Technical recording. Carbon Fiber. Mold == PVA
Submitted by Alexdobrianski on February 12, 2013
Not much to say – was video recoded to analyze what went wrong –
(a) dimensions of a mold – PVA’s 3D printed parts are 0.3 mm tolerance and depend on a tracing process (g-code generator) it has “quantum” effects, small changes and part become 0.3mm longer. That effected round parts. Configuration for 3D printer depend on 3 stretching coefficients. Better they will be equal 1 and then in 3D model will be adjustment of dimensions.
(b) Tolerance of any dimensions has to be remover (because of the reason (a). And adjustment should be done manually.
(c) Carbon “sweater” is little bit thick especially soaked in epoxy – it takes extra pressure to insert. Distance btw walls (in main stepper motor's holder) has to be increased by 1mm.
(d) Final size for stepper motor's holders must be 0.3 mm plus.
(e) Wall for second stepper motor (camera stand/ antenna mechanism) needs to be 15mm low – mistake.
(f) No “impact adsorption” epoxy layer. Stepper motor’s mounts (on rover – not on ground station) needs to be treated by additional layer of epoxy with microspheres to accommodate impact. 203C, 10h baking will be for fully assembled frame.