This increase in drilling depth has been achieved by using the increased flute space of parabolic flutes and a thinner web.
To ensure depth capability the flute lengths of some diameters have been increased (above 9.0 diameter).
Swarf Breakage
By combining the unique point geometry and parabolic flute design, the swarf is broken into small, compact pieces which are more easily transported away from the cutting region.
Hole Surface Finish
Using the correct cutting conditions and the most rigid set-up, the surface finish produced is better than conventional drills.
Regrinding
The point geometry of both types of drill has been designed with ease of regrinding and thinning in mind.
(Heavy Duty and Extra Length have 130 degree points while Light Duty has a 120 degree point)
Hole Tolerance
The PFX drill design is capable of producing holes which are consistently within H10 tolerance. It is however necessary to ensure that good machine setup and correct cutting conditions are used.
Cutting Forces
The web design, which is thinned at the point, reduces the thrust required to penetrate through the work piece. The torque required is also reduced by the unique point geometry.
Geometry
The PFX range of drills has evolved using different geometry for specific applications:
For Heavy Duty materials the curved cutting edge with special thinning ensures the material is chipped efficiently reducing the cutting forces on the drill. The web gives strength behind the point allowing for increased penetration rates.
For Light Duty materials the curved cutting edge is maintained alongside a unique, open thinning design which encourages these notoriously stringy materials to break into manageable chips.
When drilling the deeper holes, up to 15 x diameter, the parallel web on the Extra Length drills affords generous flute space combined with adequate strength while the point geometry ensures the drilling accuracy is maintained throughout the depth of the hole.
Heavy Duty PFX A927, A907 & A916
The thicker web, parabolic flutes and strong point geometry combine to produce a drill capable of reaching high cutting conditions in tough materials whilst achieving greater drilling depths in one pass.
Light Duty PFX, A918
The thinner web along with the parabolic flute affords more space to remove material at much higher rates. The open point geometry is designed to break the long swarf of these materials giving much safer machining.
Extra Length PFX A976, A977 & A978
Three ranges of drills are available in Extra Length; DIN 1869-1, DIN1869-2 and DIN1869-3. The parallel web gives strength to the drill so it can maintain a straight line when drilling deeper holes and the point geometry ensures accuracy and hole size.
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