tool nose offset
tool nose offset
(OP)
I need to draw in autocad the same radius offset that is created by g41 and 42 in cnc gcode. As you do a g2 and g3 raduis the actual tool position is not actually offset by the amount of radius. How do you draw the g2,g3 with raduis comp in AutoCad?
Robert Setree
www.advanced-grinding.com





RE: tool nose offset
RE: tool nose offset
Robert Setree
www.advanced-grinding.com
RE: tool nose offset
What kind of machine? 3axis milling?
What kind of tool? Flat nose end mill?
If xy defines the surface of the table. Is the arc you want in the xz plane?
if so...
Exaple of a 90° arc. xy plane for simplification
(arc1) draw an arc rad 12" from 0° to 90°
(line1) draw a line from the 0° end of the arc 0.5" long in the x direction. This represents the cutter (0.5" flat end mill) at the beginnign of the arc.
(line2) draw a line from the 90° end of the arc 0.5" long in the x direction. This represents the cutter (0.5" flat end mill) at the end of the arc.
(line3) draw a line from the mid point of line2 12" in the negative y direction (radius of arc1)
(ellipse1) draw an ellipse centered on the lower end of line3 with the two remaining point the midpoint of line1 and line2
ellipse1 from 0° to 90° will then define the travel path of the tool to create arc 1.
Is this what you were looking for?
RE: tool nose offset
Robert Setree
www.advanced-grinding.com
RE: tool nose offset
Where on the tool is the defined point? where does trhe machine think the corner of the tool is?
Assume: (please forgive the poor artistry)
+ --
/ \
/ \
| |
| |
is the + the defined point of the tool?
RE: tool nose offset
RE: tool nose offset
. Notice the g2 line has 2 "z" s which means it will not work. I may understand this by decerning the difference between the drawing certerline of the raduis and centerline that must be used by the gcode. Thanks for everyones help so far. I am thinking there is probable a dxf to gcode converter that does this math internally.
Bob
Robert Setree
www.advanced-grinding.com
RE: tool nose offset
RE: tool nose offset
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Bob
Robert Setree
www.advanced-grinding.com