Haas Lathe Classic Controls: Entering Offsets 265

C axis

A rotational axis that controls the rotation of the spindle for precise positioning of the workpiece. A C axis is often required to effectively use live tooling.

CANCEL

A key on the Haas control that backspaces the cursor to delete the last character entered, and cancels any program block that is highlighted during a block edit.

CHC

Classic Haas Control. A popular model of the Haas Automation®, Inc. CNC control. There have been several versions of the CHC since it was first released in 1988.

Classic Haas Control

A popular model of the Haas Automation®, Inc. CNC control. There have been several versions of the CHC since it was first released in 1988.

cutter compensation

The use of G codes and radius offsets to compensate for the rounded tips of cutting inserts. If cutter compensation is used, the programmer creates a toolpath that follows the exact features of the part.

deflection

A deviation from a straight line or plane when a force is applied. Deflection increases as the length of a workpiece increases.

G41

A G code used with tool nose radius compensation to shift a turning tool left of the direction of tool travel.

G42

A G code used with tool nose radius compensation to shift a turning tool right of the direction of tool travel.

HANDLE JOG

An operation mode key that allows for the manual operation of tool movement via the handwheel or jog buttons.

HOME

A cursor key that moves a program quickly to its beginning or to the top of most displays.

homing

The process of sending the lathe's turret to its machine zero position.

inner diameter

ID. An interior surface of a workpiece feature or hole.

input buffer

A temporary location on a computer that holds all incoming information before it continues to the control for processing.

job sheet

A document that includes all manufacturing specifications for a lot of parts.

jog handle

A dial that is turned by hand in order to manually control CNC machine motions along the axes. The jog handle "clicks" in controlled, measured increments that an operator selects on the keypad.

lot

The number of consecutive parts manufactured between tool wear offset changes.

machine zero

The position located at the farthest possible distance in a positive direction along the machine axes. This position is permanently set for each particular CNC machine.

OD

Outer diameter. The exterior surface of a cylindrical or spherical workpiece.

offset

A numerical value stored in the CNC control that repositions machine components. Offsets are used to adjust for differences in tool geometry, part size, tool wear, etc.

OFSET

The display key on the Haas control that shows the various programmed offsets.

outer diameter

The exterior surface of a cylindrical or spherical workpiece.

PAGE DOWN

A cursor key that cycles quickly through items in CHC menu. The PAGE DOWN key navigates to the next offsets menu when the highlight cursor reaches the bottom of the current menu.

PAGE UP

A cursor key that cycles quickly through items in CHC menu. The PAGE UP key navigates to the previous offsets menu when the highlight cursor reaches the top of the current menu.

program zero

The position that acts as the origin for the part program of a particular workpiece. This position is unique to each workpiece design, and it is selected by the part programmer.

programmable tailstock

A tailstock opposite the spindle that can be programmed to travel toward and away from the workpiece.

radius offset

An offset used on the lathe that slightly adjusts the tool to compensate for the rounded tip of an insert during contouring, chamfering, and other multi-axis operations.

STOP

An override key on the Haas control that stops the spindle.

stylus

The precision tip on the tool presetter that electronically records the turret position once a tool tip contacts its surface.

sub spindle

A secondary spindle opposite the main spindle that can be programmed to clamp a workpiece on its exposed end for additional machining on its back side.

taper offset

An offset used on the lathe that compensates for workpiece deflection. Each inch along the workpiece increases the compensation amount.

tip offset

An offset used on the lathe that indicates one of nine possible orientations for a particular tool. Tip offsets are used in conjunction with radius offsets.

TNRC

Tool Nose Radius Compensation. The use of G codes with radius and tip offsets to compensate for the rounded tips of cutting inserts. If TNRC is used for a tool in a part program, the operator must enter a radius and tip offset for that tool.

tolerance

An unwanted but acceptable deviation from a given dimension. Tolerances indicate the allowable difference between a physical feature and its intended design.

tool geometry offset

An offset used on the lathe that accounts for variations in tool length along the X and Z axis. Each tool loaded in the turret requires its own geometry offset.

tool nose radius compensation

TNRC. The use of G codes with radius and tip offsets to compensate for the rounded tips of cutting inserts. If tool nose radius compensation is used for a tool in a part program, the operator must enter a radius and tip offset for that tool.

tool presetter

A device on the lathe used to quickly determine tool geometry offsets on the X axis and Z axis. The tool tip contacts surfaces on the probe, which instantly records the turret position in the offset screen.

tool turret

A lathe component that holds a number of cutting tools. The tool turret rotates to place tools in the cutting position.

wear offset

An offset used on the lathe that slightly adjusts tool location to account for wear, deflection, and other variables that arise during machining.

work offset

An offset used to adjust the location of every tool loaded in the turret. On the lathe, the work offset changes the position of the turret in both the X axis and Z axis.

WRITE/ENTER

A key on the Haas control that acts as a general enter key.

X DIA MESUR

A key on the Haas lathe that automatically stores the X axis position as a tool geometry offset for a tool that is properly touched off the workpiece surface. X DIA MESUR prompts the operator for a diameter measurement.

Z FACE MESUR

A key on the Haas lathe that automatically stores the Z axis position as a tool geometry offset for a tool that is properly touched off the workpiece surface.