import cadquery as cq import numpy as np from cadquery import exporters import os # Modifiable parameters height = 4 # mm, minimum is 0.8 chamferSize = 0.8 # mm thickness = 4.0 # mm # Recommend fullWidth/numMeasPoints does not fall below 40 fullWidth = 120 # mm numMeasPoints = 3 diagWidth = 15 # adjustment at the corners to account for potentially # uncalibrated pressure advance pa = 0.8 # make chamfers? fightElephantFoot = True # The rest is all automated sep = fullWidth/(numMeasPoints*2) halfWidth = fullWidth/2 def thickLine(x0, x1, y0, y1, height = height, thickness = thickness, wp = cq.Workplane(), chamferStart = True, chamferEnd = True): dx = x1 - x0 dy = y1 - y0 xbar = (x0+x1)/2 ybar = (y0+y1)/2 theta = np.arctan2(dy, dx) print(theta) L = np.sqrt(dx**2 + dy**2) line = (wp.center(0,0) .rect(L, thickness).extrude(height) ) if chamferStart: line = line.faces("-X").edges("|Z").chamfer(chamferSize) if chamferEnd: line = line.faces("+X").edges("|Z").chamfer(chamferSize) return (line.rotate((0,0,0),(0,0,1), theta*180/np.pi) .translate((xbar,ybar,0)) ) def paWedge(sideLength = chamferSize, mirrorX = False, mirrorY = False, wp = cq.Workplane(), height = height*2): wedge = (wp.moveTo(0,0) .lineTo(0,sideLength) .lineTo(sideLength,0) .close().extrude(height) ) if mirrorX: # negate x coords wedge = wedge.mirror((1,0,0),(0,0,0)) if mirrorY: # negate y coords wedge = wedge.mirror((0,1,0),(0,0,0)) return wedge # Center line result = thickLine(0, 0, -fullWidth/2 - thickness, fullWidth/2+thickness) # left and right lines, top and bottom result += thickLine(-sep + thickness/2, -sep + thickness/2, sep - thickness, fullWidth/2) result += thickLine(-sep + thickness/2, -sep + thickness/2, -sep + thickness, -fullWidth/2) result += thickLine(sep - thickness/2, sep - thickness/2, sep - thickness, fullWidth/2+thickness) result += thickLine(sep - thickness/2, sep - thickness/2, 0, -fullWidth/2-thickness) caliperStops = cq.Workplane() # Draw all vertical pieces first for ii in range(numMeasPoints): # Basic frame result += thickLine(-(ii+1)*sep + thickness/2, -(ii+1)*sep + thickness/2, -sep, 0) # Exterior caliper stops result += thickLine(-(ii+1)*sep -thickness/2, -(ii+1)*sep -thickness/2, -thickness,sep) result += thickLine((ii+1)*sep + thickness/2, (ii+1)*sep + thickness/2, -thickness,sep) result += thickLine((ii+1)*sep - thickness/2, (ii+1)*sep -thickness/2, -sep, 0) # Interior caliper stops caliperStops += thickLine((ii+1)*sep - thickness*2/3 - pa*2, (ii+1)*sep + thickness/2, sep/2 + thickness/4, sep/2 + thickness/4) caliperStops += thickLine(-(ii+1)*sep + thickness*2/3 + 2*pa, -(ii+1)*sep - thickness/2, sep/2-3*thickness/4, sep/2-3*thickness/4) # up til now everything has been vertical # rotate and mirror to make the horizontal measure points result += (result.rotate((0,0,0),(0,0,1),-90) .mirror((0,1,0),(0,0,0))) # Caliper stops shouldn't be mirrored caliperStops += (caliperStops. rotate((0,0,0),(0,0,1),-90)) result += caliperStops # Cutouts to account for potentially poorly or non calibrated PA paCuts = cq.Workplane() for ii in range(numMeasPoints): paCuts += (paWedge(mirrorY = True) .translate((-(ii+1)*sep, sep/2 - thickness/4, 0))) paCuts += (paWedge(mirrorX = True) .translate(((ii+1)*sep, sep/2 - thickness/4, 0))) paCuts += (paWedge() .translate((sep/2 - thickness/4, -(ii+1)*sep, 0))) paCuts += (paWedge(mirrorX = True,mirrorY=True) .translate((sep/2 - thickness/4, (ii+1)*sep, 0))) result = result.cut(paCuts) # diagonal caliper stops diag = thickLine(0,0, 0, fullWidth/2+thickness) diag += thickLine(-diagWidth, -diagWidth, 0, fullWidth/2) # Top left for ii in range(numMeasPoints - 1): diag += thickLine(-diagWidth, 0, (ii+2)*sep - thickness/2, (ii+2)*sep - thickness/2) diag -= (paWedge() .translate((-thickness/2, (ii+2)*sep, 0))) #diag = diag.cut(cq.Workplane().circle(pa).extrude(height).translate((-thickness/2,sep*(ii+2) + pa,0))) # Other four corners diag += diag.mirror((0,1,0), (0,0,0)) diag += diag.rotate((0,0,0), (0,0,1), 90) # rotate the whole thing and cut out the central frame diag = diag.rotate((0,0,0),(0,0,1),45) diag -= (thickLine(0,0,-fullWidth/2 - thickness,fullWidth/2 + thickness, thickness = sep*2) + thickLine(-fullWidth/2,fullWidth/2, 0, 0, thickness = sep*2)) result += diag # Center circle that indicates orientation center = (cq.Workplane() .lineTo(0,sep/3) .threePointArc((-sep/3,0),(sep/3,0)) .close().extrude(height)) if fightElephantFoot: result = result.faces("+Z").chamfer(0.4,0.4) result = result.faces("-Z").chamfer(0.4,0.4) center = center.faces("+Z").chamfer(0.4,0.4) center = center.faces("-Z").chamfer(0.4,0.4) result += center result -= ((cq.Workplane() .lineTo(0,thickness/2) .threePointArc((-thickness/2,0), (thickness/2,0)) .close().extrude(height).translate((0,0,height-1)))) # If this line is causing issues, you can comment it out # (it's only valid if you're using CQ-editor try: show_object(result) except: # must be running from an environment other than cq-editor pass wd = os.getcwd() exporters.export(result, f'{wd}/calistar_{fullWidth}x{numMeasPoints}.stl') exporters.export(result, f'{wd}/calistar_{fullWidth}x{numMeasPoints}.step')