Hi
Even after cleaning the ball nut on my Y axis (Machine OFF), I’m having a hard time moving the gantry block when the ball nut is set in its place. Without it, no problems the gantry moves very easily. Can someone post a video of what a ‘‘normal’’ resistance to move the gantry & ball nut assembly looks like? I just want to make sure before starting to buy some spare parts.
Thanks in advance.
Are you trying to pull the gantry with the controller off? It should be doable with one hand - but just. You are spinning the servo motors when you do that so it is not supposed to be easy.
Hi Chris,
Thanks for answering in such a timely manner. Yes the controller is OFF when I do that. I’m wondering why it gets almost impossible to move the gantry block, with the ball nut in, when I get 12’’ from the foot of the rail. 3/4 goes well but 1/4 when getting near the foot of the rail, where the motor is, is almost impossible.
Thanks Chris, we’ll sort this out,
bests,
Charles
Video #1 Rail issue? : https://www.transfernow.net/dl/20250904tdCsrZTr/pjdViJgk
Video #2 Ball nut rubs against the top ring of the gantry : https://www.transfernow.net/dl/20250904pn1TU48X/xhRWrN5Y
I think while trying to put back the ball nut that doesn’t want to go in, I messed up the thread of the bolts and maybe the ones from the gantry block. I couldn’t align the ball nut precisely enough I guess, since I couldn’t rotate when set in its place. What can I do about that?
Thanks
I did not realize you did not have the gantry bolted to the rails.
From the videos I have to think there is a defect with that one rail.
The ball nut should not hit the bearing as you are showing.
Each block should move smoothly on its rail fully from end to end with the same force.
It should not take as much force as you are using in the video and it should not get harder at the end.
My first guess is that the hole for the ball nut is bored in the wrong place.
Contact Onefinity about this:
Hi Chris,
5 words…
Thank you so very much!
I honestly didn’t want to buy parts and still not solve the whole issue. I ordered 2 ball nuts after being told that it was the problem. My stepper motor, the ball screw that bent… everything took a beating because of that defect rail. If it can help you, my machine is a 2021 3rd quarter X-50 Journeyman.
Here’s attached the last exchange I’ve had with Support@onefinitycnc.com concerning that issue. I don’t want to blame anybody, I just want to get this fixed and get back to work. Can you please put a word for me in this situation? I will write back to Support@onefinitycnc.com.
Thanks a lot,
best regards,
Charles
