Mitsubishi Electric MELDAS C6 Instruction Manual page 76

(Refer to "2.3 (II). Tool Offset
(M system)" for M system.
(b) Setting the external workpiece coordinate offset data
1) Reference point return
2) Select the mode
3) Input the tool measurement mode signal
4) Select the tool
5) Cut workpiece edges
6) Set the Z axis external workpiece offset data with the workpiece measurement signal input
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2. Screen Operation of A985GOT
After turning the power ON, establish the coordinate system by carrying out dog-type
reference point return.
When using the absolute position detection specifications, carry out zero point initialization if
the absolute position is not established.
Set the mode selection switch to the manual mode (either [handle], [jog] or [rapid traverse]).
Set the tool measurement mode signal to "1".
The tool measurement mode is entered with steps 1), 2) and 3).
Issue the T command with MDI operation, etc., and select the tool.
Notes) 1. Set the compensation No. of the tool to be selected in the R register (R
register corresponding to the compensation No.).
2. Preset the tool length data and wear data for the tool to be used.
If the workpiece edges have not been cut, cut them slightly to flatten the workpiece edges.
1. Do not move the tool in the Z axis direction after cutting the workpiece edges.
Notes)
2. If the edges do not need to be cut, position to the measurement position.
Turn ON the workpiece measurement signal. The Z axis external workpiece coordinate offset
data will be automatically calculated from the machine value at the time the signal is turned
ON and the tool compensation data of the tool used. The data will then be set.
(i) Details of automatic calculation expression
The external workpiece coordinate offset data is automatically calculated with the following
expression.
(Refer to "External workpiece coordinate offset calculation diagram")
External workpiece coordinate offset
= Machine coordinate value – Tool compensation data
The tool compensation data used for the measurement is selected with the base
specification parameter "#1226 aux10 bit0".
aux10 bit0 Tool compensation data
0 Tool length data + nose wear data
1 Tool length data
External workpiece coordinate off set
Tool compensation
amount
Workpiece coordinate
system zero point
External workpiece coordinate offset calculation diagram
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2.3 (I). Tool Offset (L system)
Machine value
Basic machine
coordinate
zero point
Tool post
I - 61
system