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.
- Mentioned In
- rTAZQUIVER66cbb393910c: Merge branch 'T4807'
rTAZQUIVERc3005f9c7d42: Remove v1.1 add v1.2 with slot facing down T4807
rTAZQUIVER35d70c35d07f: Revert "Change position of slot on Y bearing holder T4807"
T4721: Add 2x 9.5mm ptfe chunks to BoM
rTAZQUIVER8ffe58ca60f6: Change position of slot on Y bearing holder T4807
- Mentioned Here
- T4708: PP-GP0246 extruder mount Opah
T4875: Josh gcode
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.
The new version doesnt have a way to tension. We could make them tension-able but that would be adding more hardware and I would only want the front or the back to be tension-able (another printed part ). I dont think it would be necessary to have all 4 be tension-able, that seems like overkill to me
When I checkout the T4807 branch I don't see any differences to master I only see the V1.1 and it has the slot on the bed side but I think the one that ended up working most consistently had the slot on the bottom side. We need to make the changes to the branch that address the issue and then test them before we can close this one. Or if what is in master is working then we just close the ticket.