Rule of thumb on CNC, if you move away from the chuck face or the center of
rotation you are moving in a + (positive) direction.
you question on X dimension can be answered 2 ways depending if you have an
OD tool or an ID tool and also if you are on radius or diameter program.
So refer to the rule of thumb and you should do ok.
remember, you can test all of this in Air CUTS, move your Z origin in the
positive. experiment without a wreck.
CB
On Tue, Oct 14, 2008 at 10:13 PM, acondit <[EMAIL PROTECTED]> wrote:
> I am trying to wrap my head around lathe tool offsets.
>
> Say I have a reference tool with both X and Y offsets of zero.
>
> Now I have a threading tool and it sticks out 0.252" farther in the X
> direction
> than the reference tool. Is that a 0.252 positive X offset?
>
> It sticks out 0.176" farther towards the spindle nose than the reference
> tool.
> Is that also a positive Z offset?
>
> What if I have a smaller tool can I use a negative offset for Z and/or X
> offsets?
>
> If I back off my toolpost to change tools (part of the gcode) and follow
> the
> tool change code with a G43, will my tool move into the proper position
> when I
> make the next move if all my moves are setup based on the reference tool?
> In
> particular, if I put on a cutoff tool, an move a cut off position based on
> the
> front corner of my reference tool (and have my tool offsets for the cutoff
> tool
> set correctly) will my cutoff tool be in the correct position for parting
> off?
>
> Thanks,
> Alan
>
>
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