Using G2/G3 but can't use all build area.

Penola

Hi

I've been trying to setup a 1/4 circle wipe/purge line on my Delta.
According to my Config Override G I have a radius of around 135mm

; config-override.g file generated in response to M500 at 2019-12-10 17:24
; This is a system-generated file - do not edit
; Delta parameters
M665 L271.500:271.500:271.500 R135.758 H290.197 B105.0 X0.255 Y-0.009 Z0.000
M666 X0.935 Y-0.279 Z-0.655 A0.00 B0.00
; Heater model parameters

However I get outside machine limit fail if running much more than 100mm offset in G3 (as below).
;FLAVOR:Marlin
;TIME:822
;Filament used: 1.61397m
;Layer height: 0.25
;MINX:-14
;MINY:-14
;MINZ:0.2
;MAXX:14
;MAXY:14
;MAXZ:19.65
;Generated with Cura_SteamEngine 4.4.0
M140 S60
M105
M190 S60
M104 S220
M105
M109 S220
M82 ;absolute extrusion mode
G21 ;metric values
G28 ; home all axes
M92 E415 ; Sets the correct E-steps for Bondtech
M107

G92 E0 ; reset extrusion distance
G1 X-100 Y0 Z0.3 F3000 ; move to arc start
G3 X0 Y-100 I100 J0 E40 F400 ; lay arc stripe 90deg
G92 E0 ; reset extrusion distance
G1 X0 Y-50 Z4 E-2 F3000 ; get off the bed

G90 ;absolute positioning

;G92 E0 ;zero the extruded length
;G1 F200 E3 ;extrude 3mm of feed stock
;G92 E0 ;zero the extruded length again
G1 F120
;Put printing message on LCD screen
M117 Printing...

Have any of you tried similar?
The fault occur on the Duet during start of print only and printer just stops there.
I know there is a collision check introduced but I'm a little puzzled that there is a difference of 35mm from Delta R-value to max possible offset in G2/G3 command

blt3dp

I did the same thing, for the I and J you're describing the center of the arc relative to the center of the current coordinate.

G3 X0 Y-100 I100 J0 E40 F400 ; lay arc stripe 90deg

At that position, your I and J parameters should be I0 and J100 if you are describing 0,0

I don't believe it takes any probe offsets into consideration, just the nozzle position.

Penola

@blt3dp I have just found another place in "Machine properties - Drive configuration" that +/- 105 in X/Y is the setting here and this matches the check for limits in my problem.

Now the function works fine and I get the 1/4 circle/arc at the edge of the build plate to ensure good start of print as filament line is purge/primed and ready to work when starting the job.

So I guess my problem is solved/explained.

Thanks for the interest here

Penola

@Penola

I tried with 104.99 and this works fine so yes the check lies against the 105mm

droftarts

@Penola said in Using G2/G3 but can't use all build area.:

M665 L271.500:271.500:271.500 R135.758 H290.197 B105.0 X0.255 Y-0.009 Z0.000

R135 is your delta radius. B105 is your safe print radius. See delta parameters meanings here: https://duet3d.dozuki.com/Wiki/Gcode#Section_M665_Set_delta_configuration

Ian

Penola

@droftarts
Thanks a lot.
Haven’t noticed the safe radius setting in M665.
Makes all the sense in the world now