- Difference between "Rapid Approach" vs "Approach" points in a Post Processor
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Difference between "Rapid Approach" vs "Approach" points in a Post Processor
In my post processor I see:
*RAPID*
N"lnbr" G00 "x" "y" "z"
*END_SECTION*
*RAPID_APPROACH*
N"lnbr" "x" "y" "z"
*END_SECTION*
*APPROACH*
N"lnbr" G01 "x" "y" "z" F"feedz"
N"lnbr" z0.100
N"lnbr" M08
*END_SECTION*
Am I correct that the workpiece is first approached at full rapid speed to some point and then approached at a feed rate to a much closer point (prior to the first cut)?
How close are these approach points in relation to the workpiece?
Can these points be configured via the post processor ... say to make the rapid approach point one inch and the second approach point 0.100"?
In preliminary testing of a new post, it would be very reassuring to be able to closely watch the approach with the rapid & feeds manually reduced to visually judge that there are no major errors in offsets/zero settings.
I appreciate any help with understanding how this actually works!!!
Best regards!
Bruce
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Community Moderator
Re: Difference between "Rapid Approach" vs "Approach" points in a Post Processor
RAPID is the traversal to a new toolpath where a RAPID_APPROACH is used until an APPROACH is activated which is the final descent. But beware, the RAPID_APPROACH is not always used, you can get a program that goes from RAPID directly to APPROACH.
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Re: Difference between "Rapid Approach" vs "Approach" points in a Post Processor
Svenakela,
I appreciate the reply. Let me see if I have this straight by a practical example from a code snippet:
(M17Vgroove)
N100 G40 G56 G80 G90 G94
(Bullnose 60radius)
N101 G111 T1
N102 M01
N103 S9000 F80 M03
N104 G00 X-1.53442 Y-3.96625
N105 Z1
N106 Z0.00331
N107 G01 Z-0.09669 F40
N108 M08
Lines 104 is a "Rapid" move and Line 107 is an "Approach" ... and lines 105 and 106 are "Rapid Approaches" since they are not directly connecting to the beginning of the next toolpath.
That seem right?
Am I correct that Rapid Approaches are internal to madCAM program and the machinist can't modify them?
Thanks!
B
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Community Moderator
Re: Difference between "Rapid Approach" vs "Approach" points in a Post Processor
I think you are correct.
And yes, the RAPID_APPROACH is somewhat internal, the G code processor decides if it can use a RAPID_APPROACH or not when the G-code is generated. So lets say you want to automatically open an air valve (or start a plasma torch) you should put that in the APPROACH part of the post processing config.
/S
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- Difference between "Rapid Approach" vs "Approach" points in a Post Processor
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