Programming languages

Problem

You are trying to construct a cq.Location object using code like

cq.Location(1, 2, 3)

however when you run it, you see the following error message:

File ~\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\cadquery\occ_impl\geom.py:1011, in Location.__init__(self, *args)
   1008 else:
   1009     t, ax, angle = args
   1010     T.SetRotation(
-> 1011         gp_Ax1(Vector().toPnt(), Vector(ax).toDir()), angle * math.pi / 180.0
   1012     )
   1013     T.SetTranslationPart(Vector(t).wrapped)
   1015 self.wrapped = TopLoc_Location(T)

File ~\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\cadquery\occ_impl\geom.py:91, in Vector.__init__(self, *args)
     89         fV = gp_Vec(args[0])
     90     else:
---> 91         raise TypeError("Expected three floats, OCC gp_, or 3-tuple")
     92 elif len(args) == 0:
     93     fV = gp_Vec(0, 0, 0)

TypeError: Expected three floats, OCC gp_, or 3-tuple

Solution:

Don’t pass three separate parameters to cq.Location() – pass a tuple with three numbers by adding an additional set of braces:

cq.Location((1, 2, 3))

import cadquery as cq

obj = cq.Workplane("XY").box(1,1,3)
# Add chamfer to only the top face edges parallel to the X axis
obj = obj.faces("+Z").edges("|X").chamfer(0.8, 0.3)
obj

import cadquery as cq

obj = cq.Workplane("XY").box(1,1,3)
# Add chamfer to only the top face edges parallel to the X axis
obj = obj.faces("+Z").edges("|X").chamfer(0.2)
obj

import cadquery as cq

obj = cq.Workplane("XY").box(1,1,3)
# Add chamfer to all top face edges
obj = obj.faces("+Z").chamfer(0.2)
obj

This code chamfers the top side of a sketch rectangle, which is then extruded

import cadquery as cq

obj = (cq.Workplane("YZ")
    .sketch()
    .rect(1,4)
    # Select vertices to chamfer
    .vertices(">Y") # Top of local Y coordinate system (which is Z axis)
    .chamfer(0.2)
    .finalize()
    .extrude(0.1)
)
obj

This code creates a sketch from four segment lines forming a rectangle (given the four sets of X/Y coordinates). The segments are then assembled into a face and extruded.

import cadquery as cq

xstart = 1.0
height = 4.0
width = 1.0
obj = (cq.Workplane("YZ")
    .sketch()
    .segment((xstart, 0), (xstart, height))
    .segment((xstart + width, height))
    .segment((xstart + width, 0))
    .close()
    .assemble(tag="face")
    .finalize()
    .extrude(0.1)
)
obj

In order to move to a certain position in a CadQuery sketch, use .push(cq.Location(...))

Full example

import cadquery as cq

# Create workplane (2d coordinate system for us to create the sketch in)
wp = cq.Workplane("XY")
# Create sketch
result = wp.sketch().push(cq.Location((1,0.5,0))).rect(1,1).finalize().extrude(0.1)

result # This line is just to show the result in cq-editor or jupyter

This example generates a 2x2 grid of 1x1mm rectangles in a sketch, then extrudes it

import cadquery as cq

# Create workplane (2d coordinate system for us to create the sketch in)
wp = cq.Workplane("XY")
# Create sketch & extrude
result = wp.sketch().rarray(
    1.5, # X distance between center points of rectangles
    1.5, # Y distance between center points of rectangles
    2, # Number of rectangles in X direction
    2 # Number of rectangles in Y direction
).rect(1,1).finalize().extrude(0.1)

result # This line is just to show the result in cq-editor or jupyter

In our previous example CadQuery minimal sketch extrude example we showed how to create and extrude a simple sketch.

You can translate this easily using

result = result.translate(cq.Vector(1,0,0))

Full example

import cadquery as cq

# Create workplane (2d coordinate system for us to create the sketch in)
wp = cq.Workplane("XY")
# Create sketch, create rect, close sketch and extrude the resulting face
result = wp.sketch().rect(2, 2).finalize().extrude(0.1)
result = result.translate(cq.Vector(1,0,0))

result # This line is just to show the result in cq-editor or jupyter

The folllowing example creates a sketch in the XY plane, creates a 2x2mm rectangle in said sketch and extrudes it to a height of 0.1mm.

import cadquery as cq

# Create workplane (2d coordinate system for us to create the sketch in)
wp = cq.Workplane("XY")
# Create sketch, create rect, close sketch and extrude the resulting face
result = wp.sketch().rect(2, 2).finalize().extrude(0.1)

result # This line is just to show the result in cq-editor or jupyter

import cadquery as cq

# Define dimensions
base_length = 200  # 20cm
base_width = 80    # 8cm
plate_thickness = 2  # 2mm
upright_height = 400  # 40cm

# Create the base plate
base_plate = cq.Workplane("XY").box(base_length, base_width, plate_thickness)

# Create the upright plate
# Position is set such that it aligns with the end of the base plate and stands upright
upright_plate = cq.Workplane("XY").workplane(offset=plate_thickness).transformed(rotate=(0, 90, 0)).box(upright_height, base_width, plate_thickness).translate((base_length/2, 0, upright_height/2))

# Join the two parts into one
final_part = base_plate.union(upright_plate)

# Export to STEP
final_part.val().exportStep("L-piece.stp")