diff --git a/notes.md b/notes.md
index 9db6c67a..9d70e394 100644
--- a/notes.md
+++ b/notes.md
@@ -56,7 +56,6 @@
 
 # CAM
 
-* `B` fix ball mill profile
 * `B` climb vs conventional not fully consistent after refactor
 * `B` outside cutting direction in roughing mode inverted
 * `B` clear voids has double interior pass because wrong offset shadow used
diff --git a/src/mode/cam/animate.js b/src/mode/cam/animate.js
index f57c5d08..1ef1c0f2 100644
--- a/src/mode/cam/animate.js
+++ b/src/mode/cam/animate.js
@@ -367,11 +367,12 @@ self.kiri.loader.push(function() {
         }
         tool = new CAM.Tool({ tools }, undefined, toolnum);
         tool.generateProfile(rez);
-        const flen = tool.fluteLength() || 30;
+        const flen = tool.fluteLength() || 15;
+        const slen = tool.shaftLength() || 15;
         // const frad = tool.fluteDiameter() / 2;
         const prof = tool.profile;
         const { size, pix } = tool.profileDim;
-        const { pos, ind } = createGrid(pix, pix, {x:size, y:size, z:flen}, rez);
+        const { pos, ind } = createGrid(pix, pix, {x:size, y:size, z:flen+slen}, rez);
         const mid = Math.floor(pix/2);
         // deform mesh to fit tool profile
         for (let i=0, il=prof.length; i < il; ) {
diff --git a/src/mode/cam/tool.js b/src/mode/cam/tool.js
index 97de4e17..1bf40ca9 100644
--- a/src/mode/cam/tool.js
+++ b/src/mode/cam/tool.js
@@ -51,6 +51,10 @@
             return this.unitScale() * this.tool.taper_tip;
         }
 
+        shaftLength() {
+            return this.unitScale() * this.tool.shaft_len;
+        }
+
         shaftDiameter() {
             return this.unitScale() * this.tool.shaft_diam;
         }
@@ -77,7 +81,8 @@
                 profile_pix_iter = shaft_pix_int + (1 - shaft_pix_int % 2),
                 toolCenter = (shaft_pix_int - (shaft_pix_int % 2)) / 2,
                 toolOffset = [],
-                larger_shaft = shaft_diameter - flute_diameter > 0.001;
+                larger_shaft = shaft_diameter - flute_diameter > 0.001,
+                rpixsq = flute_radius_pix_float * flute_radius_pix_float;
 
             // for each point in tool profile, check inside radius
             for (let x = 0; x < profile_pix_iter; x++) {
@@ -90,7 +95,9 @@
                         // flute offset points
                         let z_offset = 0;
                         if (ball) {
-                            z_offset = (1 - Math.cos((dist_from_center / flute_radius_pix_float) * HPI)) * -flute_radius;
+                            let rd = dist_from_center * dist_from_center;
+                            z_offset = Math.sqrt(rpixsq - rd) * resolution - flute_radius;
+                            // z_offset = (1 - Math.cos((dist_from_center / flute_radius_pix_float) * HPI)) * -flute_radius;
                         } else if (taper && dist_from_center >= tip_radius_pix_float) {
                             z_offset = ((dist_from_center - tip_radius_pix_float) / tip_max_radius_offset) * -shaft_offset;
                         }