Hi Art,
the way to do grooves is to use 2 offsets, for example if we use tool 7 we would use say offset 7 and offset 17, offset 7 would have a X and a Z offset for the diameter and the front edge of the tool, offset 17 would have the same X offset as offset 7 but the Z offset would be for the back edge of the tip.
E.G
Our tool tip is 1.5mm wide, we set our diameter datum as normal, we touch the front edge of the tip on the front of the job and set our Z offset, e.g. -100 The offset for the back of the tip would be entered into offset 17 as Z-101.5, that will put the back edge of the tip at the end of the job if we entered in MDI 'G00 Z0 T0717'
Man that's a lot of offsets
The following code is what I would use to produce the drawing below.
N7 T0707 M8 (GROOVE 11.5*2)
(CENTRE TIP 1.5)
G00 X13.5 Z-4.75 G97 S750 M3
G01 X11.5 F.1 (CENTRE OF GROOVE)
G00 X13.5
Z-5.2 (USE TIP - FRONT EDGE)
G01 X12.5 F1.
G02 X12.1 Z-5. R.2 F.05
G01 X11.5 F.1
G00 X13.5
Z-2.8 T0717 (USE TIP BACK EDGE)
G01 X12.5 F1.
G03 X12.1 Z-3. R.2 F.05
G01 X11.5 F.1
G00 X13.5
X120. Z120. T0700
M1
Most grooving tools have a radius to stop them snipping the edge, the idea of the 2 offsets is to compensate for wear and maintain position.
Graham.
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