01-28-2006, 12:21 PM
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 | Moderator | | Join Date: Mar 2003 Location: Canada
Posts: 4,825
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The plunge clearance is an incremental amount, as in "I want the tool to clear by 50 thousandths." OneCNC takes care of converting this value to the appropriate absolute value of Z, no matter where you set the material top at.
Your Rapid plane is the absolute value of the Z level (if programming in absolute mode, which you should be) of the tool.
So, you can simply use .05 in the plunge clearance field, and it will post at Z1.05 if that is where you put the top of your material.
Hint: most programmers recommend using Z0 as a material top, for most work. It makes for clearer thinking, because then, absolute values are the same as incremental values (in your mind), so it helps when checking things over, to know that Z+ means the tool is typically in the clear (except for clamps).
Z- means the tool is in the work zone, and the absolute Z level also corresponds to how deep your cut is (an incremental value).
In your example, you need to look closely to see that the rapid plane only has .2 clearance. If you move your model down so that the material top is at Z0, then your Rapid plane is obviously safe at 1.2" of height above zero.
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