diff --git a/src/mode/cam/tool.js b/src/mode/cam/tool.js
index 11750acf..f243cb34 100644
--- a/src/mode/cam/tool.js
+++ b/src/mode/cam/tool.js
@@ -116,7 +116,7 @@
 
             this.profile = toolOffset;
             this.profileDim = {
-                size: flute_diameter,
+                size: shaft_diameter,
                 pix: profile_pix_iter + 2
             };
             return this;