Follow focus ring

.gitignore

@@ -152,3 +152,5 @@ cython_debug/
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
 
+# CAD Models
+*.stl

follow_focus_ring.py

@@ -0,0 +1,25 @@
+import math
+
+import cadquery as cq
+from cq_gears import SpurGear
+
+# User Settings
+lens_ring_diameter=100.0
+lens_name=''
+follow_focus_width=10.0
+
+# Constants
+follow_focus_mod=0.8
+follow_focus_inner_thickness=5.0
+follow_focus_num_teeth=int(math.ceil((follow_focus_inner_thickness+lens_ring_diameter)/follow_focus_mod))
+
+# Create follow focus ring
+ring = SpurGear(module=follow_focus_mod, teeth_number=follow_focus_num_teeth,\
+                     width=follow_focus_width, bore_d=lens_ring_diameter)
+
+# Render
+wp = cq.Workplane('XY').gear(ring)
+show_object(wp)
+
+# Export STL
+cq.exporters.export(wp, 'follow_focus_ring{}.stl'.format(lens_name))