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--- mycnc:macro_examples [2017/06/14 17:24] – skirillov
+++ mycnc:macro_examples [2017/06/14 17:33] – skirillov
@@ Line 13: / Line 13: @@
 We will add macro M335 to bring A axis to "0", then add a button to run the macro.
-A-axis program position value is mapped to global variable #5044.
+A-axis program position value is mapped to global variable #5044. In the macro we -
-We will arrange a loop, test in the loop A-coordinate and substract 360 degree if current coordinate is more than 360 degree (more than 1 turn). Result value will be stored as current A-axis position and then we will move A-axis to "0"
+  * Check if A-position is positive
+  * Add a code loop,
+  * Test in the loop A-coordinate and subtract 360 degree if current coordinate is more than 360 degree (more than 1 turn).
+  * Store result value as current A-axis position and then
+  * Move A-axis to "0".
+  * Add similar branch for negative A-coordinate value.
 <code php M335>(Move to position A=0)
 #10=#5044 (Get position A)
-if [ #10 LT 0 ] 300
+if [ #10 LT 0 ] 300 (Test If A-position is negative)
+(if positive)
 N100
-if [ #10 LT 180 ] 200
+if [ #10 LT 180 ] 200 (Test if A-position higher than 180 degrees)
-#10 = #10 - 360
+#10 = #10 - 360 (Subtract a whole turn - 360 degree)
-JUMP 100
+JUMP 100 (Jump to begin of the Loop)
 N200
@@ Line 31: / Line 36: @@
 N300
-if [ #10 GT -180 ] 400
+if [ #10 GT -180 ] 400 (Test if A-position lower than -180 degrees)
-#10 = #10 + 360
+#10 = #10 + 360 (Add a whole turn - 360 degree)
-JUMP 300
+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
+G90 G0 A0 (rotate A axis to 0)
 </code>