Xnaron Magnetic U-joint option for Rostocks
by nyl0cke, published
forum.seemecnc.com/viewtopic.php?f=54&t=1704&sid=512048173d7806425ee0b8a411e75957 - The original thread
(post about the jig)
This will happen if you don't get all of the arms the exact same length. Build a jig to make them like this flickr.com/photos/13723140@N04/8771948345/ and flickr.com/photos/13723140@N04/8771958335/
This is a WIP, I designed this in one day and printed version 1. It seems to work, but I will update and post new files if I find any problems while using this mod.
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If built correctly, you shouldn't have to change anything theoretically, though I doubt you can avoid having to adjust the rod length.
When you exchange the printed joints to this new system, did you need to modify Carriage Offset and Effector Horizontal Offset in firmware or just tweaked the Delta Diagonal Rod setting?
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For the Rostock or Rostock mini, print 2 of the boom ends, an effector, and 3 of my magnetic carriages, as well as 12 rod adapters if you have .199" OD Carbon fiber tubes for your arms (I would recommend ABS). Assemble everything according to the instructions in the SeeMeCNC forum thread, and make sure you use the jig mentioned in the description to get consistent length arms, or they can become disconnected mid print
For the Rostock MAX print all of the same things, except for my carriages and the rod adapters, unless you want to use .199" CF arms on your MAX. Instead of the carriages, print the Cheapskate 90 degree ballends. The assembly is pretty much the same.
It is a good idea to read some of the forum thread to get an Idea of what to do an not to do while assembling, though before screwing the balls onto anything, you should tap the hole with either an M3 tap or by forcing an M3 bolt into it. Make sure not to strip the threads you create in the plastic, this is what keeps the ballbolts secured. Also, try to avoid putting torsion strain on the JB weld, It probably will break, AKA, dont twist the balls on by hand, especially if they are resisting threading into the hole. use a small pair of needle nose pliers instead.
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