diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index 94b44438..0ea743dc 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -1791,7 +1791,7 @@ CAM.init = function(kiri, api) {
         menu:      UC.newRow([ UC.newButton("select", func.surfaceAdd) ], {class:"ext-buttons f-row"}),
     };
 
-    const drillOp =createPopOp('drill', {
+    createPopOp('drill', {
         tool:    'camDrillTool',
         spindle: 'camDrillSpindle',
         down:    'camDrillDown',
@@ -1801,7 +1801,7 @@ CAM.init = function(kiri, api) {
         mark:    'camDrillMark',
         precision:'camDrillPrecision',
         thru:    'camDrillThru',
-
+        fromTop: 'camDrillFromStockTop',
     }).inputs = {
         tool:     UC.newSelect(LANG.cc_tool, {}, "tools"),
         sep:      UC.newBlank({class:"pop-sep"}),
@@ -1810,7 +1810,8 @@ CAM.init = function(kiri, api) {
         down:     UC.newInput(LANG.cc_sdwn_s, {title:LANG.cc_sdwn_l, convert:UC.toFloat, units:true}),
         dwell:    UC.newInput(LANG.cd_dwll_s, {title:LANG.cd_dwll_l, convert:UC.toFloat}),
         lift:     UC.newInput(LANG.cd_lift_s, {title:LANG.cd_lift_l, convert:UC.toFloat, units:true, show:() => !poppedRec.mark}),
-        mark:     UC.newBoolean(LANG.cd_mark_s, undefined, {title:LANG.cd_mark_l}),
+        mark:     UC.newBoolean(LANG.cd_mark_s,undefined, {title:LANG.cd_mark_l, show:() => !poppedRec.fromTop}),
+        fromTop:  UC.newBoolean(LANG.cd_ftop_s,undefined, {title:LANG.cd_ftop_l, show:() => !poppedRec.mark}),
         sep:      UC.newBlank({class:"pop-sep"}),
         thru:     UC.newInput(LANG.cd_dtru_s, {title:LANG.cd_dtru_l, convert:UC.toFloat, units:true,show:() => !poppedRec.mark}),
         precision:UC.newInput(LANG.cd_prcn_s, {title:LANG.cd_prcn_l, convert:UC.toFloat, units:true,show:() => !poppedRec.mark}),
diff --git a/src/kiri-mode/cam/slice.js b/src/kiri-mode/cam/slice.js
index 9f0db31a..b995d74b 100644
--- a/src/kiri-mode/cam/slice.js
+++ b/src/kiri-mode/cam/slice.js
@@ -564,6 +564,11 @@ CAM.holes = async function(settings, widget, individual, rec,onProgress) {
         onProgress(0.75+(i/circles.length*0.25),"assemble holes")
     }
     drills.forEach( h=>{
+        if(rec.fromTop){
+            // set z top if selected
+            h.depth += wztop - h.z
+            h.z = wztop
+        }
         delete h.overlapping //for encoding
         h.diam = toolDiam // for mesh generation
         h.selected = (!individual && Math.abs(h.area - area) <= area * 0.05 ); //for same size selection
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 72a84134..d9c32b46 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -599,6 +599,8 @@ self.kiri.lang['en-us'] = {
     cd_dtru_l:      ["additional drill depth below part bottom","overrides global z thru","0 to disable"],
     cd_mark_s:      "marking",
     cd_mark_l:      ["only mark holes, do not drill out","the step down setting is used","to determine how deep to mark"],
+    cd_ftop_s:      "from stock top",
+    cd_ftop_l:      ["drill from stock top","instead of part surface"],
     cd_prcn_s:      "precision",
     cd_prcn_l:      ["distance between slices","to search for holes","in workspace units","lower is slower and","uses more memory","0 = only flats"],