2040 for slider

follow_focus.py

@@ -1,25 +1,286 @@
 import cadquery as cq
+from cq_gears import SpurGear
 
 import math
 
-slant_degree=15.0
-thickness=20
-rod_thickness=15.2
-loop_thickness=1.5
-stepper_motor_size=42
-offset=8.83
+from shapely.geometry import LineString
+from shapely.geometry import Point
 
+# M3 screws for attaching lid
+m3_tap=              2.5
+m3_head_diameter=    6
+m3_head_depth=       3
+m3_passthrough=      3.5
+
+# Fastener dimensions
+fastener_width=      11.5
+fastener_height=     3.5
+fastener_length=     20
+fastener_h_spacing=  .2
+fastener_gap=        .2
+hex_diameter=        10
+hex_depth=           4
+m5_passthrough=      5.5
+
+# NEMA 17 stepper motor
+stepper_motor_size=  42.0
+stepper_hole_width=  31.0
+stepper_mount_dia=   22.5
+
+# Case
+part_thinkness=      20
+outer_fillets=       2.5
+slant_degree=        15.0
+wall_width=          1.6
+loop_width=          wall_width
+loop_angle=          36
+rod_diameter=        15.2
+offset=              9
+tab_height=          6
+tab_width=           25
+lid_stepper_hole=    5.5
+
+# Gears
+mod=                 0.8
+gear_gap=            0.2
+gear_offset=         0.2
+large_gear_diameter= 8.5
+gear_thinkness=      10
+sg_teeth=            11
+
+# Other
+mount_gap=           2
+support_radius=      11/2
+end_y=               -4.3
+step_dep=            0.4
+hack_num=            0.000001             
+
+# Calculated values
+fastener_hole_depth = tab_height-2
+lid_thicknesss = (part_thinkness-gear_thinkness)/2
 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-5,270-slant_degree).tangentArcPoint((gap+stepper_motor_size-5,0), relative=False)
+end_x = gap+stepper_motor_size-5
+outer_ring_diameter = rod_diameter+2*loop_width
+center_x = end_x-math.cos(math.radians(loop_angle))*outer_ring_diameter/2
+center_y = end_y-math.sin(math.radians(loop_angle))*outer_ring_diameter/2
+# Stepper motor mount points
+stepper_hole_radius = stepper_hole_width/2*math.sqrt(2)
+stepper_center = cq.Workplane('XY').lineTo(0, offset)\
+                                   .polarLine(stepper_motor_size/2, 90-slant_degree)\
+                                   .polarLine(stepper_motor_size/2, -slant_degree)\
+                                   .val().endPoint().toTuple()
 
-#base = base.threePointArc((60,(-rod_thickness-2*loop_thickness)/2), (40, -rod_thickness-2*loop_thickness)).polarLine(10, 180-slant_degree).vLine(10).polarLine(12.5, -slant_degree)
-base = base.threePointArc((55,-20), (25, -30)).polarLine(15, 180-slant_degree).vLine(8).polarLine(15.5, -slant_degree)
-base = base.threePointArc((45, -10), (25, -20)).polarLine(15, 180-slant_degree)
-base = base.close().extrude(20)
+e = cq.Workplane('XY').lineTo(0,offset).polarLine(stepper_motor_size, 90-slant_degree).hLine(width)
+end = e.val().endPoint().toTuple()
+e = e.polarLine(support_radius,180-slant_degree).val().endPoint().toTuple()
+slope = math.tan(math.radians(90-slant_degree))
+b = e[1] - slope*e[0]
+support_y = end[1]-support_radius
+support_x = (support_y-b)/slope
+
+lg_x = support_x-stepper_center[0]
+lg_y = support_y-stepper_center[1]
+sg_radius = sg_teeth*mod/2
+lg_radius = (math.sqrt(lg_x**2 + lg_y**2)-sg_radius)
+
+def findRodInter(n_x, n_y):
+    p = Point(center_x, center_y)
+    c = p.buffer(rod_diameter/2).boundary
+    l = LineString([(n_x, n_y), (n_x+100*math.cos(math.radians(-slant_degree)), n_y+100*math.sin(math.radians(-slant_degree)))])
+    i = c.intersection(l)
+
+    if len(i.geoms) > 1 and i.geoms[0].coords[0][0] > i.geoms[1].coords[0][0]:
+        x = i.geoms[1].coords[0][0]
+        y = i.geoms[1].coords[0][1]
+    else:
+        x = i.geoms[0].coords[0][0]
+        y = i.geoms[0].coords[0][1]
+    return x, y
+
+def createOutline(ex_amount):
+    base = cq.Workplane('XY').lineTo(0,offset).polarLine(stepper_motor_size, 90-slant_degree)
+    base = base.hLine(width).polarLine(stepper_motor_size-5,270-slant_degree).tangentArcPoint((end_x, end_y), relative=False)
+
+    outer_x=center_x+math.cos(math.radians(270-slant_degree))*outer_ring_diameter/2
+    outer_y=center_y+math.sin(math.radians(270-slant_degree))*outer_ring_diameter/2
+    base = base.threePointArc((center_x+outer_ring_diameter/2 ,center_y), (outer_x, outer_y))\
+               .polarLine(tab_width, 180-slant_degree).vLine(tab_height)
+
+    n_x=base.val().endPoint().toTuple()[0]
+    n_y=base.val().endPoint().toTuple()[1]
+    coor_x, coor_y = findRodInter(n_x, n_y)
+    last_x, last_y = findRodInter(n_x, n_y+mount_gap)
+
+    base = base.lineTo(coor_x, coor_y)
+    base = base.threePointArc((center_x+rod_diameter/2, center_y), (last_x, last_y))
+    base = base.polarLine(tab_width, 180-slant_degree).close().extrude(ex_amount)
+
+    # Fillets
+    base = base.edges('|Z and >Y').fillet(outer_fillets)
+    base = base.edges('|Z and <X').fillet(outer_fillets)
+    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)
+
+# Shell
+copy = base.faces('>>Z[0]').workplane().center(0, -offset-loop_width)\
+                                       .polarLine(stepper_motor_size, slant_degree)\
+                                       .polarLine(-2*stepper_motor_size, 90+slant_degree)\
+                                       .hLine(-2*stepper_motor_size).close().cutThruAll()
+
+copy = copy.faces('+Z').workplane().center(0, -offset-loop_width)\
+                                   .polarLine(2*stepper_motor_size,-slant_degree)\
+                                   .vLine(stepper_motor_size)\
+                                   .hLine(-2*stepper_motor_size)\
+                                   .close().cutBlind(-lid_thicknesss)
+base = base.faces('+Z').shell(-wall_width)
+base = base.add(copy)
+base = base.faces('<<Z[0]').workplane().vLine(offset+loop_width, forConstruction=True)\
+                                       .polarLine(stepper_motor_size, -slant_degree)\
+                                       .polarLine(stepper_motor_size, -slant_degree-3.75)\
+                                       .vLine(2*stepper_motor_size)\
+                                       .hLine(-2*stepper_motor_size)\
+                                       .close().cutBlind(-lid_thicknesss)
+
+base = base.faces('>>Z[0]').workplane().center(stepper_center[0], -stepper_center[1])\
+                                       .circle(stepper_mount_dia/2)\
+                                       .pushPoints([(stepper_hole_radius*math.cos(math.radians(45+slant_degree)),\
+                                                     stepper_hole_radius*math.sin(math.radians(45+slant_degree))),\
+                                                    (stepper_hole_radius*math.cos(math.radians(135+slant_degree)),\
+                                                     stepper_hole_radius*math.sin(math.radians(135+slant_degree))),\
+                                                    (stepper_hole_radius*math.cos(math.radians(225+slant_degree)),\
+                                                     stepper_hole_radius*math.sin(math.radians(225+slant_degree))),\
+                                                    (stepper_hole_radius*math.cos(math.radians(315+slant_degree)),\
+                                                     stepper_hole_radius*math.sin(math.radians(315+slant_degree)))])\
+                                       .circle(3/2).cutBlind(-wall_width)
+
+lid = lid.cut(base)
+copy = lid.faces('>>Z[0]').workplane().vLine(-offset-wall_width, forConstruction=True).polarLine(stepper_motor_size*2, slant_degree)\
+                                      .polarLine(-2*stepper_motor_size, 90+slant_degree)\
+                                      .hLine(-3*stepper_motor_size).close().cutThruAll()
+lid = lid.faces('>Z[0]').shell(-wall_width+hack_num, kind='arc')
+lid = lid.add(copy)
+
+lid = lid.faces('>Z[1]').workplane().center(stepper_center[0], -stepper_center[1])\
+                                    .circle(sg_radius+mod).extrude(lid_thicknesss-wall_width)
+lid = lid.faces('>Z[0]').workplane().circle(lid_stepper_hole/2).cutThruAll()
+
+base = base.faces('<Z[1]').workplane().center(lg_x, lg_y).circle(lg_radius+2*mod).cutBlind(-gear_thinkness-gear_gap)
+base = base.faces('<Z[2]').workplane().circle(support_radius).extrude(-lid_thicknesss+wall_width)
+base = base.faces('<Z[2]').workplane().vLine(support_radius-wall_width/2)\
+                                      .hLine(support_radius)\
+                                      .polarLine(support_radius, 270-slant_degree)\
+                                      .close().extrude(-lid_thicknesss+wall_width)
+base = base.faces('<Z[2]').workplane().circle(large_gear_diameter/2-gear_offset).extrude(gear_thinkness/2)
+base = base.faces('<Z[2]').workplane().circle(m3_tap/2).cutBlind(-part_thinkness/2+wall_width)
+
+# Threaded insert
+base = base.faces('<<Y[-1]').workplane().center(-5,0).circle(6.5/2).cutBlind(-support_radius-mount_gap*2-6)
+base = base.faces('<<Y[-1]').workplane().circle(8.5/2).cutBlind(-support_radius-mount_gap)
+
+# Fastener
+base = base.faces('<<Y[-1]').workplane().circle(fastener_width/2+fastener_gap).cutBlind(-fastener_hole_depth)
+fastener = base.faces('<<Y[-4]').workplane().circle(fastener_width/2)\
+                                            .extrude(fastener_hole_depth+fastener_h_spacing+fastener_height, combine=False)
+
+fastener = fastener.faces('<<Y[-1]').workplane().center(-fastener_length,0)\
+                                                .vLine(-fastener_width/18)\
+                                                .lineTo(fastener_length,-fastener_width/2)\
+                                                .vLine(fastener_width)\
+                                                .lineTo(0,fastener_width/18)\
+                                                .close().extrude(-fastener_height)
+fastener = fastener.faces('<<Y[-1]').workplane().circle(fastener_width/6).extrude(-fastener_height)
+fastener = fastener.faces('<<Y[-1]').center(fastener_length,0)\
+                                    .sketch().regularPolygon(hex_diameter/2,6)\
+                                             .finalize().cutBlind(-hex_depth)
+
+fastener = fastener.faces('<<Y[-6]').workplane().circle(m5_passthrough/2).cutThruAll()
+fastener = fastener.faces('<<Y[-6]').workplane().rect(hex_diameter,hex_diameter/2).cutBlind(-step_dep)
+
+# Lid large gear mount point
+lid = lid.faces('>Z[0]').workplane().center(lg_x+hack_num,-lg_y)\
+                                    .circle(support_radius).extrude(-lid_thicknesss+wall_width)
+lid = lid.faces('>Z[0]').workplane().center(-hack_num, 0).vLine(-support_radius+wall_width/2)\
+                                                       .hLine(support_radius)\
+                                                       .polarLine(-support_radius, 270+slant_degree)\
+                                                       .close().extrude(-lid_thicknesss+wall_width)
+
+# Lid Holes
+lid = lid.faces('>Z[0]').workplane().circle(large_gear_diameter/2-gear_offset).extrude(gear_thinkness/2)
+cut = boreHole(m3_head_diameter, m3_head_depth, step_dep, m3_passthrough, m3_passthrough*2).translate(lid.faces('<Z[0]').workplane().val())
+lid = lid.cut(cut)
+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, step_dep, m3_passthrough, m3_passthrough).translate(c)
+base = base.cut(drill)
+lid = lid.cut(cut)
+
+# Gears
+l_gear = cq.Workplane('XY').gear(SpurGear(module=mod,
+                                          teeth_number=math.ceil(lg_radius*2/mod),
+                                          width=gear_thinkness,
+                                          bore_d=large_gear_diameter))
+l_gear = l_gear.translate((lg_x+stepper_center[0], lg_y+stepper_center[1], (gear_thinkness-gear_gap)/2))
+s_gear = cq.Workplane('XY').gear(SpurGear(module=mod,
+                                          teeth_number=sg_teeth,
+                                          width=gear_thinkness))
+
+
+# Stepper motor mount point
+tab_distance = 4
+shaft_diameter = 5
+cut = cq.Workplane('XY').circle(shaft_diameter/2).extrude(gear_thinkness)
+cut = cut.workplane().vLine(2*tab_distance, forConstruction=True).rect(shaft_diameter,tab_distance).cutThruAll()
+s_gear = s_gear.cut(cut)
+s_gear = s_gear.translate((stepper_center[0],stepper_center[1],(gear_thinkness-gear_offset)/2))
 
 # Render
-show_object(base)
-
+show_object(base, name='Follow Focus Base', options={"color": (10, 10, 10)})
+show_object(lid, name='Follow Focus Lid', options={"color": (10, 10, 10)})
+show_object(fastener, name='Follow Focus Fastener', options={"color": (10, 10, 10)})
+show_object(l_gear, name='Follow Focus Large Gear', options={"color": (10, 10, 10)})
+show_object(s_gear, name='Follow Focus Small Gear', options={"color": (10, 10, 10)})
 
+# Export STL
+fastener = fastener.rotateAboutCenter((1,0,0), 90).rotateAboutCenter((0,1,0), -slant_degree)
+lid = lid.rotateAboutCenter((1,0,0), 180).rotateAboutCenter((0,0,1), -slant_degree)
+base = base.rotateAboutCenter((0,0,1), slant_degree)
+cq.exporters.export(base, 'follow-focus-base.stl')
+cq.exporters.export(lid, 'follow-focus-lid.stl')
+cq.exporters.export(fastener, 'follow-focus-fastener.stl')
+cq.exporters.export(l_gear, 'follow-focus-large_gear.stl')
+cq.exporters.export(s_gear, 'follow-focus-small_gear.stl')

requirements.txt

@@ -1 +1,3 @@
 git+https://github.com/meadiode/cq_gears.git@main
+git+https://github.com/gumyr/cq_warehouse.git#egg=cq_warehouse
+shapely

slider.py

@@ -0,0 +1,25 @@
+import cadquery as cq
+from cadquery import exporters
+
+slider_length=700
+slider_width=50
+
+path='20-2040.dxf'
+
+bar_l = (
+    cq.importers.importDXF(path)
+    .wires().toPending()
+    .extrude(slider_length)
+    .translate((0, -slider_width/2, 0))
+)
+
+bar_r = (
+    cq.importers.importDXF(path)
+    .wires().toPending()
+    .extrude(slider_length)
+    .translate((0, slider_width/2, 0))
+)
+
+# Render
+show_object(bar_l, name='Left Bar', options={"color": (20, 20, 20)})
+show_object(bar_r, name='Right Bar', options={"color": (20, 20, 20)})