Hole Making Options

The options listed below are available for all drilling operations, except center drilling and Deep Bore Machine operations:

• Requested Tool Diameter: diameter of the selected tool. This value is used (along with speed, feed, hole length, and other factors) to determine cut time.

Select one of the following options:

o Use Computed Tool Diameter: aPriori typically chooses a tool diameter based on GCD diameter. See Tool Selection for more information.

o Override Tool Diameter: enter the tool diameter in millimeters.

• Requested Feed Per Rev: distance the tool travels through the part per revolution of the tool. This value is used (along with speed, tool diameter, hole length, and other factors) to determine tool axis speed and cut time. See Operation Cycle Time and Cut Time Calculations for more information on how feed contributes to cutting time.

Select one of the following options:

o Use Computed Feed Per Rev: aPriori determines this value by interpolation from data tables based on tool series, tool diameter, and material cut code—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 drillFeedAdjustment. The adjusted value is used to help determine tool axis speed and cut time.

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 drillFeedAdjustment. The adjusted value is used to help determine tool axis speed and cut time.

• Requested Tool Cutting Speed: how fast the tool turns in unit distance per unit time; that is, the speed at which a point on the outer edge of the tool moves along the circular path around the center of the tool. This value is used to help determine tool axis speed and cut time. See Operation Cycle Time and Cut Time Calculations for more information on how speed contributes to cutting time.

Select one of the following options:

o Use Computed Tool Cutting Speed: aPriori determines this value by interpolation from data tables based on tool series, tool diameter, and material cut code--see Tool Selection. This value is adjusted to compensate for various factors, including machine speed and power limitations. The value is also adjusted by multiplying by the cost model variable drillSpeedAdjustment. The adjusted value is used to help determine tool axis speed and cut time.

o Override Tool Cutting Speed: enter a speed in meters per minute. This value is adjusted to compensate for various factors, including machine speed and power limitations. The value is also adjusted by multiplying by the cost model variable drillSpeedAdjustment. The adjusted value is used to help determine tool axis speed and cut time.

Pecking supports the following additional options:

• Peck Depth: depth of a single peck. Amount of Hole to be Pecked (see below) divided by Peck Depth is the number of pecks to be performed. Select one of the following options:

o Use Default: this is the value of the cost model variable lengthOfPeck.

o Override: specify a value in millimeters.

• Amount of Hole to be Pecked: depth achieved by all the pecks to be performed. This value divided by Peck Depth (see above) is the number of pecks to be performed. Select one of the following options:

o Use Computed Value: length of the GCD (or, if the GCD is part of a multistep hole, length of the multistep hole). (Note that, for holes that are part of a multistep hole, Pecking is always preceded by Center Drilling, which requires that that the GCD is the smallest hole of the multistep hole.)

o Override: specify a value in millimeters.

The Boring Enlargement operation sequence (Rough Boring followed by Semi-Finish Boring) supports the following additional options:

• Number of Rough Boring Passes: By default, aPriori determines the number of rough boring passes based on the following factors:

o Hole radius: This is the depth of material (measured from the center outwards) that must be removed in order to create the hole.

o Depth of the initial drilling pass: this is the depth of material removed by the Drilling operation, that is, half the diameter of the Drilling tool. In starting point VPEs, the drill diameter for this initial operation of the sequence is 70% of the hole diameter (or the maximum available drill size, whichever is smaller). VPE administrators can customize this percentage with the cost model variable enlargementDrillAsFractOfHole.

o Number of semi-finishing passes (see above)

o Depth of a single semi-finishing pass: This is either 7.2mm or half the depth not removed by initial drilling and finishing, whichever is less.

o Whether a finishing pass is required and, if so, its depth (that is, the depth of material removed by the hole finishing operation). If a finishing pass is required, this is assumed to be 0.3% of the hole radius, provided this value falls between 0.0508mm (0.002 inches) and 0.127 (0.005 inches).

o Depth of a single, typical rough boring pass. This is assumed to be 7.5mm.

aPriori uses this information to determine the depth of material that must be removed by rough boring in order that the total depth of material removed by all operations adds up to the hole radius. The required number of passes is the depth that must be removed by rough boring divided by the depth of a single typical rough boring pass, rounded up to the nearest whole number of passes.

You can override the default on a GCD-by-GCD basis with this setup option; specify a value greater than or equal to 1.

• Num Semi Finish Boring Passes: In starting point VPEs, the default, the number of semi-finishing passes is 2. You can customize the default with the cost model variable defaultNumSemiFinishBoringPasses. You can override the default on a GCD-by-GCD basis with this setup option; specify a value greater than or equal to 1.