All the X and Y shafts are not straight: they have curve from 1 to 3 mm.
The thick rods or the thin rods?
That's pretty bad.
If the error is on the thick rods definitely throw them away. This will indeed cause stress and friction and binding.
On the thin rods it will cause exactly as much error on the part as on the rods. So if the error is on the far left of the X rod then parts will have a bend to them on the far left of the print bed. By the same amount. And there will be no extra friction or binding as long as the bearings slide okay. If the thin rods are overly bent then you cant slide the bearings along the rod.
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jonnybischof 60
It is a very big issue!
If your rods / shafts have straightness errors of 1mm or even more, then you can throw them right into the bin (or at the supplier..
)
Imho, even +- 0.1mm error is not desirable (but seemingly very hard to achieve).
Not only will you get issues with part dimensions, but you also increase friction ( = wear) in the gantry system if there is uneven movement.
Many people buy 2 or 3 times more shafts than they would need, and then use the best ones they get.
The best supplier for precision shafts (and other stuff like linear bearings, bushings, ball bearings, leadscrews, couplers and so on) that I know is Misumi. Japanese precision shafts rock, period
They also chamfer the shafts nicely, and have very good surface quality and hardness.
But they only supply companies, you can't make a customer account as a private person. And of course their premium quality comes with a high price.
If you have the possibility to buy from them via your company, then it's probably the best address there is.
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