WHAT TURNS A DRILL BIT INTO A HELLER HIGH-QUALITY DRILL BIT!
* Consitent alignment with what customers want, patented products and constant product development ensure drilling tools of the highest technological standard
*The use of paticularly high-quality steels and tungsten carbides, specially developed for drill bit production
*Surface treatment processes developed in -house ensure optimal drill bit stability and long service life.
* Extremely modern, highly-automated production plants ensure precise and constant product quality
* Certification since 1995 to DIN EN ISO 9001:2000 guarantees the orginizational integration of important rules for reliable processes, constant quality as well as sustained occupational safety and environmental protection.
* Up-to-date packaging and presentation turn our tools into products with great brand characteristics
*The enthusiasm and commitment with all Heller employees identify with and embrace our demands for high-quality drill bits
* The label "Heller Quality- Made in Germany" is a reliable seal for superior product quality
* In short: there are drill bits and then there are Heller drill bits. Heller has been producing superior quality for more than 400 years
OUR GLOBAL PRODUCT TRIALS ARE COMPLETE...
When we developed our new SDS-Plus hammer bit, we were convinced we had a winner. Our own rigourous tests consistently highlighted its exceptional speed, power and durability.
But we wanted YOU to be the judge.And so we invited our customers around the world to put our latest innovation through its paces in our biggest ever product trial.
You took up the challenge in your thousands.You gave the product the toughest examination possible by testing it where it matters most - in real working conditions!And you suggested a name that reflects its exceptional performance.
The Bionic SDS-plus hammer bit from Heller has well and truly arrived!
The result of the product trials has been an unprecedented success. The new Heller Bionic SDS-plus hammer bit has shown its metal in the most demanding jobs. In hard metal, green concrete, reinforced concrete and embedded steel beams. You name it the Bionic SDS-plus hammer bit has proven to be a breakthrough in drill bit technology; our customers feedback has been conclusive. The new Bionic SDS-plus hammer bit is a world-beater.
Try it yourself. And you too will never want to use anything else.
...THE RESULTS SPEAK FOR THEMSELVES
In our exhaustive trials we benchmarked the Bionic SDS-plus hammer bit against leading brands including Bosch / Hawera S4, Drebo 4 Plus, Hilti TE-CX and others. The results were verified by Prof. Burkhard Heine of the leading independent testing institute, Steinbeis Transferzentrum, Aalen Germany, confirm what we knew all along.
The Bionic SDS-plus hammer bit from Heller sets new standards in hammer bit performance and durability
Y-Cutter
...the Heller Hammer Bit with its Revolutionary Cutting Head
* More by three cutters in Y-configuration
Contrary to the 4-cutter drilling head of a traditional hammer bit , the Y-cutter shows an asymmetric cutter configuration with three cutters. This special arrangement results in less friction loss and increased cutting capacity. The spoil removal capacity has increased by as much as 38%. Large flutes remove the drilling spoil repidly from the cutting space. Material congestion in the cutting area slowing down the output capacity is definitely avoided.
* Up to 30% faster drilling speed
The high performance cutting geometry and the unhindered spoil removal which is due to the large spoil flutes guarantee convicing measuring results; Already after 95 seconds a Y-cutter with a capacity of 35mm penetrates concrete B 45 up to a drilling depth of 25cm !
* Up to 27% more holes
Significantly longer life of the Y-cutter thanks to the drastically reduced wall friction of the bit and to the minimised wear of the cutter. This is a strong argument for drilling pros. Because 27% more holes mean money, money which is not spent. In other words: Real profit.
* Lower vibration and reduced noise
The 4 -cutter runs considerably smoother than the traditional X-cutter. This is an additional advantage of the useful structuring of the 3-cutter. Lower vibration and reduced noise not only means more relaxed work, but it also relieves the muscular system and the joints: Ergonomics friendly Y-cutter!
Advisor on Drill Bits
Standard Bits or Regular Point drill bits have a 118 degree included angle point with cutting relief angles suited to cut metal or wood. It is designed to be an all-purpose point to cut most all materials.
Twist Drill Bits with 118 degree V-point are the standard, general-purpose bits, good for drilling wood, metal and plastics. They are excellent for cutting holes in end grain and are easy to sharpen.
 Twist Drill |
Brad Point Bits for wood only. Better for cross-grain cutting than the traditional twist drill bit. A brad point bit will leave a cleaner hole, won't walk at start of cut or drift during the cut. The Brad in the center of the point allows accurate positioning when starting a hole even if the hole is not 90-degrees from the surface. The outlining spurs sheer the wood grainand leave a clean edge around the opening of the hole, eliminating the need for sanding. In most woods, the spurs also help to produce a cleaner edge when drilling through the backside of the wood.
Taper Point Bits are designed specifically to pre-drill for the shank and threads for standard wood screws. Available in sizes and lengths to cover a wide variety of screws.
Forstner Bits are best for cutting through thin stock, cutting a flat-bottomed hole, cutting overlapping holes (for mortising and removing stock), for drilling at angles, including angles over 45 degrees, and for angled partial holes. Use them in portable drills or in a drill press.
Auger Bits for hand drilling in wood. The lead screw pulls the bit into the wood allowing the operator to focus more on sighting the angle and less on feed pressure. Recommended for cutting deep holes. Not for use on a drill press. Two different shanks available: square for bit brace, hex for hand and electric drills.
Types of Metal for Drill Bits
Carbon Steel is the softest and the least expensive metals that we offer. Also can include High Carbon Steel and High Alloy Steel. many craftsmen like Carbon Steel because it is soft enough to sharpen with a file. Fuller manufactures tools from Carbon Steel that are heat treated to 62c hardness and can not be sharpened with a file. A stone type of a ginding wheel is required to sharpen them.
Stainless Steel is not normally used to manufacture tools. However, there are some applications where the spring steel quality keeps the tools from breaking and are not that much more expensive than the Carbon Steel.
High Speed Steel, sometimes abreviated HSS, comes in a variety of different grades generally used in the metalworking industry to make drills, turning tools and other tools to cut metal. In woods and plastics, all grades of HSS far outlast the cheaper Carbon Steel or Stainless Steel. Tools made of High Speed Steel will always have HS or HSS stamped on them. Don't be fooled by imitations! We recommend HSS for most applications because the tools are reasonably priced, last a long time in woods and plastics and have more sizes and lengths available than any other materials. However, if you are cutting thousands of holes in a production application you will need some type of Carbide Tooling.
Carbide Tipped is the materail of choice for high production applications.Carbide is super hard, resharpenable and replaceable. Carbide can cut faster at higher spindle speeds because it is impervious to the heat produced at those speeds.Since Carbide is so hard it is also very brittle and will tend to chip.
Drill bits from zero to one half inch are sized in four ways; fractions, wire gauge numbers, letters, and metric in millimeters. You will see drill bits with a fraction, number, letter or metric number stamped on their shank indicating their size. The fractions range from 1/64 inch to 32/64 inch. The numbers range from 107, (smallest) to 1 (largest). Where the number 1 drill bit leaves off the letter A (smallest) begins and continues through the letter Z (largest). The metric sizes are dispursed throughout. All of these drill bits are different in size except for the 90 and .22mm which are both 0.0087 inches in diameter, the 85 and the .28mm which are both 0.0110 inches in diameter, the 13 and the 4.7mm which are both 0.1850 inches in diameter, the 4.8mm and the 12 which are both 0.1890 inches in diameter, and the 1/4 inch and letter E bits which are both 0.250 inches in diameter.
| Drilled Part Design |
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The following are guidelines for drilled part design.
- Advantages of drilled holes include accuracy and sharpness of edges. Since machining is expensive compared to other manufacturing processes, drilling to create a hole should be justified by looking at alternatives. Before adding drilled holes to a design, ask yourself whether the hole is needed and/or whether it can be cast, molded, or pierced with sufficient accuracy instead of drilled.
- Specify standard drill bit sizes. Unusual hole sizes bring up the cost of manufacturing through purchasing and inventory costs.
- Through holes are preferred over blind holes. This has to do with the fact that a blind hole does not provide as much leeway for chip exit and cooling. Operations such as reaming and threading after drilling are more easily conducted on a through hole.
- Do not specify flat-bottomed holes. Twist drills create cone-bottomed holes and flat-bottom holes cause problems with reaming, etc.
- If possible, do not specify holes that are smaller than one-eighth inches in diameter. Drills for smaller holes tend to break and for convenient mass production, are not recommended.
- For large holes, try to cast in a preliminary hole that must only be bored out to specification. This saves material, transportation cost, and drilling cost.
- When dimensioning holes, it is better to use rectangular rather than angular (or polar) coordinates. Angular coordinates will require the machinist to set up a dividing head or to re-dimension the part, both of which take time.
- Minimize the number of drilled hole sizes so that tool changes are minimized.
- Minimize the number of directions on the part that holes must be drilled from.
- The entrance and exit surfaces of a drilled hole should be perpendicular to the hole axis. The reasons for this are as follows:
- Upon entrance of the drill, the drill tip will wander if the surface that the tip contacts is not perpendicar to the drill axis.
- Exit burrs will be uneven around the circumference of the exit hole. This can make burr removal difficult.
Bad and good examples of entrance and exit lands are shown in the figure below.
- Intersections of drilled holes with other cavities should be avoided if at all possible. If interesection with a cavity is unavoidable, the drill axis should at least be outside of the cavity, as shown below.
- On drawings, multiple holes in a flat surface should be located from the same horizontal and vertical datums.
- If there are protrusions surrounding a drilled hole, it may be difficult to bring the drill press head close to the entrance surface, resulting in a drill bit that is prone to wandering, chatter, and other instabilities. This problem can be solved by providing a fixture with a drill bushing close to the drill bit. However, part design must allow for this fixture, as shown below.
- Drilled Hole Depth:
Deep, narrow holes with length to diameter ratios of larger than three should be avoided. Deeper holes are possible but the drill will tend to wander and possibly break. one way to avoid a deep, narrow hole is to use a stepped entrance. Blind holes should be drilled to a depth 25% deeper than the actual hole in order to provide space for chips.
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