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This part looks good to me, although the geometry is clearly a combination
between older Duplo parts and newer Duplo parts.
The OD is clearly correct because it exactly doubles a System stud. You can
demonstrate with a pair of plates that the space between Duplo studs is
exactly twice the space between System studs. Since the overall size is
also doubled, the stud must be doubled.
The ID is correct for *older Duplo parts* becaue it matches the OD of a
System bottom tube. The newer Duplo pieces have a larger ID most of the way
down, but have flattened binding surfaces that the older design lacks.
Modeling this surface would be gratuitous, so this is a perfectly acceptable
solution.
The height appears to be correct for *newer Duplo parts*. Older Duplo parts
have shorter studs. I would guess that they heightened the piece to add
more binding surface in order to make up for the change on the underside.
The older tubes had cutouts for System studs, while newer ones simply have
shorter tubes that end above the System studs.
--
Tony Hafner
www.hafhead.com
In lugnet.cad.dat.parts.primitives, Tore Eriksson writes:
> 0 Duplo Stud 2
> 0 Name: studdu2.dat
> 0 Author: Tore Eriksson
> 0 Un-Official Primitive
>
> 1 16 0 0 0 8 0 0 0 0 0 0 0 8 4-4edge.dat
> 1 16 0 0 0 12 0 0 0 0 0 0 0 12 4-4edge.dat
> 1 16 0 -11 0 8 0 0 0 0 0 0 0 8 4-4edge.dat
> 1 16 0 -11 0 12 0 0 0 0 0 0 0 12 4-4edge.dat
> 1 16 0 -11 0 8 0 0 0 11 0 0 0 8 4-4cyli.dat
> 1 16 0 -11 0 12 0 0 0 11 0 0 0 12 4-4cyli.dat
> 1 16 0 -11 0 4 0 0 0 0 0 0 0 4 ring2.dat
> 0
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