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    Assignment-4 Study of Centre Lathe and Single Point Cutting Tool Geometry

    Uploaded by

    Tanmay Warde
    This document discusses the geometry of single point cutting tools used on center lathes. It defines six key angles that describe the tool's geometry: back rake angle, side rake angle, end relief angle, side relief angle, end cutting edge angle, and side cutting edge angle. These angles are used to remove chips efficiently and prevent the tool from rubbing against the workpiece. The document also explains tool signature, which is a standardized system to specify the angles of a tool using an abbreviated format.

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    Assignment-4 Study of Centre Lathe and Single Point Cutting Tool Geometry

    Uploaded by

    Tanmay Warde
    36 views4 pages
    This document discusses the geometry of single point cutting tools used on center lathes. It defines six key angles that describe the tool's geometry: back rake angle, side rake angle, end relief angle, side relief angle, end cutting edge angle, and side cutting edge angle. These angles are used to remove chips efficiently and prevent the tool from rubbing against the workpiece. The document also explains tool signature, which is a standardized system to specify the angles of a tool using an abbreviated format.

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    Workshop Assignment-4.docx

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    This document discusses the geometry of single point cutting tools used on center lathes. It defines six key angles that describe the tool's geometry: back rake angle, side rake angle, end relief angle, side relief angle, end cutting edge angle, and side cutting edge angle. These angles are used to remove chips efficiently and prevent the tool from rubbing against the workpiece. The document also explains tool signature, which is a standardized system to specify the angles of a tool using an abbreviated format.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    36 views4 pages

    Assignment-4 Study of Centre Lathe and Single Point Cutting Tool Geometry

    Uploaded by

    Tanmay Warde
    This document discusses the geometry of single point cutting tools used on center lathes. It defines six key angles that describe the tool's geometry: back rake angle, side rake angle, end relief angle, side relief angle, end cutting edge angle, and side cutting edge angle. These angles are used to remove chips efficiently and prevent the tool from rubbing against the workpiece. The document also explains tool signature, which is a standardized system to specify the angles of a tool using an abbreviated format.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 4

    Assignment-4

    Study of centre lathe and single point cutting tool geometry

    Note: The Description & Schematic Diagram of Centre Lathe is expected from
    students

    Single Point Cutting Tool Geometry:


    The elements of tool signature or nomenclature of single point cutting tool is illustrated
    in the figure below

    (i) Back rake angle:


    Back rake angle is the angle between the face of the single point cutting tool and a line
    parallel with base of the tool measured in a perpendicular plane through the side cutting
    edge. If the slope face is downward toward the nose, it is negative back rake angle and
    if it is upward toward nose, it is positive back rake angle. Back rake angle helps in
    removing the chips away from the workpiece.

    (ii) Side rake angle:


    Side rake angle is the angle by which the face of tool is inclined side ways. Side rake
    angle is the angle between the surface the flank immediately below the point and the
    line down from the point perpendicular to the base. Side rake angle of cutting tool
    determines the thickness of the tool behind the cutting edge. It is provided on tool to
    provide clearance between workpiece and tool so as to prevent the rubbing of
    workpiece with end flake of tool.
    Fig. Schematic illustration of single point cutting tool

    (iii) End relief angle:


    end relief angle is defined as the angle between the portion of the end flank
    immediately below the cutting edge and a line perpendicular to the base of the tool,
    measured at right angles to the flank. End relief angle allows the tool to cut without
    rubbing on the workpiece.

    (iv) Side relief angle:


    Side rake angle is the angle between the portion of the side flank immediately below the
    side edge and a line perpendicular to the base of the tool measured at right angles to the
    side. Side relief angle is the angle that prevents the interference as the tool enters the
    material. It is incorporated on the tool to provide relief between its flank and the
    workpiece surface.

    (v) End cutting edge angle:


    End cutting edge angle is the angle between the end cutting edge and a line
    perpendicular to the shank of the tool. It provides clearance between tool cutting edge
    and workpiece.
    (vi) Side cutting edge angle:
    Side cutting edge angle is the angle between straight cutting edge on the side of tool
    and the side of the shank. It is responsible for turning the chip away from the finished
    surface.

    Tool Signature of Single Point Cutting Tool:


    Convenient way to specify tool angles by use of a standardized abbreviated system is
    known as tool signature. It indicates the angles that a tool utilizes during the cut. It
    specifies the active angles of the tool normal to the cutting edge. This will always be
    true as long as the tool shank is mounted at right angles to the workpiece axis.

    Fig. Elements of tool signature

    The seven elements that comprise the signature of a single point cutting tool are always
    stated in the following order:

    Back rake angle (0°)


    Side rake angle (7°)
    End relief angle (6°)
    Side relief angle (8°)
    End cutting edge angle (15°)
    Side cutting edge angle (16°) and
    Nose radius (0.8 mm)

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