steve/v-slot-extrusion

20 x 20 V-slot aluminium extrusion, any length, measured from the published FreeCAD-library model.

v1.0.0 Latest STEVE MIT 0

Open in STEVE

Isometric

Parameters

Preset12 sizes

Length5–3000 mm

Anodising

clearblack

Defaults built

part.py 65 lines · Python · STEVE runtime · checked

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"""20 x 20 V-slot aluminium extrusion, any length.

The section, centred on the origin in the XY plane, extruded along +Z by `length`: a 20 x 20 square with 0.5 mm corner

radii and a V-slot in each face. Each slot: a 45 degree V from the face opening down to the lip tips, the lips' flat

undersides, the undercut's straight walls, 45 degree walls down to the core and the core's small V notch; a 4.2 mm

centre bore. All four slots are the same, turned 90 degrees.

Geometry measured from the published FreeCAD-library model "2020x50_V_slot_profile-Part.step" (hasecilu, CC-BY-3.0);

there is no manufacturer drawing. See the README.

"""

import math

from steve import Model

length = 100 # mm Length

finish = "clear" # Anodising

# mm, measured on the reference model's cross-section at mid-length (OCCT section, edges read exactly; the model's

# own values are given to 0.05 mm, the 45 degree walls' ends to 1e-4 mm). x across the top slot from its centre line,

# y up from the profile's centre.

SECTION = {

"outer": 20.0, # outside, square

"corner_r": 0.5, # outside corner radius

"opening": 9.7, # slot width at the face (x = +-4.85)

"tip": 6.1, # between the lip tips (x = +-3.05), 1.8 below the face: the V is 45 degrees

"lip_y": 8.2, # lip underside (flat, out to the undercut wall)

"undercut": 11.0, # undercut width (walls at x = +-5.5)

"wall_y": 6.5607, # where the undercut wall turns into the 45 degree wall

"floor": 5.6786, # core face width at y = core_y (x = +-2.8393)

"core_y": 3.9, # core face

"notch": 0.4, # V notch in the core face, 0.2 deep

"notch_depth": 0.2,

"bore": 4.2, # centre bore

}

FINISHES = {"clear": "#cfd2d6", "black": "#2b2c2e"}

s = SECTION

half = s["outer"] / 2

rc = s["corner_r"]

# one slot, the top one, left to right (the outline runs clockwise: top face, then right face, ...)

slot = [(-s["opening"] / 2, half), (-s["tip"] / 2, s["lip_y"]), (-s["undercut"] / 2, s["lip_y"]),

(-s["undercut"] / 2, s["wall_y"]), (-s["floor"] / 2, s["core_y"]), (-s["notch"] / 2, s["core_y"]),

(0.0, s["core_y"] - s["notch_depth"]), (s["notch"] / 2, s["core_y"]), (s["floor"] / 2, s["core_y"]),

(s["undercut"] / 2, s["wall_y"]), (s["undercut"] / 2, s["lip_y"]), (s["tip"] / 2, s["lip_y"]),

(s["opening"] / 2, half)]

def turn(points, quarter):

a = -math.pi / 2 * quarter

return [(x * math.cos(a) - y * math.sin(a), x * math.sin(a) + y * math.cos(a)) for x, y in points]

model = Model()

with model.sketch("section", on="XY", name="Section") as sk:

for q in range(4): # top, right, bottom, left side: the top one turned 90 degrees clockwise each time

pts = turn([(-half + rc, half)] + slot + [(half - rc, half)], q)

sk.polyline(f"side_{q}", pts, closed=False)

cx, cy = turn([(half - rc, half - rc)], q)[0]

start = 90 - 90 * q - 90

sk.arc(f"corner_{q}", (cx, cy), rc, start, start + 90)

sk.circle("bore", (0, 0), s["bore"] / 2)

model.extrude("profile", "section", distance=length, name="Profile")

model.material("aluminum-generic", color=FINISHES[finish]) # 6063-T5 typical (no STEVE entry for 6063)

result = model.result()

"""20 x 20 V-slot aluminium extrusion, any length.

The section, centred on the origin in the XY plane, extruded along +Z by `length`: a 20 x 20 square with 0.5 mm corner
radii and a V-slot in each face. Each slot: a 45 degree V from the face opening down to the lip tips, the lips' flat
undersides, the undercut's straight walls, 45 degree walls down to the core and the core's small V notch; a 4.2 mm
centre bore. All four slots are the same, turned 90 degrees.

Geometry measured from the published FreeCAD-library model "2020x50_V_slot_profile-Part.step" (hasecilu, CC-BY-3.0);
there is no manufacturer drawing. See the README.
"""
import math

from steve import Model

length = 100  # mm Length
finish = "clear"  # Anodising

# mm, measured on the reference model's cross-section at mid-length (OCCT section, edges read exactly; the model's
# own values are given to 0.05 mm, the 45 degree walls' ends to 1e-4 mm). x across the top slot from its centre line,
# y up from the profile's centre.
SECTION = {
    "outer": 20.0,           # outside, square
    "corner_r": 0.5,         # outside corner radius
    "opening": 9.7,          # slot width at the face (x = +-4.85)
    "tip": 6.1,              # between the lip tips (x = +-3.05), 1.8 below the face: the V is 45 degrees
    "lip_y": 8.2,            # lip underside (flat, out to the undercut wall)
    "undercut": 11.0,        # undercut width (walls at x = +-5.5)
    "wall_y": 6.5607,        # where the undercut wall turns into the 45 degree wall
    "floor": 5.6786,         # core face width at y = core_y (x = +-2.8393)
    "core_y": 3.9,           # core face
    "notch": 0.4,            # V notch in the core face, 0.2 deep
    "notch_depth": 0.2,
    "bore": 4.2,             # centre bore
}
FINISHES = {"clear": "#cfd2d6", "black": "#2b2c2e"}

s = SECTION
half = s["outer"] / 2
rc = s["corner_r"]
# one slot, the top one, left to right (the outline runs clockwise: top face, then right face, ...)
slot = [(-s["opening"] / 2, half), (-s["tip"] / 2, s["lip_y"]), (-s["undercut"] / 2, s["lip_y"]),
        (-s["undercut"] / 2, s["wall_y"]), (-s["floor"] / 2, s["core_y"]), (-s["notch"] / 2, s["core_y"]),
        (0.0, s["core_y"] - s["notch_depth"]), (s["notch"] / 2, s["core_y"]), (s["floor"] / 2, s["core_y"]),
        (s["undercut"] / 2, s["wall_y"]), (s["undercut"] / 2, s["lip_y"]), (s["tip"] / 2, s["lip_y"]),
        (s["opening"] / 2, half)]


def turn(points, quarter):
    a = -math.pi / 2 * quarter
    return [(x * math.cos(a) - y * math.sin(a), x * math.sin(a) + y * math.cos(a)) for x, y in points]


model = Model()
with model.sketch("section", on="XY", name="Section") as sk:
    for q in range(4):   # top, right, bottom, left side: the top one turned 90 degrees clockwise each time
        pts = turn([(-half + rc, half)] + slot + [(half - rc, half)], q)
        sk.polyline(f"side_{q}", pts, closed=False)
        cx, cy = turn([(half - rc, half - rc)], q)[0]
        start = 90 - 90 * q - 90
        sk.arc(f"corner_{q}", (cx, cy), rc, start, start + 90)
    sk.circle("bore", (0, 0), s["bore"] / 2)
model.extrude("profile", "section", distance=length, name="Profile")
model.material("aluminum-generic", color=FINISHES[finish])   # 6063-T5 typical (no STEVE entry for 6063)
result = model.result()

pypart.toml 111 lines · TOML

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name = "steve/v-slot-extrusion"

version = "1.0.0"

runtime = "steve"

license = "MIT"

summary = "20 x 20 V-slot aluminium extrusion, any length, measured from the published FreeCAD-library model."

description = """A 20 x 20 mm V-slot aluminium extrusion: a V-slot in each face (45 degree V down to the lips, flat lip \

undersides, the undercut, 45 degree walls to the core), 0.5 mm outside corner radii and a 4.2 mm centre bore, \

extruded to any length. The section was measured from the FreeCAD-library model 2020x50_V_slot_profile (CC-BY-3.0, \

by hasecilu); there is no manufacturer drawing.

Centred on the origin in the XY plane, extruded along +Z. Dimensions and attribution: see the README."""

tags = ["profile", "extrusion", "aluminium", "v-slot", "2020", "frame", "metric"]

[parameters.length]

type = "number"

default = 100

min = 5

max = 3000

unit = "mm"

label = "Length"

[parameters.finish]

type = "choice"

default = "clear"

choices = ["clear", "black"]

label = "Anodising"

[[presets]]

id = "V2020-50"

title = "V-slot 20 × 20, 50 mm"

params = { length = 50 }

aliases = ["2020 V-slot 50 mm", "V-slot 2020 50 mm", "20x20 V-slot 50", "2020 extrusion 50 mm", "V-slot 20x20x50", "2020 x 50 mm extrusion"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-100"

title = "V-slot 20 × 20, 100 mm"

params = { length = 100 }

aliases = ["2020 V-slot 100 mm", "V-slot 2020 100 mm", "20x20 V-slot 100", "2020 extrusion 100 mm", "V-slot 20x20x100"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-150"

title = "V-slot 20 × 20, 150 mm"

params = { length = 150 }

aliases = ["2020 V-slot 150 mm", "V-slot 2020 150 mm", "20x20 V-slot 150", "2020 extrusion 150 mm", "V-slot 20x20x150"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-200"

title = "V-slot 20 × 20, 200 mm"

params = { length = 200 }

aliases = ["2020 V-slot 200 mm", "V-slot 2020 200 mm", "20x20 V-slot 200", "2020 extrusion 200 mm", "V-slot 20x20x200"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-250"

title = "V-slot 20 × 20, 250 mm"

params = { length = 250 }

aliases = ["2020 V-slot 250 mm", "V-slot 2020 250 mm", "20x20 V-slot 250", "2020 extrusion 250 mm", "V-slot 20x20x250"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-300"

title = "V-slot 20 × 20, 300 mm"

params = { length = 300 }

aliases = ["2020 V-slot 300 mm", "V-slot 2020 300 mm", "20x20 V-slot 300", "2020 extrusion 300 mm", "V-slot 20x20x300"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-400"

title = "V-slot 20 × 20, 400 mm"

params = { length = 400 }

aliases = ["2020 V-slot 400 mm", "V-slot 2020 400 mm", "20x20 V-slot 400", "2020 extrusion 400 mm", "V-slot 20x20x400"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-500"

title = "V-slot 20 × 20, 500 mm"

params = { length = 500 }

aliases = ["2020 V-slot 500 mm", "V-slot 2020 500 mm", "20x20 V-slot 500", "2020 extrusion 500 mm", "V-slot 20x20x500"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-600"

title = "V-slot 20 × 20, 600 mm"

params = { length = 600 }

aliases = ["2020 V-slot 600 mm", "V-slot 2020 600 mm", "20x20 V-slot 600", "2020 extrusion 600 mm", "V-slot 20x20x600"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-750"

title = "V-slot 20 × 20, 750 mm"

params = { length = 750 }

aliases = ["2020 V-slot 750 mm", "V-slot 2020 750 mm", "20x20 V-slot 750", "2020 extrusion 750 mm", "V-slot 20x20x750"]

standard = "FreeCAD-library 2020 V-slot"

[[presets]]

id = "V2020-1000"

100

title = "V-slot 20 × 20, 1000 mm"

101

params = { length = 1000 }

102

aliases = ["2020 V-slot 1000 mm", "V-slot 2020 1000 mm", "20x20 V-slot 1000", "2020 extrusion 1000 mm", "V-slot 20x20x1000"]

103

standard = "FreeCAD-library 2020 V-slot"

104

105

[[presets]]

106

id = "V2020-1500"

107

title = "V-slot 20 × 20, 1500 mm"

108

params = { length = 1500 }

109

aliases = ["2020 V-slot 1500 mm", "V-slot 2020 1500 mm", "20x20 V-slot 1500", "2020 extrusion 1500 mm", "V-slot 20x20x1500"]

110

standard = "FreeCAD-library 2020 V-slot"

111

name = "steve/v-slot-extrusion"
version = "1.0.0"
runtime = "steve"
license = "MIT"
summary = "20 x 20 V-slot aluminium extrusion, any length, measured from the published FreeCAD-library model."
description = """A 20 x 20 mm V-slot aluminium extrusion: a V-slot in each face (45 degree V down to the lips, flat lip \
undersides, the undercut, 45 degree walls to the core), 0.5 mm outside corner radii and a 4.2 mm centre bore, \
extruded to any length. The section was measured from the FreeCAD-library model 2020x50_V_slot_profile (CC-BY-3.0, \
by hasecilu); there is no manufacturer drawing.

Centred on the origin in the XY plane, extruded along +Z. Dimensions and attribution: see the README."""
tags = ["profile", "extrusion", "aluminium", "v-slot", "2020", "frame", "metric"]

[parameters.length]
type = "number"
default = 100
min = 5
max = 3000
unit = "mm"
label = "Length"

[parameters.finish]
type = "choice"
default = "clear"
choices = ["clear", "black"]
label = "Anodising"

[[presets]]
id = "V2020-50"
title = "V-slot 20 × 20, 50 mm"
params = { length = 50 }
aliases = ["2020 V-slot 50 mm", "V-slot 2020 50 mm", "20x20 V-slot 50", "2020 extrusion 50 mm", "V-slot 20x20x50", "2020 x 50 mm extrusion"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-100"
title = "V-slot 20 × 20, 100 mm"
params = { length = 100 }
aliases = ["2020 V-slot 100 mm", "V-slot 2020 100 mm", "20x20 V-slot 100", "2020 extrusion 100 mm", "V-slot 20x20x100"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-150"
title = "V-slot 20 × 20, 150 mm"
params = { length = 150 }
aliases = ["2020 V-slot 150 mm", "V-slot 2020 150 mm", "20x20 V-slot 150", "2020 extrusion 150 mm", "V-slot 20x20x150"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-200"
title = "V-slot 20 × 20, 200 mm"
params = { length = 200 }
aliases = ["2020 V-slot 200 mm", "V-slot 2020 200 mm", "20x20 V-slot 200", "2020 extrusion 200 mm", "V-slot 20x20x200"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-250"
title = "V-slot 20 × 20, 250 mm"
params = { length = 250 }
aliases = ["2020 V-slot 250 mm", "V-slot 2020 250 mm", "20x20 V-slot 250", "2020 extrusion 250 mm", "V-slot 20x20x250"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-300"
title = "V-slot 20 × 20, 300 mm"
params = { length = 300 }
aliases = ["2020 V-slot 300 mm", "V-slot 2020 300 mm", "20x20 V-slot 300", "2020 extrusion 300 mm", "V-slot 20x20x300"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-400"
title = "V-slot 20 × 20, 400 mm"
params = { length = 400 }
aliases = ["2020 V-slot 400 mm", "V-slot 2020 400 mm", "20x20 V-slot 400", "2020 extrusion 400 mm", "V-slot 20x20x400"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-500"
title = "V-slot 20 × 20, 500 mm"
params = { length = 500 }
aliases = ["2020 V-slot 500 mm", "V-slot 2020 500 mm", "20x20 V-slot 500", "2020 extrusion 500 mm", "V-slot 20x20x500"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-600"
title = "V-slot 20 × 20, 600 mm"
params = { length = 600 }
aliases = ["2020 V-slot 600 mm", "V-slot 2020 600 mm", "20x20 V-slot 600", "2020 extrusion 600 mm", "V-slot 20x20x600"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-750"
title = "V-slot 20 × 20, 750 mm"
params = { length = 750 }
aliases = ["2020 V-slot 750 mm", "V-slot 2020 750 mm", "20x20 V-slot 750", "2020 extrusion 750 mm", "V-slot 20x20x750"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-1000"
title = "V-slot 20 × 20, 1000 mm"
params = { length = 1000 }
aliases = ["2020 V-slot 1000 mm", "V-slot 2020 1000 mm", "20x20 V-slot 1000", "2020 extrusion 1000 mm", "V-slot 20x20x1000"]
standard = "FreeCAD-library 2020 V-slot"

[[presets]]
id = "V2020-1500"
title = "V-slot 20 × 20, 1500 mm"
params = { length = 1500 }
aliases = ["2020 V-slot 1500 mm", "V-slot 2020 1500 mm", "20x20 V-slot 1500", "2020 extrusion 1500 mm", "V-slot 20x20x1500"]
standard = "FreeCAD-library 2020 V-slot"

README.md 55 lines · Markdown

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V-slot extrusion 20 × 20

A 20 × 20 mm V-slot aluminium extrusion, any length: a V-slot in each face, 0.5 mm outside corner radii and a 4.2 mm centre bore.

Geometry

The section is centred on the origin in the XY plane and extruded along +Z by length. Each of the four slots (the same, turned 90°), from the face inwards:

Feature	mm
Outside, square	20
Outside corner radius	0.5
Slot width at the face	9.7
Width between the lip tips (45° V, 1.8 below the face)	6.1
Lip underside, from the centre (flat out to the undercut wall)	8.2
Undercut width	11.0
Undercut wall ends, from the centre (then 45° to the core)	6.5607
Core face width / from the centre	5.6786 / 3.9
V notch in the core face, width × depth	0.4 × 0.2
Centre bore	Ø 4.2

Section area 168.01 mm² (0.454 kg/m in 6063).

Parameters

Parameter	Meaning
`length`	mm
`finish`	anodising colour, `clear` or `black` (appearance only)

Sources

There is no manufacturer drawing behind this part: the geometry was measured from the published reference model below, on its cross-section at mid-length (exact OCCT section edges), and the recipe re-draws that section in its own code. Each preset is checked against the model: bounding box within 0.05 mm, volume within 2 %, section area within 2 % and the section outline within 0.1 mm of the model's.

FreeCAD-library, Mechanical Parts/Mountings/2020_V-slot_Al_extrusion/2020x50_V_slot_profile-Part.step (commit 2e36ae32), by hasecilu; https://github.com/FreeCAD/FreeCAD-library; licensed under CC-BY-3.0 (the library's licence for all its parts). Distributed by step.parts as 2020x50_v_slot_profile (https://www.step.parts/parts/2020x50_v_slot_profile), identical geometry. No endorsement by the author or the FreeCAD project is implied.

Simplifications: none beyond the reference model's own (it has no fillets inside the slots and no end threads). The model is a generic 20 × 20 V-slot; check a specific maker's section (OpenBuilds and others differ slightly) where it matters.

Presets: the 50 mm reference sample and the catalogue's V-slot lengths (100 to 1500 mm). The catalogue's own models at those lengths, and its 20 × 40 to 20 × 80 entries, are step.parts' simplified stand-ins (a rectangle with one rectangular groove per face), not V-slot sections: they are not used, and the length presets are checked against the reference model's section (area and outline as above, volume = its section area × length). Preset list: from the step.parts catalogue (MIT), see library/NOTICE.md.

# V-slot extrusion 20 × 20

A 20 × 20 mm V-slot aluminium extrusion, any length: a V-slot in each face, 0.5 mm outside corner radii and a 4.2 mm

centre bore.

## Geometry

The section is centred on the origin in the XY plane and extruded along +Z by `length`. Each of the four slots (the

same, turned 90°), from the face inwards:

| Feature | mm |

|---|---|

| Outside, square | 20 |

| Outside corner radius | 0.5 |

| Slot width at the face | 9.7 |

| Width between the lip tips (45° V, 1.8 below the face) | 6.1 |

| Lip underside, from the centre (flat out to the undercut wall) | 8.2 |

| Undercut width | 11.0 |

| Undercut wall ends, from the centre (then 45° to the core) | 6.5607 |

| Core face width / from the centre | 5.6786 / 3.9 |

| V notch in the core face, width × depth | 0.4 × 0.2 |

| Centre bore | Ø 4.2 |

Section area 168.01 mm² (0.454 kg/m in 6063).

## Parameters

| Parameter | Meaning |

|---|---|

| `length` | mm |

| `finish` | anodising colour, `clear` or `black` (appearance only) |

## Sources

There is no manufacturer drawing behind this part: **the geometry was measured from the published reference model**

below, on its cross-section at mid-length (exact OCCT section edges), and the recipe re-draws that section in its own

code. Each preset is checked against the model: bounding box within 0.05 mm, volume within 2 %, section area within 2 %

and the section outline within 0.1 mm of the model's.

- **FreeCAD-library**, `Mechanical Parts/Mountings/2020_V-slot_Al_extrusion/2020x50_V_slot_profile-Part.step`

(commit 2e36ae32), by **hasecilu**; https://github.com/FreeCAD/FreeCAD-library; licensed under

[CC-BY-3.0](https://creativecommons.org/licenses/by/3.0/) (the library's licence for all its parts). Distributed by

step.parts as `2020x50_v_slot_profile` (https://www.step.parts/parts/2020x50_v_slot_profile), identical geometry.

No endorsement by the author or the FreeCAD project is implied.

Simplifications: none beyond the reference model's own (it has no fillets inside the slots and no end threads). The

model is a generic 20 × 20 V-slot; check a specific maker's section (OpenBuilds and others differ slightly) where it

matters.

Presets: the 50 mm reference sample and the catalogue's V-slot lengths (100 to 1500 mm). The catalogue's own models

at those lengths, and its 20 × 40 to 20 × 80 entries, are step.parts' simplified stand-ins (a rectangle with one

rectangular groove per face), not V-slot sections: they are not used, and the length presets are checked against the

reference model's section (area and outline as above, volume = its section area × length). Preset list: from the

step.parts catalogue (MIT), see `library/NOTICE.md`.

# V-slot extrusion 20 × 20

A 20 × 20 mm V-slot aluminium extrusion, any length: a V-slot in each face, 0.5 mm outside corner radii and a 4.2 mm
centre bore.

## Geometry

The section is centred on the origin in the XY plane and extruded along +Z by `length`. Each of the four slots (the
same, turned 90°), from the face inwards:

| Feature | mm |
|---|---|
| Outside, square | 20 |
| Outside corner radius | 0.5 |
| Slot width at the face | 9.7 |
| Width between the lip tips (45° V, 1.8 below the face) | 6.1 |
| Lip underside, from the centre (flat out to the undercut wall) | 8.2 |
| Undercut width | 11.0 |
| Undercut wall ends, from the centre (then 45° to the core) | 6.5607 |
| Core face width / from the centre | 5.6786 / 3.9 |
| V notch in the core face, width × depth | 0.4 × 0.2 |
| Centre bore | Ø 4.2 |

Section area 168.01 mm² (0.454 kg/m in 6063).

## Parameters

| Parameter | Meaning |
|---|---|
| `length` | mm |
| `finish` | anodising colour, `clear` or `black` (appearance only) |

## Sources

There is no manufacturer drawing behind this part: **the geometry was measured from the published reference model**
below, on its cross-section at mid-length (exact OCCT section edges), and the recipe re-draws that section in its own
code. Each preset is checked against the model: bounding box within 0.05 mm, volume within 2 %, section area within 2 %
and the section outline within 0.1 mm of the model's.

- **FreeCAD-library**, `Mechanical Parts/Mountings/2020_V-slot_Al_extrusion/2020x50_V_slot_profile-Part.step`
  (commit 2e36ae32), by **hasecilu**; https://github.com/FreeCAD/FreeCAD-library; licensed under
  [CC-BY-3.0](https://creativecommons.org/licenses/by/3.0/) (the library's licence for all its parts). Distributed by
  step.parts as `2020x50_v_slot_profile` (https://www.step.parts/parts/2020x50_v_slot_profile), identical geometry.
  No endorsement by the author or the FreeCAD project is implied.

Simplifications: none beyond the reference model's own (it has no fillets inside the slots and no end threads). The
model is a generic 20 × 20 V-slot; check a specific maker's section (OpenBuilds and others differ slightly) where it
matters.

Presets: the 50 mm reference sample and the catalogue's V-slot lengths (100 to 1500 mm). The catalogue's own models
at those lengths, and its 20 × 40 to 20 × 80 entries, are step.parts' simplified stand-ins (a rectangle with one
rectangular groove per face), not V-slot sections: they are not used, and the length presets are checked against the
reference model's section (area and outline as above, volume = its section area × length). Preset list: from the
step.parts catalogue (MIT), see `library/NOTICE.md`.

Use this part

STEVE

Open in STEVE

Open it in STEVE The STEVE runtime runs in STEVE: open the part there, or download the code and bundle.

Get the code

curl -o part.py "https://pythonparts.org/p/steve/v-slot-extrusion/v/1.0.0/raw/part.py"

Raw files, bundle and API

part.py
pypart.toml
README.md
bundle.tar.gzthe package, as published

curl "https://pythonparts.org/api/v1/parts/steve/v-slot-extrusion/1.0.0"

The version's JSON (parameters, presets, files); add /build?name=value for a build at other values.

About this part

steve58 parts

Profile

Aluminum (generic)Aluminum alloys · Custom finish · 2.7 g/cm³

Mass: 45.4 g

At the parameters shown in the viewer.

License: MIT

Permissive: use, change and sell it; keep the copyright notice.

Runtime: STEVE
Built with: CadQuery 2.9.0.dev0
Published: Nov 1, 2026
Downloads: 0
Builds: 0
Stars: 0
Bundle: ae2ebb562f54…

#profile #extrusion #aluminium #v-slot #2020 #frame #metric

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A 20 x 20 mm V-slot aluminium extrusion: a V-slot in each face (45 degree V down to the lips, flat lip undersides, the undercut, 45 degree walls to the core), 0.5 mm outside corner radii and a 4.2 mm centre bore, extruded to any length. The section was measured from the FreeCAD-library model 2020x50_V_slot_profile (CC-BY-3.0, by hasecilu); there is no manufacturer drawing. Centred on the origin in the XY plane, extruded along +Z. Dimensions and attribution: see the README.

V-slot extrusion 20 × 20

A 20 × 20 mm V-slot aluminium extrusion, any length: a V-slot in each face, 0.5 mm outside corner radii and a 4.2 mm centre bore.

Geometry

The section is centred on the origin in the XY plane and extruded along +Z by length. Each of the four slots (the same, turned 90°), from the face inwards:

Feature	mm
Outside, square	20
Outside corner radius	0.5
Slot width at the face	9.7
Width between the lip tips (45° V, 1.8 below the face)	6.1
Lip underside, from the centre (flat out to the undercut wall)	8.2
Undercut width	11.0
Undercut wall ends, from the centre (then 45° to the core)	6.5607
Core face width / from the centre	5.6786 / 3.9
V notch in the core face, width × depth	0.4 × 0.2
Centre bore	Ø 4.2

Section area 168.01 mm² (0.454 kg/m in 6063).

Parameters

Parameter	Meaning
`length`	mm
`finish`	anodising colour, `clear` or `black` (appearance only)

Sources

FreeCAD-library, Mechanical Parts/Mountings/2020_V-slot_Al_extrusion/2020x50_V_slot_profile-Part.step (commit 2e36ae32), by hasecilu; https://github.com/FreeCAD/FreeCAD-library; licensed under CC-BY-3.0 (the library's licence for all its parts). Distributed by step.parts as 2020x50_v_slot_profile (https://www.step.parts/parts/2020x50_v_slot_profile), identical geometry. No endorsement by the author or the FreeCAD project is implied.

1.0.0 Latest Nov 1, 2026 · 1 day ago

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steve/v-slot-extrusion

V-slot extrusion 20 × 20

Geometry

Parameters

Sources

V-slot extrusion 20 × 20

Geometry

Parameters

Sources

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