By optimising the cutting ratio A & B for the outer and inner inserts, deformation of the tool body can be controlled. Additionally, the uniformity of the cutting ratio A and B; across all diameters, reduces variations in performance.
Extra body thickness positioned behind the inner edge helps to resist the principal force and therefore prevents twisting and deformation during the initial cutting.
Chip evacuation when drilling deep holes is improved with specially designed through coolant holes that maintain coolant pressure.
The cutting edge has both sharp and strong type geometry along its length for improved fracture resistance. The radius design also achieves excellent fracture and welding resistance.
The unique wave design allows smooth chip discharge.
An all-round breaker for steel, stainless steel and cast iron.
Outstanding chip discharge is achieved by the breaker which was designed to focus on sharpness, and the sharp edges achieved by grinding. Aluminum welding is also prevented by smoothing that has been performed on rake surfaces.
The strengthened cutting edge and Ti-Al-Si coating provide astounding stability even when cutting hardened steel (up to 45HRC) or general steel.
The peripheral cutting speed is naturally slower towards the center of the drill and chip welding easily occurs.
Below are some important points that will help to select the correct insert.
For steel and cast iron
Please use the UM breaker.
For the outer edge, use the CVD coated grade MC1020 for steel applications and the MC5020 grade for cast iron. For the inner edge the PVD coated grade VP15TF should be used. If fracturing occurs, VP15TF should be used for both positions to give extra stability.
For stainless steel
For the best performance use the UM breaker for the peripheral edge and the US breaker for the inner edge. The selection of grade should be the same as used for steels.
For Hardened Steel and Preventing Fracture
For the inner edge, UH is the ideal breaker.
The high-strength, highly negative wide land edges, together with the durable PVD coated carbide grade DP8020, are suitable for machining hardened steel (45HRC or lower) and preventing fracture in steel and cast iron.
For Aluminum Alloy Processing
For both the inner and outer edges, UN breakers are ideal.
The polished finish and peripheral polishing prevent welding, and the combination of the positive lands and high rake angle further enhances the sharpness.
MVX has double tool life compared with conventional products when using US breaker for the inner edge.
MVX drill achieved 3 times longer tool life compared with conventional products when drilling carbon steel.
MVX has 4 times longer tool life compared to conventional products,
especially when using MC5020 grade outer inserts.
MVX has double tool life compared with conventional products.
MVX corresponds to changes in cutting speed and feed rate.