Turret-Press-specific Inputs

Turret Press provides process-level setup options for specifying the total number of hits performed by the nibble, punch, and tapping operations. The Perforating operation provides setup options for specifying the total number of cluster and individual hits. There are also GCD-level setup options for controlling the number of hits performed to create a given feature.

Process-level Options

Turret Press provides the following process-level options :

• Total Number of Punch Hits: this is the number of total number of hits performed by the following operations:

o Punching

o Perforating

o Countersinking

o Lancing

o Forming

By default, this is the sum of the total number of hits performed by each of these operations (see Operation-level Options and GCD-level Options). Enter a value to override the default.

• Total Number of Nibble Hits: this is the total number of hits performed by the Nibble operation. By default, this is the sum of the nibble hits required for each GCD that is created by Nibbling (see GCD-level Options). Enter a value to override the default.

• Total Number of Tap Hits: this is the total number of hits performed by the Tapping operation. By default, this is the sum of the tap hits required for each GCD on which Tapping is performed (see GCD-level Options). Enter a value to override the default.

Operation-level Options

The operation Perforating (performed on the Component GCD) provides the following setup options:

• Cluster Hits: this is the total number of cluster hits used to create the holes that are handled by the Perforating operation. A hole is handled by this operation if there are sufficiently many holes with the same size and shape, and sufficiently many nearby such holes (see Operation-level Feasibility and Routing). By default, the total number of cluster hits is the sum of the number of cluster hits required for each unique size-shape combination.

The number of cluster hits required to make all the holes of a given size and shape is the number required using the largest punch (from among 2X2-8X8 tools) that can make the holes using 2 or more cluster hits (together with 0 or more individual hits for “remainder” holes—see the option Individual Hits, below), under the assumption that the holes are arranged so as to allow optimal use of each punch.

In other words, the default number of cluster hits for a group of same-size/shape holes is the integer value of the result of dividing the number of holes in the group by the number of pins in the punch, using the largest punch for which this quotient is 2 or greater.

Enter a value for this option in order to override the default.

• Individual Hits: this is the total number of individual or “remainder” hits used to create the holes that are handled by the Perforating operation. A hole is handled by this operation if there are sufficiently many holes with the same size and shape, and sufficiently many nearby such holes (see Operation-level Feasibility and Routing). By default, the total number of individual hits is the sum of the number of individual hits required for each unique size-shape combination.

The number of individual hits required to make all the holes of a given size and shape is the number required using the largest punch (from among 2X2-8X8 tools) that can make the holes using 2 or more cluster hits (plus 0 or more individual hits), under the assumption that the holes are arranged so as to allow optimal use of each punch.

In other words, the default number of individual hits for a group of same-size/shape holes is the remainder of the result of dividing the number of holes in the group by the number of pins in the punch, using the largest punch for which this quotient is 2 or greater.

Enter a value for this option in order to override the default.

GCD-level Options

There are also setup options for controlling the number of hits performed to create a given GCD. The GCD-level options are provided for GCDs created by the following operations:

• Punching

• Nibbling

• Countersinking

• Flanging

• Forming

• Lancing

• Perforating

• Tapping

For all these operations except Punching and Nibbling, the default number of hits is 1.

For Punching a SimpleHole or a curved Edgeof a Blank or ComplexHole, the default number of hits is 1. For Punching a straight Edge of a Blank or ComplexHole, the default number of hits depends on the following:

• Length of the Edge

• Maximum tool overlap, specified by the machine property Max Tool Overlap

• Candidate tool sizes, specified by the machine properties Straight Length, 1 through Straight Length, 5

aPriori chooses the largest tool that will create the edge without excess overlap. The default number of hits is the edge length divided by the tool length, rounded up to the nearest integer:

Number of Punching Hits = roundup (Edge Length / Punching Tool Length)

For Nibbling a SimpleHole or the curved Edge of a Blank or ComplexHole, the default number of hits depends on the following:

• Circumference of the hole or length of the edge

• Nibble tool overlap. This is the fraction of the nibble tool diameter that should overlap the previously nibbled portion, specified by the machine property Nibble Tool Overlap.

• Nibble tool diameter (specified by the machine property Nibble Tool Diameter)

So the default number of hits is given bythe following:

Number of Nibbling Hits = roundup (Hole Circumference or Edge Length /

(Nibble Tool Diameter – (Nibble Tool Overlap * Nibble Tool Diameter)))

Enter a value to override the default.