diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index 7e06e42d..537acb73 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -429,6 +429,7 @@
                     camDrillDwell: 250,     // drillDwell
                     camDrillLift: 2,        // drillLift
                     camDrillingOn: false,   // drillingOn
+                    camDrillReg: "none",
                     camTabsAngle: 0,
                     camTabsCount: 4,
                     camTabsWidth: 5,
diff --git a/src/kiri/init.js b/src/kiri/init.js
index 33b3356c..34aa2d7d 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -1404,6 +1404,8 @@
             camDrillLift:        UC.newInput(LANG.cd_lift_s, {title:LANG.cd_lift_l, convert:UC.toFloat, modes:CAM}),
             camDrillSep:         UC.newBlank({class:"pop-sep"}),
             camDrillingOn:       UC.newBoolean(LANG.enable, onBooleanClick, {modes:CAM}),
+            camDrillSep:         UC.newBlank({class:"pop-sep"}),
+            camDrillReg:         UC.newSelect(LANG.cd_regi_s, {modes:CAM, title:LANG.cd_regi_l}, "drillreg"),
             camTabs:             UC.newGroup(LANG.ct_menu, null, {modes:CAM, marker:true}),
             camTabsAngle:        UC.newInput(LANG.ct_angl_s, {title:LANG.ct_angl_l, convert:UC.toInt, bound:UC.bound(0,360), modes:CAM}),
             camTabsCount:        UC.newInput(LANG.ct_numb_s, {title:LANG.ct_numb_l, convert:UC.toInt, bound:UC.bound(1,20), modes:CAM}),
diff --git a/src/kiri/main.js b/src/kiri/main.js
index 549322aa..4f45aef5 100644
--- a/src/kiri/main.js
+++ b/src/kiri/main.js
@@ -142,6 +142,11 @@
             { name: "2", id: 2 },
             { name: "4", id: 4 },
             { name: "8", id: 8 }
+        ],
+        drillreg: [
+            { name: "none" },
+            { name: "x axis" },
+            { name: "y axis" }
         ]
     };
 
diff --git a/src/mode/cam/driver.js b/src/mode/cam/driver.js
index c96e1c4d..9f35544f 100644
--- a/src/mode/cam/driver.js
+++ b/src/mode/cam/driver.js
@@ -58,7 +58,8 @@
             let proc = settings.process;
             api.ui.camTabs.marker.style.display = proc.camTabsOn ? 'flex' : 'none';
             api.ui.camRough.marker.style.display = proc.camRoughOn ? 'flex' : 'none';
-            api.ui.camDrill.marker.style.display = proc.camDrillingOn ? 'flex' : 'none';
+            api.ui.camDrill.marker.style.display =
+                proc.camDrillingOn || proc.camDrillReg !== 'none' ? 'flex' : 'none';
             api.ui.camOutline.marker.style.display = proc.camOutlineOn ? 'flex' : 'none';
             api.ui.camContour.marker.style.display =
                 proc.camContourXOn || proc.camContourYOn ? 'flex' : 'none';
@@ -859,6 +860,7 @@
             procContourY = proc.camContourYOn && proc.camOutlinePlunge && contourToolDiam,
             procContour = procContourX || procContourY,
             procDrill = proc.camDrillingOn && proc.camDrillDown && proc.camDrillDownSpeed,
+            procDrillReg = proc.camDrillReg,
             procTrace = proc.camTraceOn,
             sliceDepth = Math.max(0.1, Math.min(proc.camRoughDown, proc.camOutlineDown) / 3) * units,
             pocketOnlyRough = proc.camRoughPocket,
@@ -892,7 +894,7 @@
             return ondone(`invalid slice depth (${sliceDepth.toFixed(2)} ${unitsName})`);
         }
 
-        if (!(procFacing || procRough || procOutline || procContour || procDrill)) {
+        if (!(procFacing || procRough || procOutline || procContour || procDrill || procDrillReg)) {
             return ondone("no processes selected");
         }
 
@@ -984,6 +986,10 @@
             // set all default shells
             const camShellPolys = shellRough = shellOutline = facePolys = camShell.gatherTopPolys([]);
 
+            if (procDrillReg) {
+                sliceDrillReg(settings, widget, sliceAll);
+            }
+
             if (procDrill) {
                 sliceDrill(settings, widget, slices, sliceAll);
             }
@@ -1147,6 +1153,41 @@
         });
     }
 
+    function sliceDrillReg(settings, widget, output) {
+        let proc = settings.process,
+            bounds = settings.bounds,
+            stock = settings.stock,
+            mx = (bounds.max.x + bounds.min.x) / 2,
+            my = (bounds.max.y + bounds.min.y) / 2,
+            dx = (stock.x - (bounds.max.x - bounds.min.x)) / 4,
+            dy = (stock.y - (bounds.max.y - bounds.min.y)) / 4,
+            dz = stock.z,
+            points = [];
+
+        switch(proc.camDrillReg) {
+            case "x axis":
+                points.push(newPoint(bounds.min.x - dx, my, 0));
+                points.push(newPoint(bounds.max.x + dx, my, 0));
+                break;
+            case "y axis":
+                points.push(newPoint(mx, bounds.min.y - dy, 0));
+                points.push(newPoint(mx, bounds.max.y + dy, 0));
+                break;
+        }
+
+        if (points.length) {
+            let slice = newSlice(0,null), polys = [];
+            points.forEach(point => {
+                polys.push(newPolygon()
+                    .append(point.clone().setZ(bounds.max.z))
+                    .append(point.clone().setZ(bounds.max.z - stock.z)));
+            });
+            slice.camMode = CPRO.DRILL;
+            slice.addTop(null).traces = polys;
+            output.append(slice);
+        }
+    }
+
     // runs in browser main
     function sliceRender(widget) {
         let slices = widget.slices;
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 58cc2921..501770d3 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -288,6 +288,8 @@ kiri.lang['en-us'] = {
     cd_dwll_l:      "dwell time\nbetween plunges in\nin milliseconds",
     cd_lift_s:      "drill lift",
     cd_lift_l:      "lift between plunges\nafter dwell period\nin workspace units\n0 to disable",
+    cd_regi_s:      "register",
+    cd_regi_l:      "drill registration holes\nfor double-sided parts\nindependent of enable\ndrilling but uses same\ntool and settings",
 
     // CNC CUTOUT TABS
     ct_menu:        "tabs",