Tool Offset Management

M491.1 - Tool Break Test

Description

M491.1 performs a tool break check by calibrating the current tool and comparing its length to a previously stored tool length offset (TLO). If the difference exceeds the specified tolerance, it indicates potential tool breakage and halts the machine.

Parameters

• H: Tolerance value for break detection (optional, defaults to 0.1mm)

  • Must be >= 0.02mm

  • If set too small, the command will halt with an error

Demo of M491.1

Example

M491.1              ; Perform tool break check with default tolerance (0.1mm)
M491.1 H0.05        ; Perform tool break check with 0.05mm tolerance

M493 - Tool Length Offset (TLO) Management

Description

M493 manages tool length offset (TLO) settings for the current tool. It can set tool offsets, change tools, and report TLO values.

Parameters

• Subcode 0/1: Set tool offset from last probe position

• Subcode 2: Set new tool number

• T: Tool number (required)

• Subcode 3: Set current tool offset manually

• Z: Tool length value (optional)

• H: Offset above Z0 (optional)

• Subcode 4: Report current TLO values

Example

M493                 ; Set tool offset from last probe
M493.2 T1           ; Set tool 1 as active
M493.3 Z10.5        ; Set tool length to 10.5mm
M493.3 H2.0         ; Set TLO from current position with 2mm offset
M493.4              ; Report current TLO values

M493.1 - Set Tool Offset (Same as M493)

Description

M493.1 sets the tool offset from the last probe position. This is identical to M493 with subcode 0 or 1.

Parameters

None

Example

M493.1              ; Set tool offset from last probe position

M493.2 - Set New Tool

Description

M493.2 sets a new tool as the active tool and updates the system accordingly.

Parameters

• T: Tool number (required)

Example

M493.2 T5           ; Set tool 5 as active

M493.3 - Set Current Tool Offset Manually

Description

M493.3 sets the current tool offset manually using either a Z value or an H offset from the current position.

Parameters

• Z: Tool length value (optional)

• H: Offset above Z0 (optional)

Demo of M493.3

Example

M493.3 Z15.2        ; Set tool length to 15.2mm
M493.3 H3.0         ; Set TLO from current position with 3mm offset

M493.4 - Report Current TLO

Description

M493.4 reports the current tool length offset values to the console.

Parameters

None

Example

M493.4              ; Report current TLO values