Stub Drill Sets
Dormer PFX HSS-E Deep Hole Drills
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HSCo high performance Jobber length drill for machining deep holes in most materials up to x6 diameter.
-Parabolic flute design enables rapid chip evacuation
-Allows greater drilling depths without the need for 'pecking'
-130° special point geometry for excellent centring capability and reduced thrust requirements
-Thicker web design gives increased structural strength resulting in a much lower risk of drill breakage
-Manufactured to DIN338 standards
The Dormer A900 jobber-length drill bit is a 130-degree, PFX point, round shank drill bit made of high-speed steel (HSS) and cobalt. It can drill holes up to six times the diameter of the drill. The shank diameter is the same as the drill size. It is recommended that ER collets be used in the following size ranges: 3/64” – 25/32”, A – Z, 60 – 1, 1.0 – 20.0mm.
The A900 series has a type W flute form, with a fast helix angle of 35 to 45 degrees, and are most suitable for drilling into steel, stainless steel, titanium, nickel, and alloyed aluminum. This design allows for single-pass drilling, which helps eliminate the need for pecking in up to six times the drill diameter deep holes, thus offering improved efficiency and increased productivity. The composition of HSS and cobalt offers a combination of toughness and hardness needed for deep hole drilling. The parabolic design, combined with a parallel thinned web, allows for smooth and efficient chip removal. With proper cutting conditions and a rigid machine setup, holes to H10 tolerance can consistently be achieved.
The uncoated finish helps increase chip flow. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. The right-hand twist brings chips up and away from the cutting edge.
Made of HSS with cobalt which is many times harder and stiffer than HSS, will hold an edge longer, and will deflect less and are more resistant to heat than HSS. These qualities allow it to run at higher speeds and feeds. They are made to ANSI and DIN industry standards, which help ensure that drill bits around the world conform to the same specifications.
Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit used. Twist drill bits are commonly used to drill holes with hand-operated drills, standalone drill presses, or lathes.
- Deep hole drilling without the need for pecking up to 10 x D - reduced cycle time.
- High levels of productivity across a wide range of materials.
- Efficient chip evacuation, assisted by parabolic flute geometry and Smooth-Flow coating, results in continuous production process.
- Exceptional tool life, in particular on the Smooth-Flow coated ranges.
- Consistent hole size and hole quality.
- Low thrust force means reduced power requirements
- Jobber-length, for a wide range of applications
- 130-degree point angle has good centering capabilities and reduces pressure on cutting edges
- High-speed steel (HSS) containing cobalt for a combination of toughness and hardness, and for use on drilling into hard materials
- Uncoated (bright) finish, for use with a wide range of drilling materials
- Round shanks, for use on a variety of tool-holding systems