add milling

UrumbotXY/README.md

@@ -33,3 +33,18 @@ Pen:
 Drawing:
 
 <img src=video/corexy_spiral.mp4 width=100%><br>
+
+Circuitboard Milling
+
+Dec 2021.  Set up CoreXY for milling, using a linear axis and a spare Roland MDX-20 spindle.  Keep the original python code, removing the homing step and changing speed to 5 mm/s.  Run a text file for xy motion.  Start, -10.0,-10.0:-10.8,-10.0: -0.8,0.0: 0.0,0.0.
+
+Axis setup:
+
+Movie:
+
+Closeup of traces:
+
+What was learned:
+
+ - one
+ - two

UrumbotXY/code/test.py

+class A(object):
+    def __init__(self, variable_A=1, variable_B=2):
+        self.variable_A = variableA
+        self.variable_B = variableB
+
+    def functionA(self, param):
+    return param + self.variable_A
+