy chips that normally plague drill lines.
The Ocean Penetrator drill bits feature oil coolant holes that run through the drill bit to cool the center of the drill while it is drilling through all structural steel profiles including beams, channel, angle, plates, tube, etc. We are also now able to supply the Ocean Penetrator drill bits with a factory sharpened 170 degree drill point3 as opposed to the standard 135 degree drill point. The resharpening of the drill bits is a simple one-step process on the Rush 250 A drill grinder available from Ocean Machinery.


1 Actual tool life will vary based on a variety of factors including drill diameter, thickness and hardness of material being drilled, drill RPM, drill feed rate, drill sharpening quality, and other factors. Call the Ocean Machinery sales team TODAY at (954) 956-3131 or Toll Free 1 (800) 286-3624 or fill out our online info request form for more information on the OCEAN PENETRATOR DRILL - BITS FOR STRUCTURAL STEEL . Special Hi-Molybdenum tool steel Substantially longer cutting life Nitro-carburized flute has increased Rockwell hardness & will out perform cobalt Cuts harder material The flatter point takes a smaller chip.
Ours professional high quality auger bits can drill through those nail-embedded wood, hard wood, chipboard, plywood, PE, PVC, PP, laminated board, etc. Various shank types are available on customer's requests, such as SDS-plus, Hex, Quick Change Hex Shank, etc. In the package of double blister, plastic tube, single blister, skin pack, color box, injection case, Al case, blow case, etc. Previously only available from industrial suppliers for ~$60, this 10-piece impact drilling set is now available on Amazon for $38. You can also use these bits in an ordinary non-impacting drill, but you’ll get more out of your money using standard bits, such as these¬†Dewalt Pilot Point drill bits¬†that we recommend.
The thing about these drill bit sets is that all I see is the empty space inside the plastic case. The reason that they include the case is not for our benefit, but rather it gives more frontage to the packaging. Other brands, Bosch included, have a few bit cases that are as space-inefficient as this one. I have one or two Bosch canvas sleeves, and while they come in handy, I’m not a huge fan of them. Please consider updating your browser to the latest version of Internet Explorer or Google Chrome. Depending upon your needs, you’ll probably want to have several different types on hand, but a good starter set of drill bits should include at least a small index (perhaps ten drills) of twist drills and a set of spade bits (perhaps six pieces). Twist drills were invented by a fellow named Morse, and some machine shop types refer to a twist drill as a Morse drill. Carbon steel bits are ground specifically for drilling wood and should not be used to cut metal. These bits look like their name suggests: Each steel shaft terminates in a spade-shaped blade.
Spade bits are for wood, plywood, and some plastics, and cut quickly with surprising precision. Designed specifically for cutting wood, brad point drills are a cross between spade bits and twist drills.
Hole saws cut wood, plastics, and a variety of metals, including iron, steel, and aluminum. However, they are essential for others, like mounting hinges that must be recessed into a round hole that extends only partway through the door stile. These are designed for drilling concrete, brick, stone, plaster, and other masonry materials that would quickly dull or fracture most drills. We are able to ship directly from our warehouse to your shop, and if you get in your order before 4pm EST we will normally be able to ship the same day.
The Ocean Penetrator is a taper shank twist drill bit specifically designed for fast productive drilling of structural steel profiles with CNC beam drill lines of all types. Our customers average anywhere from 300 to 500 holes per sharpening, and are able to get more than 100 sharpenings per drill bit. This further improves the drilling speed, increases the number of holes that can be drilled before resharpening, and increases your overall profitability.
To obtain the best performance the drill must be sharpened to a 170 degree drill point geometry.


The operator is able to easily resharpen drill bits in less than 2 minutes and this is normally done while the CNC drill line is running, meaning that the drill resharpening is done during operator idle time. DIYTrade accepts no responsibility whatsoever in respect of such content.To report fraudulent or illegal content, please click here.
Bits are held in a tool called a drill, which rotates them and provides torque and axial force to create the hole.
While I’m not a fan of hex-shanked drill bits, these uni-bodied bits were actually quite decent.
Dewalt’s smaller bit sets come in smallish Tough Cases, but your point about the empty space still stands.
It does rattle a little when carried, so I don’t usually store any sharp drilling or cutting bits in there, only screwdriver bits and random accessories.
The ones I have just can’t hold enough to be worth the trouble, so I had to repurpose a larger case.
Twist drills are commonly sold in sizes ranging from a sixteenth of an inch up to half-inch diameters. Use them only at high speeds, to prevent the bit from catching in the workpiece and the drill from trying to wrench itself from your grasp. The shaft of the drill resembles the twist drill, with fluted chip channels spiraling around the shaft. Countersink drills have profiles to match the shape of the screws: The holes they drill taper gradually along the length of the screw, then enlarge, allowing the heads of the screws to be set (countersunk) into the wood. It is used to cut small plugs from the same wood; the plugs can then be inserted into the screw holes after the screws have been sunk in order to camouflage their presence.
The mandrel is a shaft to which the blade is attached; the mandrel is gripped by the chuck of the drill like the shaft of any other bit. Rather than having a steeply ground tip that is followed by angled cutting edges, the Forstner bit is guided by the rim. This yields in excess of 30,000 holes per drill bit resulting in significant savings and improved overall fabricating profitability. This is ideal for structural steel and results in burr free holes that further reduces costs by eliminating the costly grinding of the exit hole.
A pair of helical flutes (sometimes called chip channels) run along two-thirds of its length, twisted around the shank like the stripes on a barber’s pole. The point acts as a guide, centering the hole and leading the way, but the bulk of the drilling is actually done by the honed cutting edge at the shoulder of the spade. Spade bits are found in the range between quarter inch in diameter to one and a half inches. Most of the cutting is done at the lips of the channels, but the hole is actually started with a smaller-diameter brad point (or spur) that leads the shaft into the hole. On the Ultra Bor™ Super Premium products, they routinely cut recognized tool tolerance standards by one half to insure that their customers receive drills manufactured to the tightest possible specification and utmost in consistency and accuracy. The fit is not quite as secure as if I were to use a standard jobber-length twist bit in a 3-jaw drill chuck, but it’s fine for most applications. The channels are usually cut deeper on brad point drills that on twist drills, in order to clean out the wood debris. A comprehensive drill bit and tap size chart lists metric and imperial sized drill bits alongside the required screw tap sizes. The term drill may refer to either a drilling machine or a drill bit for use in a drilling machine.




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