How to reset plane / coordinate system to that of a previous state?

[velle]

I tag the previous state, and then I set the plane with:

box.plane = box.workplaneFromTagged('base').plane

It works, but I have a feeling that there must be a more elegant way. How would one normally do this?

Complete code sample below:

import cadquery as cq

wp = cq.Workplane("XY")
wp.tag('base')

box = wp.workplane()
box = box.workplane().box(40, 40, 30)

box = box.faces('>Z').edges('|X').fillet(3)

# drill mounting holes
box = box.faces('>Z').workplane().pushPoints([
    (-10, 0), 
    ( 10, 0),
]).cboreHole(3.2, 6.2, 4.2)

# drill bearing hole
box.plane = box.workplaneFromTagged('base').plane
box = box.faces('>Y').workplane().hole(10)

[lorenzncode]

Try centerOption="CenterOfMass" when creating the Workplane on a face.

import cadquery as cq

box1 = cq.Workplane().box(40, 40, 30)

# drill mounting holes
box1 = (
    box1.faces(">Z")
    .workplane()
    .pushPoints(
        [
            (-10, 0),
            (10, 0),
        ]
    )
    .cboreHole(3.2, 6.2, 4.2)
)

# drill bearing hole
box1 = box1.faces(">Y").workplane(centerOption="CenterOfMass").hole(10)

box1 = box1.faces(">Z").edges("|X").fillet(3)

Here is an example that locates the hole relative to the corner vertex:

import cadquery as cq

box1 = cq.Workplane().box(40, 40, 30)

# drill mounting holes
box1 = (
    box1.faces(">Z")
    .workplane()
    .pushPoints(
        [
            (-10, 0),
            (10, 0),
        ]
    )
    .cboreHole(3.2, 6.2, 4.2)
)

# drill bearing hole
sk1 = cq.Sketch().push([(20, 15)]).circle(5)

# hole is referenced from selected vertex
box1 = (
    box1.faces("<Y")
    .vertices("<XZ")
    .workplane(centerOption="CenterOfMass")
    .placeSketch(sk1)
    # .placeSketch(sk1.moved(x=20, y=15))  # or with latest branch can use moved with x, y instead of push
    .cutThruAll()
)

box1 = box1.faces(">Z").edges("|X").fillet(3)

See also:
https://cadquery.readthedocs.io/en/latest/examples.html#creating-workplanes-on-faces
https://cadquery.readthedocs.io/en/latest/examples.html#locating-a-workplane-on-a-vertex