What is the work OFFSET in CNC machine ?

When the tool is on reference position, in the program the Work Start Distance counts from the tool's cutter axis. If you do not give offset to the tool, then the workpiece can be cut more. We can understand this through CNC lathe, The distance from the reference position to the diameter(Z) of the workpiece and the face(X)  which is the distance of the tool touch is considered as work offset. You can easily understand the following fig.

Without OFFSET 

With OFFSET

Let's select a tool to take offset. You can see the tool no.1; T0101

Step 1 - First of all you have to reference the machine.

a) Press “REF” key. (Reference)

b) Press “+x” key.

c) Press “+z” key.

(Tool rich at reference position)

Step 2 – Press “MDI” key.

Step 3 – a) Press “PROG” key.

(In program mode we give the command for tool T0101)

b) Type command T0101 in the system .

c) Press “EOB” key (to complete block).

d) Press “ INSERT” key.

Step 4 – Press “CYCLE START” key.

(If your tool no.1 is not on work position it will become on working position.)

Step 5 - Now we have to touch the edge of the tool by touching the face and diameter of the workpiece for set offset. But here we take offset of Z-axis.

a) Press “Z or X-axis “ key (as you need).

b) Press “100-micron” key.

c) Then move the tool turret by handwheel for touch the tool edge to workpiece face.

[Note: Fanuc CNC have many models there are more changes in MID panel . Some model there is no handwheel at time u can use an alternative method to move tool turret ]

Step 6 – After touching tool we move on the system screen.

Press “OFFSET” key.

Step 7 – For entering an offset data.

a) Select “GEOM”(geometry) option which is on screen by using just below soft key.

b) Set the cursor on a tool no. G001 (Tool no. 1)

c) Then take cursor on Z-axis in front of tool no. G001.

Step 8 – a) Type code Z0.0 by using keys. Then

b) Select “ MEASUR” option which is on screen by using just below soft key.

(here we saw the z-axis offset value save in z column )

Step 9 - Now we want to take the offset of the x-axis. We want to do the same here as we did in the z-axis.

a) Press “X or Z-axis” key. (as you need touch the tool at the workpiece diameter. )

b) Then move the tool turret by handwheel for touch the tool edge to workpiece diameter.

Step 10 – Go on screen,

a) Set cursor on X-axis column front of tool no. G001

b) Type code X50 (actual diameter of the workpiece) by using keys. 

Then

c) Select “ MEASUR” option which is on screen by using just below soft key.

(here we saw the X-axis offset value save in X column )

Step 11 – For tool take home position by using “REF” mode

a) Press “REF” key.

b) Press “+X” key.

c)Press “+Z” key.

for click here  MDI    JOG    EDIT