From b2699eb44d93a08b8505d06adb6f776bb729bf10 Mon Sep 17 00:00:00 2001
From: unknown <roberthart56@gmail.com>
Date: Wed, 27 Apr 2022 12:18:26 -0400
Subject: [PATCH] add to readme

---
 UrumbotXYZ/fixed_axis/README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/UrumbotXYZ/fixed_axis/README.md b/UrumbotXYZ/fixed_axis/README.md
index 3f545b7..7c113e3 100644
--- a/UrumbotXYZ/fixed_axis/README.md
+++ b/UrumbotXYZ/fixed_axis/README.md
@@ -118,6 +118,7 @@ Kevlar string wrapped around stepper axle, tension in string opposed by spindle
  - With this string, wrapped directly around motor shaft, and using weight of the spindle as the sole downward force, it is possible to mill a reasonable PCB with the conical bit, and wax milling goes well.  Measured dF/dz is much higher than before, 120 N/mm.  
  - The xy stage by itself has dF/dy ~ 40 N/mm.  With wax block on table, at the top of the block dF/dy = 30 N/mm.  Extra compliance is due to rotation about the single x-beam as a function of sideways flex of bearings.  
  - Applied kevlar string to the xy stage.  Now the stiffness of the stage, dF/dy, has doubled to 80 N/mm.  When the table is added, and a wax block attached, the stiffness at the top of the block is still low, about 40 N/mm.  Now the 20mm width of the x-beam is the limiting design parameter.
+ - Made an eccentric nut as a bearing adjuster, following design from Ender machine.  See below.
 
 [Youtube video of wax milling](https://youtube.com/shorts/Uz45yHX_n6A?feature=share)
 <img src=./img/milled_wax.jpg width=30%>
-- 
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