Why don’t you see diagonal supports on the frames of delta machines? There has to be rotational forces and the frames tend to be pretty high and narrow.
Flex? I’d not be surprised to hear that the soft aluminium extrusions flex more that the carbon fiber rods to the effector in my delta. And yes frame support can be an issue, hence people making braces to add a bit of support. http://www.thingiverse.com/thing:626279
the printer i am currently designing combines diagonal bracing into the printers case/shell.
Wouldn’t it be easier, cheaper and more efficient (than corner braces) to put some guitar strings crossing each other between the corners of one side? If the length is the same you know all angles are right and if they also make the same sound when strung they have equal tension too (causing no rotational force). Have it on one side to stop rotation, two for preventing a leaning tower of Pisa. Did I miss something (I’m not a mechanical engineer)
@Hannes_Lilliefeldt and what if they dont…
My guitars don’t (significantly) change in length when I tune the strings. Perhaps easier to just nail a 2x4 diagonally…
Depending on the delta design it may be easier to put an “X” cable set below the lowest point the carriage could reasonably get in the gaps Y-Z, X-Z. Mounting things on the verticals is problematic as only one face is free. How would you suggest attaching said guitar strings?
@Mark_MARKSE_Emery that’s what I missed! Carriage goes outside the frame. Thanks. Mystery solved.
@Hannes_Lilliefeldt it’s not often the the carriage goes outside the frame. usually linear rails would be mounted on the inside
I think it depends a lot on your design and how fast you intend to print. I am using 6mm aluminium plate for the base, floor and roof . The plates are joined arm secured to 30x30 aluminium extrusions that are bolted through the ends and also right angle brackets to add further strength. Add to this 6 x 12mm smooth rods and it is very rigid. There will also be polycarbonate covers that will improve is further.
Lol