DE102012106442A1 - Chamfering system i.e. modular chamfering system, has drill-part releasably fixed over two bracing elements e.g. cylinder pin, in carrier- or shaft part, and cutting part releasably fixed in carrier- or shaft part over third bracing element - Google Patents

Abstract

The system (1) has a carrier- or shaft part (2) for coupling to a rotation drive i.e. spindle. A spiral drill-part (3) i.e. drill bit, drills a drill hole. A cutting part (4) cuts a chamfer at or over the drill hole. The carrier- or shaft part and the drill-part are rotated by the rotation drive in a rotation direction at a rotational axis (D). The drill-part is releasably fixed over two bracing elements (5, 5') e.g. cylinder pin and clamping wedge, in the carrier- or shaft part. The cutting part is releasably fixed in the carrier- or shaft part over a third bracing element (6).

Description

The invention relates to a barrel system, comprising a carrier or shaft part for coupling to a rotary drive, in particular to a spindle, a drilling part, in particular a drill, for drilling a borehole, and at least one cutting part for cutting a chamfer on or around the borehole.

As a rule, chisel drills are designed as monoblock tools made of high-speed steel (high speed steel HSS) or solid carbide (solid carbide). With increasing diameter but these are uneconomical due to the large use of raw materials and the processing time in the production. In addition, these tools can only be used for a very specific application, since neither diameter nor depth can be changed. Drills, in particular made of solid carbide, have hitherto usually been made in one piece.

From the prior art are the DE 10 2004 058 163 as well as the WO 90/04474 known.

The object of the invention is on the one hand to provide a new barrel system, which is particularly easy and flexible to handle.

The object of the invention is in particular to provide a barrel system in which a drilling part can be combined with at least one cutting part for cutting a chamfer so that both the diameter of the drilling part and the depth within certain limits are freely selectable.

The objects are achieved by a barrel system, in particular a modular barrel system, according to claim 1 of the invention, wherein in particular advantageous embodiments and developments result from the dependent claims.

• a) ein Träger- oder Schaftteil zum Ankoppeln an einen Rotationsantrieb, insbesondere an eine Spindel,
• b) ein Bohrteil, insbesondere einen Bohrer, zum Bohren eines Bohrlochs,
• c) wenigstens ein Schneidteil zum Schneiden einer Fase am oder um das Bohrloch,
• d) wobei das Träger- oder Schaftteil und das Bohrteil durch den Rotationsantrieb in einer Drehrichtung um eine Drehachse drehbar sind,
• e) wobei das Bohrteil über wenigstens ein erstes Verspann-Element im Träger- oder Schaftteil lösbar fixiert oder fixierbar ist,
• f) wobei das Schneidteil über wenigstens ein zweites Verspann-Element im Träger- oder Schaftteil lösbar fixiert oder fixierbar ist.

According to claim 1, the invention relates to a drum system, in particular a modular drum system comprising

• a) a carrier or shaft part for coupling to a rotary drive, in particular to a spindle,
• b) a drilling part, in particular a drill, for drilling a borehole,
• c) at least one cutting part for cutting a chamfer on or around the borehole,
• d) wherein the carrier or shaft part and the drilling part are rotatable by the rotary drive in a rotational direction about an axis of rotation,
• e) wherein the drilling part is releasably fixed or fixable in the carrier or shaft part via at least one first bracing element,
• f) wherein the cutting part is releasably fixed or fixable via at least one second bracing element in the carrier or shaft part.

Preferably, the carrier or shank part is at least predominantly or completely made of steel and / or has a, in particular along the axis of rotation, extending coolant channel.

Preferably, the carrier or shank part comprises a coupling region for coupling to the rotary drive and a clamping region adjoining it along the axis of rotation in the direction of the drilling part for clamping the drilling part and the cutting part.

Preferably, the clamping region has a larger diameter than the coupling region. Alternatively, the clamping region may also have the same or a smaller diameter than the coupling region.

Preferably, the clamping region has an end face, in particular a cone-shaped, end face toward the bore part, in order to allow a countersinking region, which is preferably between 10 ° and 180 °. Preferably, the end face may also extend transversely to the axis of rotation.

Preferably, the clamping region has a first bore extending along the axis of rotation for receiving the drilling part, in particular of the drill. Preferably, the clamping region has a, in particular at least substantially slot-shaped, recess for receiving the cutting part. The recess preferably comprises a lateral recess and / or relief for guiding the cutting part.

Preferably, the drilling part at least a first drill body and a second drill body, which are each separated by a groove.

Preferably, the grooves and the drill bodies each extend helically or helically with a rake angle about the axis of rotation or also straight along the axis of rotation.

Preferably, the first bracing element comprises at least one Verspannstift, in particular at least one cylindrical pin, wherein the Verspannstift is inserted or inserted into a, in particular transversely to the axis of rotation and / or spaced from this, extending second bore in the carrier or shaft part.

Preferably, the first bracing element, in particular the at least one cylindrical pin, arranged transversely to the axis of rotation or can be arranged.

The first bracing element, in particular the at least one bracing pin, is preferably fixed or fixable by at least one first fastening element, in particular by at least one threaded pin or at least one fastening screw, wherein the first fastening element in one, in particular transversely to the axis of rotation and / or on this tapered, third bore, in particular with internal thread, inserted into the carrier or shaft part, can be inserted, screwed or screwed.

Preferably, the first fastening element is arranged transversely to the axis of rotation and on this tapered and preferably transversely to the Verspannstift or arranged.

Preferably, the first bracing element, in particular the at least one cylindrical pin, a, in particular transversely to the longitudinal direction extending first recess for engagement of the boring part. For this purpose, a first, in particular circular segment-shaped, recess for bracing the drilling part is preferably formed on the side of the first bracing element facing the first bore.

The first recess is preferably used as protection against falling out and twisting when loosening the fastener. The first recess is preferably semicircular and / or slightly smaller than the first bore, in particular as the shank of the drilling part in order to be able to adapt to the shank of the drilling part. This results in preferably a positive connection between the first bracing element and drilling part.

Preferably, the first bracing element, in particular the at least one cylindrical pin, a, in particular parallel to the longitudinal direction extending second recess for engagement, in particular for screwing, the first fastening element.

For this purpose, on the side facing away from the first bore, a second, in particular rectangular or circular, recess opposite the first recess is preferably formed for insertion of the first fastening element. This second recess also preferably secures the first bracing element against centrifugal forces even when the drilling part is not clamped and protects it from being thrown off.

When screwing in the first fastening element, in particular of the at least one threaded pin or the at least one fastening screw, the first bracing element, in particular the at least one cylinder or bracing pin, can be moved from an initial position to the drilling part, wherein it is in the first loosening of the first fastener in the Starting position springs back. For this purpose, the first bracing element preferably comprises at least one, in particular two, spring elements, for example O-rings, preferably on both sides of the first bore and / or around the at least one cylinder or bracing pin, which can preferably serve as anti-slip device and / or positioning aid.

Preferably, the first bracing element comprises at least two Verspannstifte, in particular at least two cylindrical pins, which are preferably arranged along the axis of rotation, wherein in each case a threaded pin or a fastening screw fixes a Verspannstift.

Preferably, the cutting part extends in the longitudinal direction parallel to a cutting plane. Preferably, the cutting plane of the cutting part forms a cutting angle to the axis of rotation, which is preferably at least approximately equal to the rake angle.

Preferably, the cutting part has a cutting edge. Preferably, the cutting part abuts against the drilling part.

Preferably, the cutting part is at least substantially diamond-shaped in cross-section and has a beveled surface on an end side forming the cutting edge and an, for example, cuboid guide projection. The guide projection preferably runs opposite the cutting edge and may be rectangular or round in cross section.

Preferably, the first drill body has a first back surface and / or the second drill body has a second back surface.

Preferably, the cutting part at a cutting angle of 10 ° to 30 °, preferably of 20 °, inclined to the axis of rotation in the carrier or shaft part clamped or clamped. Preferably, the cutting part bears against a back surface of the drill, in particular behind a guide bevel of the drill body, and preferably engages in a recessed surface with respect to the guide bevel.

The second bracing element preferably comprises a clamping wedge. Preferably, the second bracing element, in particular the clamping wedge, extends in a clamping direction parallel to the cutting part or in a bracing angle of 1 ° to 15 °, in particular of 5 ° to the cutting part.

Preferably, the clamping wedge is fixed or fixable by a second fastening element, in particular by a clamping screw.

Preferably, the second fastening element in the shaft part by the clamping wedge, in particular in the clamping direction, screwed or screwed, in particular by a bore in the clamping wedge, which may preferably have an internal thread.

Preferably, the second fastening element and the clamping wedge can be inserted or screwed into the clamping region from the end face.

The invention will be further elucidated on the basis of exemplary embodiments and with reference to the accompanying drawings. Therein show the

1 a schematic perspective view of a barrel system according to the invention, the

2 a first section through an inventive barrel system and the

3 a second section through an inventive barrel system.

The figures show a barrel system 1 , with a carrier or shaft part 2 for coupling to a rotary drive, in particular to a spindle, with a boring part 3 , in particular a drill, for drilling a borehole and a cutting part 4 for cutting a chamfer on or around the borehole.

The carrier or shank part 2 and the boring part 3 are rotatable by the rotary drive in a rotational direction about a rotation axis D. The drilling part 3 is over at least a first bracing element 5 . 5 ' in the carrier or shaft part 2 releasably fixed or fixable.

The cutting part 4 is over at least a second bracing element 6 in the carrier or shaft part 2 releasably fixed or fixable.

The carrier or shank part 2 includes a coupling area 21 for coupling to the rotary drive and along it along the axis of rotation D in the direction of the drilling part 3 subsequent clamping area 22 for clamping of drilling part 3 and cutting part 4 ,

The clamping area 22 has in the embodiment a larger diameter than the coupling region 21 on, but may alternatively be the same or a smaller diameter than the coupling region 21 exhibit. The clamping area 22 has frontal to the drill 3 towards a, in particular conical running, face 23 on. The clamping area 22 has a first bore extending along the axis of rotation D 20 for receiving the drilling part 3 on.

The clamping area 22 has a, in particular at least substantially slot-shaped, recess for receiving the cutting part 4 on. The recess comprises a lateral recess and / or relief for guiding the cutting part 4 ,

The drilling part 3 has at least one first drill body 35 and a second drill body 36 on, each through a groove 33 . 34 are separated from each other. The grooves 33 . 34 and the drill body 35 . 36 each run spirally or helically with a rake angle γ about the axis of rotation D or also, but not shown in the figures, just along the axis of rotation D.

The first drill body 35 has a first back surface 31 on. The second drill body 36 has a second back surface 32 on.

The first bracing element 5 . 5 ' comprises at least one Verspannstift, in particular at least one cylindrical pin 56 , wherein the Verspannstift in a, in particular transversely to the axis of rotation D and / or spaced from this, second bore 24 in the carrier or shaft part 2 inserted or inserted.

The first bracing element 5 . 5 ' , in particular the at least one cylindrical pin 56 , is arranged transversely to the axis of rotation D or can be arranged.

The first bracing element 5 . 5 ' , in particular the at least one Verspannstift, is by at least a first fastening element 51 , in particular by at least one threaded pin or at least one fastening screw, fixed or fixable.

The first fastening element 51 is in a, in particular transverse to the axis of rotation D and / or tapering to this, third bore 25 , in particular with internal thread, in the carrier or shank part 2 inserted, insertable, screwed or screwed.

The first fastening element 51 is transverse to the axis of rotation D and on this tapered and preferably transverse to the Verspannstift 56 arranged or arranged.

The first bracing element 5 . 5 ' , in particular the at least one cylindrical pin 56 , has one, in particular transversely to its longitudinal direction extending recess for engagement of the drilling part 3 on. This is at the first hole 20 facing side, a first, in particular circular segment-shaped, recess 54 for clamping the boring part 3 educated. The first recess 54 serves as protection against falling out and twisting when loosening the fastener 51 , The recess 54 is semicircular and / or slightly smaller than the first hole 20 , in particular as the shank of the drilling part 3 to attach it to the shank of the drill bit 3 to be able to adapt. This creates a positive connection between the clamping element 5 . 5 ' and drilling part 3 ,

The first bracing element 5 . 5 ' , in particular the at least one cylindrical pin 56 , Has a, in particular parallel to the longitudinal direction extending second recess 55 for engagement, in particular for screwing, the first fastener 51 on. This is at the of the first hole 20 side facing away from a second, in particular rectangular or circular, the first recess 54 opposite recess 55 for inserting the first fastening element 51 educated. The second recess 55 secures even when not clamped drilling part 3 the first tensioning element 5 . 5 ' against centrifugal forces and protects it from throwing away.

The first bracing element 5 . 5 ' , in particular the at least one cylinder or Verspannstift 56 is when screwing the first fastener 51 . 51 ' , in particular of the at least one threaded pin or the at least one fastening screw, from a starting position to the drilling part 3 pressed, it is when releasing the first fastener 51 . 51 ' , springs back to the starting position. The first bracing element 5 . 5 ' For this purpose, preferably comprises at least one, in particular two, spring elements 52 . 53 , For example, O-rings, preferably on both sides of the first bore 20 and / or the at least one cylinder or Verspannstift 56 which can preferably also serve as slip protection and / or positioning aid.

The first bracing element 5 . 5 ' comprises at least two Verspannstifte, in particular at least two cylindrical pins 56 , Which are preferably arranged along the axis of rotation D, wherein in each case a threaded pin or a fastening screw 51 a tensioning pin 56 fixed.

The cutting part 4 extends in the longitudinal direction parallel to a cutting plane S. The cutting plane S of the cutting part 4 forms a cutting angle α to the axis of rotation, which is preferably at least approximately equal to the rake angle γ.

The cutting part 4 is at least substantially rhombic in cross-section and has at one the cutting edge 41 forming end face a beveled surface 42 and a cuboid guide projection 43 on. The leadership advantage 43 runs the cutting edge 41 opposite and can be rectangular or round in cross section.

The cutting part 4 lies on the back surface 32 of the drill 3 at, in particular behind a Führungsfase the drill body 36 , and preferably engages in a recessed with respect to the Führungsfase area. The cutting part 4 is at a cutting angle α of 10 ° to 30 °, preferably 20 °, inclined to the axis of rotation D in the carrier or shank part 2 clamped or clamped to ensure a good chip flow and chip breakage.

This eliminates a chip breaker and the rake face of the cutting part 4 be formed as a flat surface. The one or more cutting parts 4 are in a groove in the clamping area 22 the carrier or shank part 2 radially displaceable. This makes it possible, different drill diameter in the same carrier or shaft part 2 to use. The positioning of the cutting part or parts 4 takes place advantageously behind the Führungsfase on the drilling part or twist drill 3 ,

As a result, on the one hand the chip removal of the drill 3 not hindered, on the other hand is the sensitive tip of the cutting part 4 not involved in machining.

The second bracing element 6 includes a clamping wedge 62 and runs in a Verspannrichtung V parallel to the cutting part 4 or in a bracing angle β of 1 ° to 15 °, in particular of 5 °, to the cutting part 4 , The clamping wedge 62 is by a second fastener, in particular by a clamping screw 61 , fixed or fixable.

The second fastening element 61 is in the shaft part 3 through the clamping wedge 62 , in particular in the clamping direction, screwed or screwed, in particular by a bore in the clamping wedge 62 , which may preferably have an internal thread, wherein the second fastening element 61 and the clamping wedge 62 from the frontal area 23 forth in the clamping area 22 can be inserted or screwed.

The cutting body 4 is thus with the help of the clamping wedge 62 whose axis is at an angle of 1 ° to 15 °, preferably 5 °, to the cutting body 4 tilted, clamped. The clamping wedge 62 is done with the help of a threaded pin 61 with right-left thread or differential thread tensioned or released. The clamping wedge 62 can be used to change the cutting part (or: cutting body) 4 in the main body (carrier or shaft part 2 ) remain. In addition to the Facilitation simplifies this acts as a captive for the Verspannelement 6 ,

The twist drill 3 is done with the help of clamping elements or bracing elements 5 . 5 ' and clamping screws 51 . 51 ' in the carrier body (carrier or shaft part 2 ). Each tensioning pin 56 . 56 ' the clamping elements 5 . 5 ' Has a recess for a clamping screw or a threaded pin 51 . 51 ' which, even with not cocked tool, the clamping element 5 . 5 ' protects against centrifugal forces and protects against throwing away.

When loosening the threaded pin 51 . 51 ' springs the tensioning element 5 . 5 ' with the help of two O-rings 52 . 53 away from the drill shank. Opposite the clamping screw 51 . 51 ' owns the clamping element 5 . 5 ' a semicircular recess, which may be slightly smaller than the spiral drill shaft and thus to the shaft of the Bohrteils 3 can adapt.

As a result, the transmittable torque is additionally increased. By this kind of tension the drill can 3 sensitive by twisting to the cutting parts 4 be positioned and adjusted axially before it is tightened. Depending on the size of the drum system, one to three drill clamping elements 5 . 5 ' , preferably two, be necessary.

The carrier or shank part 2 , which may preferably also be referred to as base body, is formed at least predominantly or also completely of steel and may have a coolant channel, not visible in the figures, extending in particular along the axis of rotation.

The carrier or shank part 2 can twist drill 3 with cylindrical shank after DIN 6535HA , in particular the size 6, 8, 10, 12, 14 and 16 mm record. The drum system can be designed for a countersink angle of 180 ° to 10 °.

The twist drill 3 can dimensions after DIN 6537 short / long.

LIST OF REFERENCE NUMBERS

D

axis of rotation

V

clamping direction

S

cutting plane

α

cutting angle

β

Verspannwinkel

γ

rake angle

1

Fassystem

2

Carrier or shaft part

20

first hole

21

coupling region

22

clamping range

23

face

24

second hole

25

third hole

3

drill

31

first back surface

32

second back surface

33, 34

groove

35

first drill body

36

second drill body

4

cutting part

41

cutting edge

42

beveled surface

43

guide projection

5, 5 '

first bracing element

51, 51 '

first fastening element

52, 53

O-ring

54

first recess

55

second recess

56

Verspannstift

57

stop surface

6

second bracing element

61

second fastening element (clamping screw)

62

clamping wedge

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102004058163 [0003]
• WO 90/04474 [0003]

Cited non-patent literature

• DIN 6535HA [0067]
• DIN 6537 [0068]

Claims (6)

Drum system ( 1 ), in particular a modular drum system, comprising a) a carrier or shank part ( 2 ) for coupling to a rotary drive, in particular to a spindle, b) a boring part ( 3 ), in particular a drill, for drilling a borehole, c) at least one cutting part ( 4 ) for cutting a chamfer on or around the borehole, d) the support or shank part ( 2 ) and the drilling part ( 3 ) are rotatable about the rotational axis (D) by the rotational drive in a rotational direction, e) the boring part ( 3 ) via at least one first bracing element ( 5 . 5 ' ) in the carrier or shank part ( 2 ) is releasably fixed or fixable, f) wherein the cutting part ( 4 ) via at least one second bracing element ( 6 ) in the carrier or shank part ( 2 ) is releasably fixed or fixable. Barrel system according to claim 1, comprising one or more of the following features: a) wherein the support or shank part ( 2 ) is formed at least predominantly or even completely of steel and / or has a, in particular along the axis of rotation extending, coolant channel, b) wherein the carrier or shaft part ( 2 ) a coupling area ( 21 ) for coupling to the rotary drive and along it along the axis of rotation (D) in the direction of the drilling part ( 3 ) subsequent clamping area ( 22 ) for clamping the drilling part ( 3 ) and cutting part ( 4 ), c) wherein the clamping area ( 22 ) has a larger diameter than the coupling region ( 21 ) or wherein the clamping area ( 22 ) has the same or a smaller diameter than the coupling region, d) wherein the clamping region ( 22 ) frontally to the drilling part ( 3 ) towards a, in particular conically extending, end face ( 23 ) in order to preferably allow a lowering range which is between 10 ° and 180 °, e) wherein the clamping area ( 22 ) frontally to the drilling part ( 3 ) has an end face extending transversely to the axis of rotation, f) wherein the clamping region ( 22 ) along the axis of rotation (D) extending first bore ( 20 ) for receiving the drilling part ( 3 ), in particular the drill, having; g) the clamping area ( 22 ), in particular at least substantially slot-shaped, recess for receiving the cutting part, wherein the recess preferably a lateral recess and / or relief grinding for guiding the cutting part ( 4 ). Barrel system according to one of the preceding claims, comprising one or more of the following features: a) wherein the boring part ( 3 ) at least one first drill body ( 35 ) and a second drill body ( 36 ), each through a groove ( 33 . 34 ) are separated from each other, b) wherein the grooves ( 33 . 34 ) and the drill body ( 35 . 36 ) preferably each spiral or helical with a rake angle (γ) about the axis of rotation (D) or just along the axis of rotation (D). Barrel system according to one of the preceding claims, comprising one or more of the following features: a) wherein the first bracing element ( 5 . 5 ' ) at least one Verspannstift, in particular at least one cylindrical pin ( 56 ), wherein the Verspannstift in a, in particular transversely to the axis of rotation (D) and / or spaced from this, second bore ( 24 ) in the carrier or shank part ( 2 ) is inserted or insertable; b) wherein the first bracing element ( 5 . 5 ' ), in particular the at least one cylindrical pin ( 56 ), is arranged transversely to the axis of rotation (D) or can be arranged; c) wherein the first bracing element ( 5 . 5 ' ), in particular the at least one tensioning pin, by at least one first fastening element ( 51 ), in particular by at least one threaded pin or at least one fastening screw, is fixed or can be fixed, wherein the first fastening element ( 51 ) in a, in particular transversely to the axis of rotation (D) and / or on this tapered, third bore ( 25 ), in particular with internal thread, in the carrier or shank part ( 2 ) inserted, inserted, screwed or screwed; d) wherein the first fastening element ( 51 ) transverse to the axis of rotation (D) and tapering towards this and preferably transversely to the Verspannstift ( 56 ) is arranged or can be arranged; e1) wherein the first bracing element ( 5 . 5 ' ), in particular the at least one cylindrical pin ( 56 ), in particular transversely to the longitudinal direction extending first recess ( 54 ) for engagement of the boring part, e2) wherein on the side facing the first bore side of the bracing element ( 5 . 5 ' ) a first, in particular circular segment-shaped, recess ( 54 ) for bracing the boring part ( 3 ), e3) wherein the first recess ( 54 ) is semicircular and / or slightly smaller than the first bore, in particular as the shank of the Bohrteils ( 3 ), in order thereby to the shaft of the Bohrteils ( 3 ), e4) the first recess (e) 54 ) a positive connection between the clamping element and drilling part ( 3 ), f1) wherein the first bracing element ( 5 . 5 ' ), in particular the at least one cylindrical pin ( 56 ), in particular parallel to the longitudinal direction extending second recess ( 55 ) for engagement, in particular for screwing, the first fastener ( 51 f2), wherein preferably at the side facing away from the first bore side of the first bracing element ( 5 . 5 ' ) a second, in particular rectangular or circular, of the first recess ( 54 ) opposite recess ( 55 ) with a stop surface ( 57 ) for inserting the first fastening element ( 51 g), wherein the first bracing element ( 5 . 5 ' ), in particular the at least one cylinder or Verspannstift ( 56 ) when screwing the first fastener ( 51 . 51 ' ), in particular of the at least one threaded pin or the at least one fastening screw, from an initial position to the drilling part ( 3 ), wherein upon release of the first fastening element ( 51 . 51 ' ), springs back to the starting position, h) wherein the first bracing element ( 5 . 5 ' ) preferably at least one, in particular two, spring elements ( 52 . 53 ), for example, comprises O-rings, preferably on both sides of the first bore and / or around the at least one cylinder or Verspannstift ( 56 ), which can preferably also serve as anti-slip device and / or positioning aid, i) wherein preferably the first bracing element ( 5 . 5 ' ) at least two Verspannstifte, in particular at least two cylindrical pins ( 56 ), which are preferably arranged along the axis of rotation (D), wherein in each case a threaded pin or a fastening screw ( 51 ) a clamping pin ( 56 ) fixed. Barrel system according to one of the preceding claims, comprising one or more of the following features: a) wherein the cutting part ( 4 ) extends in the longitudinal direction parallel to a cutting plane (S), b) wherein the cutting plane (S) of the cutting part (S) 4 ) forms a cutting angle (α) to the axis of rotation, which is preferably at least approximately equal to the rake angle (γ); c) wherein the cutting part ( 4 ) a cutting edge ( 41 ) having; d) wherein the cutting part ( 4 ) is at least substantially diamond-shaped in cross section and at one of the cutting edge ( 41 ) forming a beveled surface ( 42 ) and an example, rectangular guide projection ( 43 ), wherein the guide projection ( 43 ) preferably the cutting edge ( 41 ) and / or is rectangular or round in cross-section, e) wherein the cutting part ( 4 ) on the drill ( 3 ) is present; f) wherein the cutting part ( 4 ) at a cutting angle (α) of 10 ° to 30 °, preferably of 20 °, to the axis of rotation (D) inclined in the carrier or shank part ( 2 ) is clamped or clamped, g) wherein the cutting part ( 4 ) on a back surface ( 32 ) of the drill ( 3 ), in particular behind a guide land of a drill body ( 36 ), and preferably engages in a recessed relative to the guide bevel surface. Barrel system according to one of the preceding claims, comprising one or more of the following features: a) wherein the second bracing element ( 6 ) a clamping wedge ( 62 ); b) wherein the second bracing element ( 6 ), in particular the clamping wedge ( 62 ), in a clamping direction (V) parallel to the cutting part ( 4 ) or in a bracing angle (β) of 1 ° to 15 °, in particular of 5 ° to the cutting part ( 4 ), c) wherein the clamping wedge ( 62 ) by a second fastening element, in particular by a clamping screw ( 61 ), fixed or fixable, d) wherein the second fastening element ( 61 ) in the shaft part by the clamping wedge ( 62 ), in particular in the clamping direction (V), screwed or screwed, in particular by a bore in the clamping wedge with an internal thread, e) wherein the second fastening element ( 61 ) and the clamping wedge ( 62 ) from the end face ( 23 ) ago in the clamping area ( 22 ) can be inserted or screwed.

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