Embodiments described herein relate to material-removal systems and cutting tools that may be used in the material-removal systems. More specifically, for example, the material-removal systems, and particularly the cutting tools thereof, may engage and fail target material. In some instances, the material-removal systems may be used in mining operations.

The invention relates to a milling pick, in particular a round pick having a pick head (40), which has a pick tip (30) made of a hard material as a cutting element, wherein furthermore a pick shank (10) is provided, which is coupled directly or indirectly to the pick head (40), wherein a wear-protection disk (20) is provided, the cut-out of which, in particular a drilled hole, is pushed onto the pick shank (10),

wherein the wear-protection disk (20) has, on its side facing the pick head (40), a counterface (23), which is designed to come into contact with a bearing surface (41) of the pick head (40), wherein the wear protection disk has, facing away from the counterface (23), an underside support surface (21), which is preferably parallel to the counterface (23), and wherein a disk thickness (d) is formed between the counterface (23) and the support surface (21),
is characterized in that the ratio of the diameter of the pick shank (10) located in the area of the cut-out (25) to the thickness of the disk (d) being in the range from 1.5 to 3.75, preferably in the range from 2 to 3.

The invention relates to a milling pick, in particular a round pick having a pick head (40), which has a pick tip (30) made of a hard material as a cutting element, wherein furthermore a pick shank (10) is provided, which is coupled directly or indirectly to the pick head (40), wherein a wear-protection disk (20) is provided, the cut-out of which, in particular a drilled hole, is pushed onto the pick shank (10),

wherein the wear-protection disk (20) has, on its side facing the pick head (40), a counterface (23), which is designed to come into contact with a bearing surface (41) of the pick head (40), wherein the wear protection disk has, facing away from the counterface (23), an underside support surface (21), which is preferably parallel to the counterface (23), and wherein a disk thickness (d) is formed between the counterface (23) and the support surface (21),
is characterized in that the ratio of the diameter of the pick shank (10) located in the area of the cut-out (25) to the thickness of the disk (d) being in the range from 1.5 to 3.75, preferably in the range from 2 to 3.

The invention relates to a milling pick, in particular a round pick having a pick head and a pick tip, consisting of a hard material, wherein the pick tip has an attachment area, which is used to connect it to the pick head, wherein the pick tip has a concave area, which extends in the direction of the central longitudinal axis of the pick tip, and wherein the concave area has an elliptical contour. To achieve an improved resilience for such a milling pick, provision in made in accordance with the invention that the ellipse generating the elliptical contour is arranged in such a way that the semimajor of the ellipse and the central longitudinal axis of the pick tip form an acute angle.

The invention relates to a milling pick, in particular a round pick having a pick head and a pick tip, consisting of a hard material, wherein the pick tip has an attachment area, which is used to connect it to the pick head, wherein the pick tip has a concave area, which extends in the direction of the central longitudinal axis of the pick tip, and wherein the concave area has an elliptical contour. To achieve an improved resilience for such a milling pick, provision in made in accordance with the invention that the ellipse generating the elliptical contour is arranged in such a way that the semimajor of the ellipse and the central longitudinal axis of the pick tip form an acute angle.

The invention relates to a tool combination consisting of a chisel holder, which can be fastened to a milling drum of a soil tillage machine, and at least one leading and one trailing chisel, which are retained on the chisel holder, wherein the trailing chisel is arranged after the leading chisel, based on a working movement of the tool combination in use in the soil tillage machine, and wherein each chisel has a chisel tip having a cutter. According to the invention the trailing chisel tip of the trailing chisel has, at least in some areas, a greater hardness than the leading chisel tip of the leading chisel. Thus stoppage times of the soil tillage machine for maintenance can be reduced and the loss of chisels can at least be decreased.

The invention relates to an interchangeable chisel holder (40) which can be fixed to a milling drum (15) of a ground-working machine (10), having a forward chisel holder (42) for the interchangeable holding of a forward chisel (20), preferably a round-shaft chisel, and having a rearward chisel (30, 31), which is held on the interchangeable chisel holder (40), wherein, as based on a working movement (76) of the interchangeable chisel holder (40) when used in the ground-working machine (10), the rearward chisel (30, 31) is arranged behind the forward chisel holder (42). In such an interchangeable candleholder (40) provision can be made, according to the invention, for the rearward chisel (30, 31) to be held on the interchangeable chisel holder (40) axially and fixed in the circumferential direction of the chisel holder. Maintenance-induced stoppages of the ground-working machine can thus be reduced and the loss of chisels can at least be lowered.

The invention relates to an interchangeable chisel holder (40) which can be fixed to a milling drum (15) of a ground-working machine (10), having a forward chisel holder (42) for the interchangeable holding of a forward chisel (20), preferably a round-shaft chisel, and having a rearward chisel (30, 31), which is held on the interchangeable chisel holder (40), wherein, as based on a working movement (76) of the interchangeable chisel holder (40) when used in the ground-working machine (10), the rearward chisel (30, 31) is arranged behind the forward chisel holder (42). In such an interchangeable candleholder (40) provision can be made, according to the invention, for the rearward chisel (30, 31) to be held on the interchangeable chisel holder (40) axially and fixed in the circumferential direction of the chisel holder. Maintenance-induced stoppages of the ground-working machine can thus be reduced and the loss of chisels can at least be lowered.

A unitary bit/holder assembly includes a bit tip insert having a diamond coated tip mounted thereon that is received in a transition member that is brazed onto a forward end of a bit holder. The forward end of the bit holder includes a trough onto which the transition member is mounted. The unitary bit/holder includes a standard length shank or a shortened length shank that can each be mounted into a shortened base block.

A diamond coated tip for a non-rotatable bit/holder for road milling operations that includes an overlay of diamond material and a base. An outer surface of the overlay including a tip, at least two parabolic sections, and a generally cylindrical section. The overlay can also include an overfill portion of adjacent the generally cylindrical section.