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{{RepRec}}

== Aspect ratio near 1:1:1 ==

Just as the size range of parts shall be kept in a narrow range for [[RepRec]] systems, 
(See: [[RepRec narrow part size range convention]]) 
so shall the aspect ratio be kept reasonably near to 1:1:1 too. 

'''Motivation being limiting the need for robotic assembly robotics to one single size.''' 
★ Nanoscale a second size above mechanosynthesis and later eventually bigger sized assembly stages too. 
★ Macroscale a single size assuming part pre-production as cheap enough [[RepRec vitamins]] and larger scales remaining industrial. 

This self imposed design constraint means: 
★ '''Avoid very long thin struts''' 
★ '''Avoid big thin plates''' 
★ and everything in-between 

One could say that with parts with extreme aspect ratios 
one necessarily violates the narrow size range convention too. 
Either at the lower or the upper end of the part size scale. 

Of course pre-assembly of all sorts of chains 
(especially [[ReChain strut]]s and [[rigid chain]]s) 
with [[RepRec factorylets]] will eventually make the handling 
of parts with a bit larger aspect ratios unavoidably necessary. 

== Robotic Linkage Struts ==

[[RepRec systems]] need robotic stages as mechanisms 
and these often/typically contain long high aspect ration linkage mechanism struts. 
These mechanism struts could be made quickly changeable in length by using some [[ReChain frame system]] 
That is, beyond just using [[ReChain]] for the the static frame/truss/matrix ([[RepRec outer framework]]), 
using it for mobile parts in [[RepRec]]s too. 

'''The issues from these struts (being made from many low aspect ratio blocks) include:''' 
★ significant size overhead to monolithic struts (issue for nanoscale) 
★ significant mass overhead to monolithic struts (issue for macroscale) 
★ reduced load carrying capacity (maybe) due to pre-tensioning if that is used ([[ReChain]]). 

These issues are more critical for the moving parts than for the surrounding frame. 

If the struts become too long then they will start to need scaffolding. 
Like seen in cranes, bridges, and High voltage masts (just smaller). 

For [[FFF]] 3D printed structures such scaffolded structures would be large in size (for DIY scales at least) 
Too large for robotic linkages (DIY scale) and thus better only used just for the [[RepRec outer framework]]. 
{{wikitodo|Add relevant sketch.}} 

== Proteins based struts ==

In protein engineering there is a characterization length parameter (the [[persistence length]]) 
that informs about at which length self-assembled rods can no longer keep themselves straight. 
That is: Deviate from being strait as crossing a certain threshold average angle in bending. 
A topic more on the [[ReChain frame systems]] side. 

== Related ==

* [[RepRec narrow part size range convention]]
* [[ReChain frame systems]]

Original page created 2021-11-18 Thursday, migrated to public wiki 2026-09-05

RepRec aspect ratio - Revision history

Apm: bsic page (migrated over from desktop wili)