Once the Y-axis single bearing holders are tighten down it causes a tight Y-axis. I tried various ways to screw it down to no avail.
I checked out the Y axis mentioned above. It is very tight despite adjustments. The y bearing holder that were printed for the prototypes all seemed to work fine. @kforrest do you know the hole dia on those bearing holder?
If this becomes an issue, we can change the position of the slot to be downward facing instead of against the bed and that should allow variability. The current design has the hole slightly undersized so the bushing opens the slot more and when fastened, the screws should compress the bushing as to not make it vibrate, but no more than that.
@west I am confirming that it's the shape of the bearing holders causing the Y-axis to resist movement. 3 out of the 12 (25% fail rate) I have built are stiff. I have tried the best I could to try many different ways to allow movement. May I ask the purpose of the slot in the bearing? In my opinion, we do not want give the part a chance to compress at all. Can we try no slot or is this to allow the bushing to be pressed easily?
If we dont allow compression then there could be vibration introduced. The new slotted part allows more variance in the printed part so they dont have to be exactly the same every time. The old slot was designed to only compress the bushing when fastened down to prevent vibrating, but there is a tighter tolerance with the old version. We will try out the new ones to see how they work
Yeah we can do that. To determine which version we ship on the Alphas, we need to decide if the tight axis due to the deformation of the y-bearing is a critical design failure. If it is, we have to change it to the new version for the alpha builds. If it is not, we ship it with the alpha version of that part.