[Python] I'm trying to model a bolt in CadQuery python

I'm trying to build a CAD model of a bolt, but I can't figure out how to cut off the tops of the corners at the top of the head at a 45-degree angle.

I want to get this result



What did I do for this?

At first I tried this:

import cadquery as cq
from math import sqrt, tan, radians


head_diameter = 10.0
head_height = 5.0
shaft_diameter = 5.0
shaft_length = 20.0


R = head_diameter / 2
r = R * sqrt(3)/2
chamfer_size = (R - r) / tan(45)

bolt_head = (
cq.Workplane("XY")
.polygon(6, 2*R)
.extrude(head_height)
.translate((0, 0, -1 * (head_height/2)))
)

bolt_head = bolt_head.edges("Z").chamfer(1)

bolt_shaft = (
cq.Workplane("XY")
.circle(shaft_diameter/2)
.extrude(-shaft_length)
)

bolt = bolt_head.union(bolt_shaft)


This code generates the following CAD:

Then so:

import cadquery as cq
from math import sqrt, tan, radians


HEAD_DIAMETER = 20.0
HEAD_HEIGHT = 10.0
CUT_ANGLE = 45.0
SHAFT_DIAMETER = 8.0
SHAFT_LENGTH = 30.0


R = HEAD_DIAMETER / 2
r = R * sqrt(3)/2
cut_depth = (R - r) / tan(radians(CUT_ANGLE))


hexagon = (
cq.Workplane("XY")
.polygon(6, HEAD_DIAMETER)
.extrude(HEAD_HEIGHT + cut_depth)
)


cutter = (
cq.Workplane("XY")
.workplane(offset=HEAD_HEIGHT)
.circle(r)
.workplane(offset=cut_depth)
.circle(R * 1.1)
.loft(combine=True)
)


result = hexagon.cut(cutter)


result = (
result.faces(">Z")
.workplane(centerOption="CenterOfMass")
.circle(r)
.cutBlind(-cut_depth)
)


show_object(result)


But it outputs an error:

ValueError: If multiple objects selected, they all must be planar faces.


This code generates the following CAD:

Does anyone know how to cut off the upper parts of the corners of the bolt head at a 45 degree angle?

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