Drawn and weighed from the same model.
This GA sheet for the Kenter shackle was generated by the app from the model above: third-angle views, a section, model data and a filled title block.
- Dimensions read off the model: 456, 319.2 and 79.8 mm.
- Model data: overall size, volume, surface area and mass.
- Section A-A, cut through the stud and the pin hole.
- Parts list and title block filled from the part, with its material and mass.
Mass, with its basis
5,546.65 cm³ × 7.85 g/cm³ = 43.54 kg
An estimate from the model’s volume and the density of carbon steel. When a drawing states the part’s mass, that declared figure is shown instead, with its source.
The source is kept, and you can edit it
# Kenter (joining) shackle for 76 mm stud-link chain: link-shaped, overall 6d x 4.2d,
# two C-halves locked by a central stud block and a tapered pin (drawn as a solid
# stud with the pin boss). Origin = centre, in the XY plane, long axis X.
from build123d import *
d = 76.0
L, W = 6 * d, 4.2 * d
wc = W - d
s = (L - d) - wc
r = wc / 2
with BuildLine() as cl:
Line((-s / 2, -r), (s / 2, -r))
ThreePointArc((s / 2, -r), (s / 2 + r, 0), (s / 2, r))
Line((s / 2, r), (-s / 2, r))
ThreePointArc((-s / 2, r), (-s / 2 - r, 0), (-s / 2, -r))
profile = Plane(origin=cl.line @ 0, z_dir=cl.line % 0) * Circle(d / 2)
body = sweep(profile, path=cl.line, transition=Transition.ROUND)
# central stud block joining the two halves, full bar depth
stud = Box(0.9 * d, wc, 0.9 * d)
# locking-pin boss on top of the stud, pin hole through it
boss = Cylinder(0.32 * d, 1.05 * d)
pin_hole = Cylinder(0.12 * d, 1.2 * d)
result = body + stud + boss - pin_holeChange d and the model, the drawing and the mass follow. Every rebuild is a new revision you can go back to.
Eighty seconds of the real app.
Recorded on the demo account. Stretches that are sped up are marked on screen. No sound.