RepRec narrow part size range convention
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This page is part of the RepRec project. Short for Replicating Recomposer Systems. For an index of all pages of this project, see the category page RepRec. |
Size ratio biggest-part to smallest-part (bounding boxes)
Maximum range bound from robotics:
The size range of parts handeled by RepRec systems shall be narrow enough
to be handleable by just one single assembly level.
Minimum range from feature/detail:
The ratio of maximal size to achievable resolution shall be big enough to allow for proper clearances.
For RepRec systems these are self imposed design decisions of core importance.
Macroscale
Extra desiderata for macroscale:
The size of parts should be as small as possible to keep parts low in mass.
Both inertial forces and especially gravitationally accumulative load are relevant there.
Nanoscale
The size of parts can not be increased continuously.
Adding a single lattice period of atoms (in linear, rotational, helical, geodesic, or whatever fashion)
causes a discrete (often repeatable) jump in size.
Crystolecule sizes are somewhat of digital grid like in nature.
See: RegularPeriodExtension
But then again not really.
Passivation layers and and non-covalent non-bonded sliding interfaces are not zero thickness and
add on each side a layer (thus two layers, if opposing parallel surfaces) of thickness to the parts
that thickness in mist cases is quite incommensurate to the parts internal crystal lattice periodicity.
Sub lattice size clearance picking via quasiamorphicity & Kaehler brackets
The size of crystolecule parts can be increased/decreased more continuously
via complex changes of bond topology inside parts.
See: Quasiamorphicity & Kaehler brackets.
This requires solving a difficult puzzle problem for every desired particular dimension
The adjacent solutions (next smaller and bigger sizes)
for monotonic falling/rising consecutive size dimensions have nothing in common with each other.
Each new size is a hard to find one-off solutions. The more precision desired the harder the result to find.
Also, since there is no regular crystal structure,
mechanical (and other) properties will more or less vary with solutions for different sizes.
(Change of other properties may be just accepted or added as an additional constraint).
This puts higher demands on mechanosynthesis capabilities.
With this designs can be made more compact than in the case of naive regular lattice period extension.
Sub lattice clearance picking by self center clamping
Half shells for sliding interfaces allow for tuneable distance even for the smallest parts.
With this trick designs can be made more compact
compared to the case of naive regular lattice period extension.
Avoiding the need for quasiamorphicity.
Limits on the smallest size end of parts
★ It becomes more difficult to build whole system where all parts fit together.
… Especially if there is a desire for interfaces that are supposed to go together in a many to many way. Think axles and sleeves.
… E.g. crystolecule approximations of Hirth joints need a little bit larger size to work well and give some angle indexing possibilities like e.g. 12.
★ Smaller part sizes may make parts more vulnerable to ionizing radiation.
Related
Created 2018-10-23 Tuesday – Migrated to public wiki 2026-09-05