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Change cycles

To change probe arms automatically using the ACR2, the CMM must be programmed to complete a series of movements using the positions given in this section.  When manually loading the arm into the autochange rack, care must be taken to ensure that the port is locked in the uppermost position.

The co-ordinates of the positions given in this section are relative to the coordinate system defined on the pin datum point XD, YD, ZD calculated in the previous section.

Change cycle:

Technical drawing:  Technical drawing:  PHS-2 ACR2 change cycles

NOTE: D and E axes in correct orientation for change cycle (D0, E-90).

Load sequence:

Load sequence


Axis orientation:

Technical drawing:  Technical drawing:  PHS-2 port in lower latched position

The following figure shows the maximum tolerance acceptable on the CMM drive path during the automatic change cycle.

Nominal CMM drive path:

Nominal CMM drive path

The table below gives co-ordinates for the points in the automatic change cycle relative to the pin datum point XD, YD, ZD.

PHS-2 axis origin position relative to pin datum point XD, YD, ZD:

Point

XYZ

A

+74 -135.5 +68.5

B

+74 +14.5 +68.5

C

+50 +14.5 +68.5

C1

+50 +14.5 -35.5

D

+50 +14.5 -31.5

E

+53.5+14.5-31.5

F

+53.5

-135.5

-31.5

The following table gives the incremental values for the moves between points in the automatic change cycle:

Moves in automatic change cycle:

MoveAxisIncremental value

Function

A to B
Y+150

PHS-2 moves in (or out of) port without probe arm loaded

B to C
X-24

PHS-2 latches (or unlatches) port with probe arm unlocked

C to C1
Z-104

Arm locking move (load cycle only)

D to C
Z100

Arm unlocking move (unload cycle only)

C1 to D
Z+4

Locking mechanism backoff (load cycle only)

D to E
X+3.5

PHS-2 latches (or unlatches) port with probe arm locked

E to FY-150

PHS-2 moves in (or out of) port with probe arm locked