add corexy link

UrumbotXY/README.md

+# UrumbotXY
+
+This project is a [corexy](https://corexy.com/theory.html) 2D motion system using serialstep
+
+<img src=img/corexy_pen.jpg width=100%><br>
+
 ## CoreXY
 
 For a simple coreXY motion system, here is the list of parts you need to make:

UrumbotXYZ/moving_z_axis/README.md

@@ -36,7 +36,7 @@ Assemble.  When integrating z-axis on moving beam, it is necessary to insert at
 
  - While cutting wood block, the 1/8" single flute end mill is pulled in x,y, and z by the cutting forces.  The video and photo shows the rough cutting and the wobble as the cutting progresses.
 
-<img src=./img/wood_mill.jpg width=40%>
+<img src=./img/wood_mill.jpg width=40%></br>
 
 <img src=./img/moving_z_wood.cmp.mp4 width=40%>
 
@@ -45,7 +45,3 @@ Results when attempting to cut a PCB show the same problems.  When the 1/64" end
 ###  Conclusions
 
 This configuration is not stiff enough at the endmill tip to mill successfully.
-
-
-
-

Urumbu_short_z/README.md

@@ -3,6 +3,7 @@
 Below is a short z-axis integrated into the xy machine.  The z axis has about 50mm travel.  Next, demonstrate wax cutting and PCB milling with this configuration, as well as measuring z-axis resolution and hysteresis.
 
 <img src=./img/z-axis.jpg width=40%>
+
 <img src=./img/xyz_machine.jpg width=40%><br><br>