From 967755f7b1846ea8f3586a094fcb41005bc1f479 Mon Sep 17 00:00:00 2001
From: Christian Colglazier <christian@cacolglazier.com>
Date: Thu, 26 May 2022 19:06:38 -0400
Subject: [PATCH] Bore hole

---
 follow_focus.py | 38 ++++++++++++++++++++++++++++++++++----
 1 file changed, 34 insertions(+), 4 deletions(-)

diff --git a/follow_focus.py b/follow_focus.py
index 8f3ca32..6404e72 100644
--- a/follow_focus.py
+++ b/follow_focus.py
@@ -120,6 +120,36 @@ def createOutline(ex_amount):
     base = base.edges('|Z').edges('<<Y[-2]').fillet(5)
     return base
 
+# Based on https://github.com/gumyr/cq_warehouse/issues/42 from jdegs
+def boreHole(caph_diam, caph_dep, step_dep, thd_diam, thd_dep):
+    
+    s_p0 = ( #cap head circle
+        cq.Sketch()
+        .circle(caph_diam/2)
+        )
+    
+    s_p1 = ( #rect slot with circular cut-ends
+        cq.Sketch()
+        .circle(caph_diam/2)
+        .rect(caph_diam,thd_diam,mode='i')
+        )
+    
+    s_p2 = ( #thread circle
+        cq.Sketch()
+        .circle(thd_diam/2)
+        )
+    
+    f_fancyh = ( #assemble components
+        cq.Workplane()
+        .placeSketch(s_p0)
+        .extrude(caph_dep).faces(">Z").workplane()
+        .placeSketch(s_p1)
+        .extrude(step_dep).faces(">Z").workplane()
+        .placeSketch(s_p2)
+        .extrude(thd_dep)
+        )
+    return f_fancyh.rotate((1,0,0),(0,0,0),180)
+
 lid = createOutline(-lid_thicknesss).translate((0,0,part_thinkness))
 base = createOutline(part_thinkness)
 
@@ -208,12 +238,12 @@ lid = lid.faces('>Z[0]').workplane().circle(2).cutThruAll()
 lid = lid.faces('<Z[0]').workplane().circle(m3_head_diameter/2).cutBlind(-m3_head_depth)
 
 # Lid Holes
-lid = lid.faces('<Z[0]').workplane().center(-stepper_motor_size+wall_width,-stepper_motor_size+offset/2-loop_width)\
-                                    .circle(m3_passthrough/2).cutThruAll()
-drill = lid.faces('<Z[0]').workplane().circle(m3_tap/2)\
+c = lid.faces('<Z[0]').workplane().center(-stepper_motor_size+wall_width,-stepper_motor_size+offset/2-loop_width).val()
+drill = lid.faces('<Z[0]').workplane().center(-stepper_motor_size+wall_width,-stepper_motor_size+offset/2-loop_width).circle(m3_tap/2)\
                                       .extrude(-part_thinkness+wall_width, combine=False)
+cut = boreHole(m3_head_diameter, m3_head_depth, 0.4, m3_passthrough, m3_passthrough).translate(c)
 base = base.cut(drill)
-lid = lid.faces('<Z[0]').workplane().circle(m3_head_diameter/2).cutBlind(-m3_head_depth)
+lid = lid.cut(cut)
 
 # Gears
 l_gear = cq.Workplane('XY').gear(SpurGear(module=mod,