diff --git a/notes.md b/notes.md
index 7487d10f..dcb07bca 100644
--- a/notes.md
+++ b/notes.md
@@ -59,6 +59,7 @@
 * `B` outside cutting direction in roughing mode inverted
 * `B` on rotation, tabs dissociate from parts whose center changes with rotation
 
+* `F` clip-to option under "stock"
 * `F` add climb/conventional into each operation
 * `F` new registration style: offset cutout
 * `F` z thru should apply to any thru hole
diff --git a/src/geo/polygon.js b/src/geo/polygon.js
index 68dd21fa..402ad5bd 100644
--- a/src/geo/polygon.js
+++ b/src/geo/polygon.js
@@ -1440,7 +1440,7 @@
         }
     };
 
-    PRO.cut = function(polys) {
+    PRO.cut = function(polys, inter) {
         let target = this;
 
         if (!target.open) {
@@ -1460,13 +1460,14 @@
             cfil = clib.PolyFillType,
             clip = new clib.Clipper(),
             ctre = new clib.PolyTree(),
+            type = inter ? ctyp.ctIntersection : ctyp.ctDifference,
             sp1 = target.toClipper(),
             sp2 = POLY().toClipper(polys);
 
         clip.AddPaths(sp1, ptyp.ptSubject, false);
         clip.AddPaths(sp2, ptyp.ptClip, true);
 
-        if (clip.Execute(ctyp.ctDifference, ctre, cfil.pftEvenOdd, cfil.pftEvenOdd)) {
+        if (clip.Execute(type, ctre, cfil.pftEvenOdd, cfil.pftEvenOdd)) {
             let cuts = POLY().fromClipperTree(ctre, target.getZ(), null, null, 0);
             cuts.forEach(no => {
                 // heal open but really closed polygons because cutting
diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index fa40e946..16b974f1 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -479,6 +479,7 @@
                     camStockY: 5,
                     camStockZ: 0,
                     camStockOffset: true,
+                    camStockClipTo: false,
                     camStockOn: true,
                     camConventional: false, // outputClockwise
                     outputOriginCenter: false,
diff --git a/src/kiri/init.js b/src/kiri/init.js
index 991aa25f..5877a0b4 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -1649,6 +1649,7 @@
             camStockY:           UC.newInput(LANG.cs_dpth_s, {title:LANG.cs_dpth_l, convert:UC.toFloat, bound:UC.bound(0,9999), modes:CAM, units:true}),
             camStockZ:           UC.newInput(LANG.cs_hght_s, {title:LANG.cs_hght_l, convert:UC.toFloat, bound:UC.bound(0,9999), modes:CAM, units:true}),
             camStockOffset:      UC.newBoolean(LANG.cs_offs_s, onBooleanClick, {title:LANG.cs_offs_l, modes:CAM}),
+            camStockClipTo:      UC.newBoolean(LANG.cs_clip_s, onBooleanClick, {title:LANG.cs_clip_l, modes:CAM}),
             camSep:              UC.newBlank({class:"pop-sep"}),
             camStockOn:          UC.newBoolean(LANG.cs_offe_s, onBooleanClick, {title:LANG.cs_offe_l, modes:CAM}),
 
diff --git a/src/mode/cam/ops.js b/src/mode/cam/ops.js
index 0b86498e..555ca279 100644
--- a/src/mode/cam/ops.js
+++ b/src/mode/cam/ops.js
@@ -105,8 +105,9 @@
         slice(progress) {
             let { op, state } = this;
             let { settings, widget, slicer, sliceAll, unsafe } = state;
-            let { updateToolDiams, thruHoles, tabs, cutTabs } = state;
+            let { updateToolDiams, thruHoles, tabs, cutTabs, cutPolys } = state;
             let { tshadow, shadowTop, ztOff, zBottom, zMax } = state;
+            let { process, stock } = settings;
 
             let roughIn = op.inside;
             let roughTop = op.top;
@@ -261,6 +262,11 @@
 
                 if (!offset) return;
 
+                if (process.camStockClipTo) {
+                    let rect = newPolygon().centerRectangle(stock.center, stock.x, stock.y);
+                    offset = cutPolys([rect], offset, slice.z, true);
+                }
+
                 // elimate double inset on inners
                 offset.forEach(op => {
                     if (op.inner) {
@@ -376,7 +382,8 @@
         slice(progress) {
             let { op, state } = this;
             let { settings, widget, slicer, sliceAll, tshadow, thruHoles, unsafe } = state;
-            let { updateToolDiams, zThru, zBottom, shadowTop, tabs, cutTabs } = state;
+            let { updateToolDiams, zThru, zBottom, shadowTop, tabs, cutTabs, cutPolys } = state;
+            let { process, stock } = settings;
 
             let toolDiam = this.toolDiam = new CAM.Tool(settings, op.tool).fluteDiameter();
             updateToolDiams(toolDiam);
@@ -497,6 +504,11 @@
                     CAM.addDogbones(offset, toolDiam / 5);
                 }
 
+                if (process.camStockClipTo) {
+                    let rect = newPolygon().centerRectangle(stock.center, stock.x, stock.y);
+                    offset = cutPolys([rect], offset, slice.z, true);
+                }
+
                 // offset.xout(`slice ${slice.z}`);
                 slice.camLines = offset;
                 if (false) slice.output()
diff --git a/src/mode/cam/slice.js b/src/mode/cam/slice.js
index a4bc7e47..2b98f4a1 100644
--- a/src/mode/cam/slice.js
+++ b/src/mode/cam/slice.js
@@ -105,6 +105,7 @@
             bounds,
             tabs,
             cutTabs,
+            cutPolys,
             slicer,
             sliceAll,
             updateToolDiams,
@@ -265,10 +266,15 @@
         return true;
     };
 
-    function cutTabs(tabs, offset, z) {
-        let noff = [];
+    function cutTabs(tabs, offset, z, inter) {
         tabs = tabs.filter(tab => z < tab.pos.z + tab.dim.z/2).map(tab => tab.off).flat();
-        offset.forEach(op => noff.appendAll( op.cut(POLY.union(tabs, 0, true)) ));
+        return cutPolys(tabs, offset, z, false);
+    }
+
+    function cutPolys(polys, offset, z, inter) {
+        let noff = [];
+        // tabs = tabs.filter(tab => z < tab.pos.z + tab.dim.z/2).map(tab => tab.off).flat();
+        offset.forEach(op => noff.appendAll( op.cut(POLY.union(polys, 0, true), inter) ));
         if (noff.length > 1) {
             let heal = 0;
             // heal/rejoin open segments that share endpoints
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index e5e22e62..242fe579 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -435,6 +435,8 @@ kiri.lang['en-us'] = {
     cs_hght_l:      "height (z) in workspace units\n0 defaults to part size",
     cs_offs_s:      "offset",
     cs_offs_l:      "use width, depth, height\nas offsets from max\npart size on platform",
+    cs_clip_s:      "clip to",
+    cs_clip_l:      "rough and outline\nclip cutting paths\nto defined stock",
     cs_offe_s:      "enable",
     cs_offe_l:      "enable milling stock",