push rods

Hallo,
I,m new on this forum, and i have a question.
I,m building a Rostock, some of the parts are printed by a friend. But i don,t want to overload him with needed printed parts.
So i decided t make the push rods, myself.
I orderd the carbon rods and fish eye bearings. But i chose the wrong one , the are to big( m4, and metal).
I saw on the internet also the traxxas bearings,made of plastic with inner metal, are these good enough for the job, ore must i order smaller metal fish eye bearings.
Thanks

Hi,

I think you'd better go with traxxas at first because there're many trial examples here and there. You'll be able to print parts by yourself sooner, then you can build another bot with M4 joints.
You may find good threads about delta bot at the following section. Good luck!

Home > Machines Organized by Style > Delta Machines
Home > Machines Organized by Name > Fisher

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Genie - designer of bitfab::Hexagon Heatedbed in purple. PM me if you wish to get original one of the best quality.

Traxxas 5347 joints can be made to work well. I recommend you buy 2 packs of 12, assemble them all using the hot/cold method, then pick 12 with no slop in them and use those. Use M4 x 20mm set screws to connect them to 6mm o.d x 4mm i.d. CF tube. Screw one end of the set screw into the Traxxas joint, then epoxy the other end into the CF tube. Use a jig to hold the joints the right distance apart while the epoxy sets. Build them all on the same jig to get them exactly the same length.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Hallo dc42,
Can you explain me what is the hot/cold method?
Thanks.

Put the balls in the freezer for a while, and heat the plastic rod ends in boiling water. Then assemble them quickly before they have a chance to heat and cool. There is a printable assembly tool on Thingiverse which I link to in my delta printer build blog.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].