# Jerks at full speed on Y axis **URL:** \ **Category:** Uncategorized\ **Created:** [December 13, 2023, 9:31pm UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975 "2023-12-13T21:31:23Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Guy77](https://avatars.discourse-cdn.com/v4/letter/g/8491ac/32.png) [@Guy77](https://forum.onefinitycnc.com/u/Guy77)\ **Post date:** [December 13, 2023, 9:31pm UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975/1 "2023-12-13T21:31:23Z")
I have been using my x35 woodworker for 5 months now and it has been great. Last 5 days that I have been using it I noticed that when homing the machine it stops short on the Y axis by a lot 1ft to 6 in. I restart the machine and then home it again and everything works fine. Today I noticed if I move at full speed along the Y axis the machine jerks as it does not want to move so I quickly stop and lower the speed to just less than full speed on the joystick control and it moves fine. I was able to successfully finish the cut I had to make on the plywood I am using to cut finger joints for speaker cabinets. I was wondering why the machine jerks at full speed and why the homing is off on Y axis. I cut a lot 3/4 in birch plywood and it makes a lot of wood debris so maybe thats the issue too. I vacum everything after doing my 45 min cuts. Otherwise this machine has been rock solid for me! Any help appreciated. Thanks Guy Toronto. ---
**Author:** ![DCK](https://avatars.discourse-cdn.com/v4/letter/d/7bcc69/32.png) [@DCK](https://forum.onefinitycnc.com/u/DCK)\ **Post date:** [December 13, 2023, 9:41pm UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975/2 "2023-12-13T21:41:29Z")
Sounds like one of your y-axis motors isn’t working, so the y gantry is being moved from only one side. Unplug the motor on the side that is homing properly. Then use your controller amd see if you have any y-axis movement at all. ---
**Author:** ![Guy77](https://avatars.discourse-cdn.com/v4/letter/g/8491ac/32.png) [@Guy77](https://forum.onefinitycnc.com/u/Guy77)\ **Post date:** [December 13, 2023, 9:50pm UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975/3 "2023-12-13T21:50:10Z")
Thanks Dan, That makes sense. I will be home on Friday and I will unplug one of the Y axis motors and see what happens! The X and Z axis home perfectly. ---
**Author:** ![WaywardWoodworker](https://avatars.discourse-cdn.com/v4/letter/w/e79b87/32.png) [@WaywardWoodworker](https://forum.onefinitycnc.com/u/WaywardWoodworker)\ **Post date:** [December 13, 2023, 9:53pm UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975/4 "2023-12-13T21:53:28Z")
I would suggest checking for debris in the ball nut assembly too, it is a very common source of issues when not using continuous dust collection. > [@How to clean the ball nut on the Onefinity CNC // Support](https://forum.onefinitycnc.com/t/how-to-clean-the-ball-nut-on-the-onefinity-cnc-support/9402): > > How to clean the ball nut on the Onefinity CNC. We recommend every 50 to 100 hour cleaning intervals (or more depending on material and dust collection used) WARNING Do NOT remove the ball nut from the ball screw to service it unless instructed by Onefinity Support. If removed, it’s possible the 50 or so tiny ball bearings can fall out and they are very hard to ‘repack’. Please perform all maintenance with the ball nut on the ball screw like this video shows. 3 in 1 oil: [https://amzn.to/3pAlq…](https://amzn.to/3pAlqFV?tag=benmyers-20) > [@The importance of dust collection and maintenance on the Onefinity](https://forum.onefinitycnc.com/t/the-importance-of-dust-collection-and-maintenance-on-the-onefinity/8996): > > We wanted to show the importance of using proper dust collection and following our maintenance practices. This is a recently ‘defective’ rail that was returned to us. The culprit is very clearly debris in the rails. When pulling out the ball nut from the gantry, this is the amount of dust that just fell right out. This is one of the worst cases we’ve come across. The gantry was getting ‘stuck/hung’ during movement, and after replacing wires and tightening grub screws, it persisted. Only wh… ---
**Author:** ![Guy77](https://avatars.discourse-cdn.com/v4/letter/g/8491ac/32.png) [@Guy77](https://forum.onefinitycnc.com/u/Guy77)\ **Post date:** [December 13, 2023, 9:55pm UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975/5 "2023-12-13T21:55:11Z")
Thanks. Great information there. Lots of checking to do! I will be busy for a while lol. ---
**Author:** ![OnefinityCNC](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/onefinitycnc/32/7_2.png) [@OnefinityCNC](https://forum.onefinitycnc.com/u/OnefinityCNC)\ **Post date:** [December 13, 2023, 9:59pm UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975/6 "2023-12-13T21:59:51Z")
> [@Troubleshooting: Rail is getting hung, stuck, grinding, or moving in opposite direction](https://forum.onefinitycnc.com/t/troubleshooting-rail-is-getting-hung-stuck-or-out-of-alignment-x35-x50-machines/10826/1): > > Rail is getting hung/stuck/grinding. Special notes to read before following each step: A rail getting stuck/hung is typically one of two things, either a wire/connection issue or the grub screw on the ball screw isn’t tight on the side that isn’t moving. One thing to remember, stall homing adjustments do NOT affect rail movement during cutting or jogging. If the rail isn’t moving correctly during cutting or jogging, incorrect stall homing is an affect of this greater issue. Any time the axis … ---
**Author:** ![Guy77](https://avatars.discourse-cdn.com/v4/letter/g/8491ac/32.png) [@Guy77](https://forum.onefinitycnc.com/u/Guy77)\ **Post date:** [December 13, 2023, 10:01pm UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975/7 "2023-12-13T22:01:37Z")
Thank you Onefinity Team. I will go through those steps this weekend. Cheers Guy ---
**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\ **Post date:** [December 14, 2023, 2:16am UTC](https://forum.onefinitycnc.com/t/jerks-at-full-speed-on-y-axis/23975/8 "2023-12-14T02:16:36Z")
Hey Guy, > [@X axis slop journeyman 50](https://forum.onefinitycnc.com/t/x-axis-slop-journeyman-50/23681/3): > > Onefinity provides a help file which deals with many kinds of erratic movements of an axis: > > - [Troubleshooting: Rail is getting hung, stuck, or out of alignment](https://forum.onefinitycnc.com/t/troubleshooting-rail-is-getting-hung-stuck-or-out-of-alignment/10826) > > **I would check all points one by one to see why your carriage seems to loose steps.** > > There are three causes that are **not** mentioned in the document above: > > 1. **Should your machine not be properly [rectangular (“squared”) and coplanar (not twisted)](https://forum.onefinitycnc.com/t/what-do-i-do-first/18349/6), the Y movement can block.** > > 2. And the second possible cause not mentioned in the document above is: [This mysterious issue](https://forum.onefinitycnc.com/t/help-losing-home-during-carves/7022/70) some time ago. > [@Y rail and homing problems](https://forum.onefinitycnc.com/t/y-rail-and-homing-problems/23440/7): > > 1. [Electromagnetic interference (EMI)](https://en.wikipedia.org/wiki/Electromagnetic_interference), as e.g. [mentioned here](https://forum.onefinitycnc.com/t/weird-bahavior-between-controller-and-110-volt-2-2-kw-huanyang-spindle/15650/10). * * *