Finish Turning Options

Finish Turning and Back Finish Turning provide the following options:

• Number of Finishing Passes: number of times the tool passes over the GCD surface. Chipmaking time increases as the number of passes goes up--see Chipmaking Time for Finish Turning Operations.

Select one of the following options:

o Computed Number of Finishing Passes: aPriori determines this based on the required tolerance and the lookup table tblGtolProcessCapabilities. This typically defaults to 1 in aPriori starting point VPEs.

o Override Number of Finishing Passes: enter a value greater than or equal to 1.

• Requested Feed Per Rev: distance the tool travels along the part per revolution of the workpiece. This value is used to help determine area removal rate—see Chipmaking Time for Finish Turning Operations.

Select one of the following options:

o Use Computed Feed Per Rev: aPriori determines this value by interpolation from data tables—see Tool Selection. This value is adjusted to compensate for various factors, including required tolerance. Tool feed is also adjusted by multiplying by the cost model variable turningFeedAdjustment. The adjusted value is used to help determine area removal rate.

o Override Feed Per Rev: enter a value in millimeters. This value is adjusted to compensate for various factors, including required tolerance. Tool feed is also adjusted by multiplying by the cost model variable turningFeedAdjustment. The adjusted value is used to help determine area removal rate.

• Requested Tool Cutting Speed: how fast the workpiece turns in unit distance per unit time; that is, the speed at which a point on the outer edge of the workpiece moves along the circular path around the turning axis. This value is used to help determine area removal rate. See Chipmaking Time for Finish Turning Operations.

Select one of the following options:

o Use Recommended Tool Cutting Speed: aPriori determines this value by interpolation from data tables--see Tool Selection. This value is adjusted to compensate for various factors, including machine spindle speed limitations and stock hardness. The value is also adjusted by multiplying by the cost model variable turningSpeedAdjustment. The adjusted value is used to help determine area removal rate.

o Override Tool Cutting Speed: enter a speed in meters per minute. This value is adjusted to compensate for various factors, including machine spindle speed limitations and stock hardness. The value is also adjusted by multiplying by the cost model variable turningSpeedAdjustment. The adjusted value is used to help determine area removal rate.