External Turning Tool Holder Screw Clamp



  • Manufactured from High Tensile Steel to provide better yield strength under heavy working conditions.
  • Used for various external cutting operations on the lathe.
  • The screw holds the positive type insert rigidly in place for stablility during operations and provides free chip flow.
  • The inserts can be easily and rapidly replaced once worn down thus saving machining time and cost.
  • Rust preventive black oxide finish.
  • Inserts can be provided on request.
External Turning Tool Holder Screw Clamp
External Turning Tool Holder Screw Clamp

Application

External turning tool holders are used for material removal from the outer surface of the workpiece through operations like longitudinal turning, facing or a combination of both in order to obtain the required length, diametre and contour.

  • Turning: The operation in which the tool moves along the axis of the workpiece in order to reduce its diametre to the required size.
  • Facing: The operation in which the tool moves into the workpiece or in a direction perpendicular to the axis of the workpiece.

The turning tool holders are available in a number of shapes and sizes each having their distinguish entering/lead angle, seat inclination angle and clamp styles. 

Nomenclature

Cutting Geometry

 

  • Entering Angle: The angle between the cutting edge and the direction of the feed.
  • Lead Angle: The angle made by the plane of the workpiece with the cutting edge of the tool.
  • End Cutting Edge Angle: The angle between the end cutting edge and the feed direction.
  • Insert Rake Angle: The angle between the cutting edge when viewed from the side and the axis of the insert’s seat.
  • Inclination Angle: The angle of the axis of the insert’s seat with respect to the horizontal axis.
  • Effective Rake Angle: Combination of the Insert rake angle and the inclination angle, formed between the cutting edge and the horizontal axis.
  • Clearance Angle / Side Relief: The inclination of the insert with respect to the vertical axis.

Effects of cutting geometry

Nose Radius

The angle formed between the main and the auxiliary cutting edge of the insert is called the nose radius. The larger the angle, higher is the cutting edge strength of the insert. Thus a higher nose radius is preffered for roughing operations. However, large nose radius also gives rise to higher distribution of cutting forces, both axially and radially, therefore increasing the power consumption as well as the vibration tendencies. Inserts with smaller nose angles are prefered for finishing, profiling or for turning intricate contours inaccessible to larger radii.

 

Holder shapes

Different holders are available for different entering angles and insert clearances. 

Rigid and lever clamping methods facilitate mounting of negative inserts (N) or inserts with 0° clearance angle, whereas screw clamping methods facilitates the clamping of N type inserts as well as inserts with some positive clearance angle.

Positive inserts consume lower power for material removal and exert lower forces. As the clearance angle increases, the strength of the cutting edge decreases. Negative inserts on the other hand provides higher edge strength but consume more power and exert higher cutting forces.

Type Size

Dimension

(mm)

Carbide Insert

Action

H L
APPROACH ANGLE 107.5°

SVQCR/L

SVQBR/L

2020 K11 20 125

VCXX 1103XX

2020 K16 20 125

VCXX 1604XX

2525 M16 25 150
3232 P16 32 170
APPROACH ANGLE 93°

SVJCR/L

​SVJBR/L

1616 H11 16 100

VCXX 1103XX

2020 K11 25 125
2525 M16 25 150

VCXX 1604XX

2525 M16 25 150
3232 P16 32 170
APPROACH ANGLE 72.5°

SVVBN

1616 H11 16 100

VCXX 1103XX

2020 K11 20 125

2020 K16 20 125

VCXX 1604XX

2525 M16 25 150

APPROACH ANGLE 95°

SCLCR/L

2020 K06 20 125

CCXX 0602XX

2525 M06 25 150
2020 K09 20 125

CCXX 09T3XX

2525 M09 25 150
APPROACH ANGLE 75°

SCKCR/L

2020 K09 20 125

CCXX 09T3XX

​​

2525 M09 25 150
APPROACH ANGLE 91°

STFCR/L

2020 K16 20 125

TCXX 16T3XX

​​

2525 M16 25 150
3232 P16 32 170
 

SRACR/L

2020 K10 20 125

RC1003

2525 M10 25 150
APPROACH ANGLE 93°

SRDCN

2020 K10 20 125

RCX T 10 T3

​​

2525 M10 25 150
2020 K12 20 125

RCX T 1204

2525 M12 25 150
APPROACH ANGLE 107.5°

SRGCR

2020 K10 20 125

RCX T 10 T3

​​

2525 M10 25 150
2020 K12 20 125

RCX T 1204

2525 M12 25 150
APPROACH ANGLE 93°

SDJCR/L

2020 K07 20 125

DCMX 0702​

2020 K11 20 125

DCMX 11 T3

2525 M11 25 150
APPROACH ANGLE 62.5°

SDNCN

1212 F07 12 80

DCMX 0702

1616 H11 16 100

DCMX 11 T3

2020 K11 20 125
2525 M11 25 150
APPROACH ANGLE 107.5°

SDQCR/L

1212 F07 12 80

DCMX 0702

1616 H11 16 100

DCMX 11 T3

2020 K11 20 125
2525 M11 25 150