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Chapter 7

UM10349_PCNC1100_Manual_0916A

Programming

Rotaonal Axis

The A-axis is a rotaonal axis. In general, the axis of rotaon can be collinear to a primary linear axis,

or arbitrary. In usual pracce, the axis of rotaon of the A-axis is typically collinear to the X-axis.

Posion is measured in degrees. It is treated as a wrapped linear axis, meaning that the angular

posion increases without limit (goes toward plus innity) as the axis turns counterclockwise and

decreases without limit (goes toward minus innity) as the axis turns clockwise. The direcon of

posive rotaon is counterclockwise when viewed from the posive end of the corresponding

X-, Y- or Z-axis.

Controlled Point

The controlled point is the point whose posion and rate of moon are controlled. In praccal

applicaon, this point is located somewhere along the spindle axis (Z-axis). The locaon of the

controlled point can be moved out along the spindle axis by specifying some posive value for the

tool length oset. This value is normally the length of the cung tool in use, so that the controlled

point is eecvely located at the boom center of the cung tool.

Work Envelope

The work envelope is dened by the space that can be reached by the controlled point.

Current Posion

The controlled point is always at a locaon called the current posion and the operang system

always knows where that is. Moving the controlled point changes the current locaon. The current

posion is dened by the values displayed on the digital readouts (DRO).

The current posion can also be changed without any actual movement of the controlled point if

any of several events take place:

• Length unit mode (G20/G21) is changed

• Tool length oset is changed

• Work oset is changed

Each of these events can change the values displayed in the DROs.

Coordinated Linear Moon

Coordinated linear moon describes a situaon in which, nominally, each linear axis (X-, Y-, or Z-axis)

moves at a constant speed and all axes move from their starng posions to their end posions at

the same me. This produces moon in a straight line. Coordinated linear moon can be performed

either at the prevailing feed rate or at rapid traverse rate. If physical limits on axis speed make the

desired rate unobtainable, all axes are slowed to maintain the desired path.

In actual moon, it is oen not possible to maintain constant speed because acceleraon or

deceleraon is required at the beginning and/or end of the moon.

Tormach PCNC 1100 User Manual

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