Differences

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--- mycnc:move-a-to-0 [2017/09/04 12:06] – created skirillov
+++ mycnc:move-a-to-0 [2019/11/15 08:43] – ivan
@@ Line 2: / Line 2: @@
 For some applications A-axis is programmed as endless rotation.
-Program position of A may come to many hyndreds degree after G-code finished. See screenshot example below -
+Program **A** position may come to many thousands degree after G-code finished. See screenshot example below -
 {{mycnc:mycnc-1280m4-001.png}}
-To start new job A position should be roll back to about "0" position. Jogging to "0" may take a long time. In some cases it's possible just reset A position, but A axis orientation will be lost.
+To start new job A position should be roll back to about "0" position. Jogging to "0" may take a long time (can be hundreds of complete turn to run). In some cases it's possible just reset A position, but A axis orientation will be lost.
-The best way to substract from current A-coordinates a whole number of turns (360 degree), then move to "0".
+The best way to subtract a number of complete turns (360 degree), then move to "0" for the rest of A.
 This can be done through macro-programming.
@@ Line 21: / Line 21: @@
   * Add similar branch for negative A-coordinate value.
-<code php M335>(Move to position A=0)
+<code php M309>
-#10=#5044 (Get position A)
+G90G0Z[#7020]
+#10=#5044 (Store A coordinate in register #10)
-if [ #10 LT 0 ] 300 (Test If A-position is negative)
+N10
-(if positive)
+IF [#10 LT 180]  20
-N100
+#10=#10-360
-if [ #10 LT 180 ] 200 (Test if A-position higher than 180 degrees)
+JUMP 10
-#10 = #10 - 360 (Subtract a whole turn - 360 degree)
+N20
-JUMP 100 (Jump to begin of the Loop)
+IF [#10 GT -180]  50
+#10=#10+360
+JUMP 20
-N200
+N50
-JUMP 400
+G91 G0 A [-1*#10]
+G90 G10 L70 P0 A0
+G90 G10 L70 P#5220 A0</code>
-N300
+[[mycnc-screen:1280_series_screen_configuration_examples#add_move_a_to_0_button_to_run_macro_with_confirmation|Add a "Move A to 0" button example]]
-if [ #10 GT -180 ] 400 (Test if A-position lower than -180 degrees)
-#10 = #10 + 360 (Add a whole turn - 360 degree)
-JUMP 300 (Jump to begin of the Loop)
-N400
-G90 G10 L70 P#5220 A#10 (store #10 value as A-axis program position)
-G90 G0 A0 (rotate A axis to 0)
-</code>
-[[mycnc:mycnc_setup#add_move_a_to_0_button_to_run_macro_with_confirmation|Add "move A to 0" button]]