hello guys!
I tried to look through this forum, I couldn't find a similar thread about this.
So I bought another 2nd hand OKK VMC, Boxway , 16im control.
On the parameter's book, there is a section mentioning Softscale, I am not sure what that is and if is affecting the x-axis.
The machine configuration is head moves along the x-axis, and on z up and down, then the table moves on Y back and forward.
ATC, Spindle, and Z and Y axis seem quite good as well as the overall condition, but I think there are several problems with the X axis.
There were no noticeable noises until I machined a boss and came out of round by 0.004/0.005".
When the machine is off there was a play on the ballscrew , I could turn by hand a few degrees clockwise/counterclockwise.
Measured the backlash on X , it was with a clock and I made it around 0.004"/0.005".
We measured the slop on the ballscrew it was about 0.002".
I had my engineer in, and he thought Thrust bearings needed to be replaced, we replaced them with exactly the same ones and the problem was identical.
We then measured the housing bearings which seemed to be 0.008" deeper than the bearing thickness, we shimmed this and got almost no play/no slop on the ball screw.
I then measured the backlash and we are around 0.0025/0.003" which is still a lot, now Also, I am not sure why, perhaps because we shimmed the bearing, the machine is making a vibrating noise possibly coming from the motor, which it does not make me very comfortable to make further tests.
I am going to have the screw refurb, hopefully, this will fix the problem, but I am not totally sure.
To make this even more confusing, there is a high value on the x-axis backlash comp from the factory, something like 135, although these numbers they can be high numbers on higher resolutions motors/machines.
This machine has also several highspeed machining options like g05 p10000 and so on.
I have the original test report of the machine from the factory, and all the tests seemed between 0.00015/0.00025".
Also on the boss I machined, although there were big marks where the x-axis changed direction, the finishing looked still really good.
I hope someone can point me in the right direction.
I tried to look through this forum, I couldn't find a similar thread about this.
So I bought another 2nd hand OKK VMC, Boxway , 16im control.
On the parameter's book, there is a section mentioning Softscale, I am not sure what that is and if is affecting the x-axis.
The machine configuration is head moves along the x-axis, and on z up and down, then the table moves on Y back and forward.
ATC, Spindle, and Z and Y axis seem quite good as well as the overall condition, but I think there are several problems with the X axis.
There were no noticeable noises until I machined a boss and came out of round by 0.004/0.005".
When the machine is off there was a play on the ballscrew , I could turn by hand a few degrees clockwise/counterclockwise.
Measured the backlash on X , it was with a clock and I made it around 0.004"/0.005".
We measured the slop on the ballscrew it was about 0.002".
I had my engineer in, and he thought Thrust bearings needed to be replaced, we replaced them with exactly the same ones and the problem was identical.
We then measured the housing bearings which seemed to be 0.008" deeper than the bearing thickness, we shimmed this and got almost no play/no slop on the ball screw.
I then measured the backlash and we are around 0.0025/0.003" which is still a lot, now Also, I am not sure why, perhaps because we shimmed the bearing, the machine is making a vibrating noise possibly coming from the motor, which it does not make me very comfortable to make further tests.
I am going to have the screw refurb, hopefully, this will fix the problem, but I am not totally sure.
To make this even more confusing, there is a high value on the x-axis backlash comp from the factory, something like 135, although these numbers they can be high numbers on higher resolutions motors/machines.
This machine has also several highspeed machining options like g05 p10000 and so on.
I have the original test report of the machine from the factory, and all the tests seemed between 0.00015/0.00025".
Also on the boss I machined, although there were big marks where the x-axis changed direction, the finishing looked still really good.
I hope someone can point me in the right direction.
