# I think its a bearing problem **URL:** \ **Category:** ❓ Something's Up\ **Created:** [November 4, 2025, 7:41pm UTC](https://forum.sienci.com/t/i-think-its-a-bearing-problem/24843 "2025-11-04T19:41:01Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![courtney](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/67e7ee/32.png) [@courtney](https://forum.sienci.com/u/courtney)\ **Post date:** [November 4, 2025, 7:41pm UTC](https://forum.sienci.com/t/i-think-its-a-bearing-problem/24843/1 "2025-11-04T19:41:01Z")
altmill 4x4. ok from the front of the machine the the bearing on the right back side of the ball screw is making a ton of noise. has since assembly but its getting worse. its an oscilating noise kinda sounds like a grinding noise sort of. moving the gantry left and right is very quiet and smooth. moving it forward and back is kinda loud and also carries a vibration through the machine. need a direction to go with this. do i need a new bearing block? is this something that is offered? ---
**Author:** ![Jens](https://forum.sienci.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@Jens](https://forum.sienci.com/u/Jens)\ **Post date:** [November 4, 2025, 7:59pm UTC](https://forum.sienci.com/t/i-think-its-a-bearing-problem/24843/2 "2025-11-04T19:59:05Z")
I believe there was a similar problem mentioned some time ago and I think the bolts that attach the block to the gantry were not tightened during assembly. Note that this memory is fuzzy so not guarantees …. Found this: > [@New setup - loud chattering from right side ball screw nut?](https://forum.sienci.com/t/new-setup-loud-chattering-from-right-side-ball-screw-nut/21970): > > I have a brand new AltMill 2x4 setup. I was just preparing to surface the spoil board, and then found a very loud chattering coming from what appears to be the right side ball screw nut.it only occurs when the y axis is in certain spots ( it happens on most of it), and only at higher traverse speeds. It sounds horrible, and unhealthy, so I did not proceed with the surfacing, and have been trying to dog into troubleshooting first, 1 - only a higher speeds. When on “precise” speed, it makes not a… ---
**Author:** ![courtney](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/67e7ee/32.png) [@courtney](https://forum.sienci.com/u/courtney)\ **Post date:** [November 4, 2025, 11:37pm UTC](https://forum.sienci.com/t/i-think-its-a-bearing-problem/24843/3 "2025-11-04T23:37:16Z")
this noise is is very rythmic and doest have a certain spot. its constant and i think i have checked all of the bolts. i can pinpoint the exact spot on the machine that is making the noise. ---
**Author:** ![PickleEngineering](https://forum.sienci.com/letter_avatar_proxy/v4/letter/p/9fc29f/32.png) [@PickleEngineering](https://forum.sienci.com/u/PickleEngineering)\ **Post date:** [November 7, 2025, 6:01pm UTC](https://forum.sienci.com/t/i-think-its-a-bearing-problem/24843/4 "2025-11-07T18:01:52Z")
My machine got way quieter when I spent the time to use a machinists level and get the y axis rails closer to being coplanar. I also used a dial indicator on the spoilboard after leveling to further dial in the height of the legs. I now get less than 0.002” variation across the entire spoilboard. ---
**Author:** ![Spamming\_Eddie](https://forum.sienci.com/user_avatar/forum.sienci.com/spamming_eddie/32/7296_2.png) [@Spamming\_Eddie](https://forum.sienci.com/u/Spamming_Eddie)\ **Post date:** [November 9, 2025, 7:13pm UTC](https://forum.sienci.com/t/i-think-its-a-bearing-problem/24843/5 "2025-11-09T19:13:39Z")
> [@courtney](#): > > i can pinpoint the exact spot on the machine that is making the noise. The suspence is killing me. Please do spill the pin ‘o beans. I have no altmill so can’t offer much assistance other than asking if you have contacted Sienci. Things that do noisy stuff, and get worse over time do mostly not indicate a good sign and need to be adressed asap. Let the siencitist assist you. (Don’t forget spill the beans on them, the more the better.) ---
**Author:** ![courtney](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/67e7ee/32.png) [@courtney](https://forum.sienci.com/u/courtney)\ **Post date:** [November 13, 2025, 2:29pm UTC](https://forum.sienci.com/t/i-think-its-a-bearing-problem/24843/6 "2025-11-13T14:29:43Z")
its directly infront of the motor. so that only leaves the bearing on the screw. or a loose coupling slipping. ive tried to move it by hand to find any slippage. there wasnt any.