Method and apparatus for locating and machining an idle bypass hole in a carburetor body

The method of locating and cutting an idle bypass hole in a carburetor body having a venturi section and a throttle section on a longitudinal axis and a normally closed pivotal throttle plate within the throttle section, comprising:

• adjustably mounting a carrier upon a fixture base for guided longitudinal movements thereon;
• locating and clamping a carburetor body upon the carrier with its axis parallel to the direction of movement of the carrier;
• mounting a stationary contact finger upon said base extending towards said carrier and inclined at an acute angle to said axis;
• advancing said carburetor body with said throttle section progressively receiving said contact finger until said contact finger is in firm engagement with said throttle plate adjacent its periphery on one side hereof;
• clamping the carrier upon the base;
• fixedly mounting a power laser cutting unit having a bushing and focused laser beam on a cutting axis at right angles to said longitudinal axis and at a predetermined center distance to a fixed axis of reference parallel to said cutting axis and relative to the mounting of said contact finger;
• said cutting axis being arranged at a preset critical distance from the closed throttle plate at the diametrically opposite side of its periphery;
• and
• successively cutting an idle bypass hole through said carburetor body into said throttle section upstream of said throttle plate.

Apparatus for locating and drilling the idle bypass hole in a carburetor body having a venturi section and a throttle section on a longitudinal axis and a normally closed pivotal throttle plate within the throttle section comprising:

• a fixture base;
• a carrier guidably mounted upon the base for reciprocal longitudinal movement thereon;
• said carrier adapted to receive and have clamped thereon a carburetor body with its axis parallel to the direction of movement of the carrier;
• a fixed support secured to said base and spaced from said carrier;
• an elongated control rod at one end journaled and supported upon said support and having a longitudinal axis parallel to and laterally displaced from said body axis;
• a contact finger mounted upon and projecting angularly forward of said rod at its other end;
• means for moving said carrier and carburetor body to axially receive said contact finger until it is in firm contact with said throttle plate adjacent its periphery;
• means clamping said carrier upon said fixture base;
• and a power laser cutting unit having a bushing and a focused laser beam on a cutting axis at right angles to said body axis, at a predetermined center distance to a fixed axis of reference parallel to the cutting axis and relative to the mounting of said contact finger;
• said cutting axis being arranged at a preset critical distance from the closed throttle plate for successively cutting an idle bypass hole through the carburetor body into the throttle section upstream of said throttle plate.

Apparatus for locating and cutting the idle bypass hole in a carburetor body having a venturi section and a throttle section on a longitudinal axis and a normally closed pivotal throttle plate within the throttle section comprising:

• a fixture base;
• a carrier guidably mounted upon the base for reciprocal movements thereon;
• said carrier adapted to receive and have clamped thereon a carburetor body with its axis parallel to the direction of movement of the carrier;
• a fixed support secured upon said base spaced from said carrier;
• an elongated front mounted contact finger journaled and adjustably secured upon said support and having a longitudinal axis inclined downwardly toward said carrier at an acute angle to said body axis;
• means for moving said carrier and carburetor body to receive said contact finger until it is in firm engagement with said throttle plate adjacent its periphery;
• means clamping said carrier to said fixture base;
• and a power laser cutting unit having a bushing and a focused laser beam arranged upon a cutting axis at right angles to said body axis and at a predetermined center distance to a fixed axis of reference parallel to said cutting axis and relative to the mounting of said contact finger;
• said cutting axis being arranged at a preset critical distance from the closed throttle plate, where it engages the throttle section for successively cutting an idle bypass hole through said carburetor body into the throttle section upstream of said throttle plate.

The method of locating and forming an idle bypass slot in a carburetor body having a venturi section and a throttle section on a longitudinal axis and a normally closed pivotal throttle plate within the throttle section, comprising:

• adjustably mounting a carrier upon a fixture base for guided longitudinal movements thereon;
• locating and clamping a carburetor body upon the carrier with its axis parallel to the direction of movement of the carrier;
• mounting a stationary contact finger upon said base extending toward said carrier;
• advancing said carburetor body with said venturi section and throttle section progressively receiving said contact finger until it is in firm engagement with said throttle plate adjacent its periphery;
• clamping the carrier upon the base;
• fixedly mounting a laser beam assembly having a beam axis at right angles to said longitudinal axis and at a predetermined center distance to a fixed axis of reference parallel to the beam axis relative to the mounting of said contact finger;
• said beam axis being arranged at a preset critical distance from the closed throttle plate where it engages the throttle section;
• and
• successively cutting an idle bypass slot through said carburetor body into said throttle section with the leading edge of said slot downstream of said throttle plate and portions of said slot upstream thereof.

The method of locating and forming an idle bypass slot in a carburetor body having a venturi section and a throttle section on a longitudinal axis and a normally closed pivotal throttle plate within the throttle section, comprising;

• adjustably mounting a carrier upon a fixture base for guided longitudinal movements thereon;
• locating and clamping a carburetor body upon the carrier with its axis parallel to the direction of movement of the carrier;
• mounting a stationary contact finger upon said base extending towards said carrier and inclined at an acute angle to said axis;
• advancing said carburetor body with said throttle section progressively receiving said contact finger until said contact finger is in firm engagement with said throttle plate adjacent its periphery on one side thereof;
• clamping the carrier upon the base;
• fixedly mounting a laser beam assembly having a beam axis at right angles to said longitudinal axis and at a predetermined center distance to a fixed axis of reference parallel to said beam axis and relative to the mounting of said contact finger;
• said beam axis being arranged at a preset critical distance from the closed throttle plate at the diametrically opposite side of its periphery;
• and
• successively cutting an idle bypass slot through said carburetor body into said throttle section with the leading edge of the slot downstream of said throttle plate and portions of said slot upstream thereof.

Apparatus for locating and forming an idle bypass slot in a carburetor body having a venturi section and a throttle section on a longitudinal axis and a normally closed pivotal throttle plate within the throttle section comprising;

• a fixture base;
• a carrier guidably mounted upon the base for reciprocal longitudinal movement thereon;
• said carrier adapted to receive and have clamped thereon a carburetor body with its axis parallel to the direction of movement of the carrier;
• a fixed support secured to said base and spaced from said carrier;
• an elongated control rod at one end journaled and supported upon said support and having a longitudinal axis parallel to and laterally displaced from said body axis;
• a contact finger mounted upon and projecting forward of said rod at its other end;
• means for moving said carrier and carburetor body to axially receive said contact finger until it is in firm contact with said throttle plate adjacent its periphery;
• means clamping said carrier upon said fixture base;
• and a laser beam assembly having a beam axis at right angles to said body axis, at a predetermined center distance to a fixed axis of reference parallel to the beam axis and relative to the mounting of said control rod;
• said beam axis being arranged at a preset critical distance from the closed throttle plate for successively cutting an idle bypass slot through the carburetor body into the throttle section with its leading edge downstream of said throttle plate.