From fa313ef0b2f106109b91e9fbf5ab76304f857244 Mon Sep 17 00:00:00 2001
From: Christian Colglazier <christian@cacolglazier.com>
Date: Tue, 17 May 2022 14:44:49 -0400
Subject: [PATCH] Curved follow focus

---
 follow_focus.py | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/follow_focus.py b/follow_focus.py
index 4e45da5..e956b6b 100644
--- a/follow_focus.py
+++ b/follow_focus.py
@@ -1,13 +1,23 @@
 import cadquery as cq
 
+import math
+
 slant_degree=15.0
 thickness=20
+rod_thickness=15.2
+loop_thickness=1.5
 stepper_motor_size=42
 offset=8.83
 
-base = cq.Workplane('XY').lineTo(0,offset).polarLine(42 ,90-slant_degree).hLine(43.4816).polarLine(45,270-slant_degree).polarLine(10,-(90-2*slant_degree))
+gap = stepper_motor_size * math.sin(math.radians(slant_degree)) / math.sin(math.radians(90-slant_degree))
+width = math.sqrt(gap**2 + stepper_motor_size**2 - 2*gap*stepper_motor_size*math.cos(math.radians(90)))
+base = cq.Workplane('XY').lineTo(0,offset).polarLine(stepper_motor_size, 90-slant_degree)
+base = base.hLine(width).polarLine(stepper_motor_size-2,270-slant_degree).tangentArcPoint((6,-11))
 base = base.threePointArc((50,-20), (25, -30)).polarLine(10, 180-slant_degree).vLine(10).polarLine(12.5, -slant_degree)
-base = base.threePointArc((35, -20), (25, 0)).polarLine(10, 180-slant_degree).close().extrude(20)
+base = base.threePointArc((35, -20), (25, 0)).polarLine(10, 180-slant_degree)
+base = base.close().extrude(20)
 
 # Render
 show_object(base)
+
+