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A2
The stepper motors look sweet!
Add says round shaft, does that mean there is not a flat on the shaft?
Will they work with the Mega: 4.2A?
Fiberglass tubes softening at 140 F doesn't sound good.
I like the idea of using aluminum for the arms, price looks good, got a link?
The motors I decided on need external drivers. That's what drove me to the package I bought. The dirvers will do the 4.2A / 48V stuff and opto-isolate the Mega / Ramps combo. That way strange ground bounce issues in the motor world are less likely to crash the Mega.
I looked at several online metal outfits for the aluminum tube and they all had prices in the same ballpark. I'd like to get some confirmation that a hollow core rectangular tube is likley to be stiff enough for the application. If need be, I still have the "mill it out of a solid bar" approach to fall back on. There is indeed a lot of torque going to be flying round between the rods via the center of this beast.
My objective is to double the build volume of the standard design. I know I should have worked that out and stated it earlier. More or less I'm headed for something > 400mm dia and > 500 mm tall. If that drives me to 5' screws, so be it. They will either be 4 or 5 feet since it's all sold by the whole foot.
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I just picked up on the move to ConceptForge for some of this ... somehow I missed that point earlier.