I have a problem in Z axis flexing

[Peruanzon]

I have had this problem since I got the machine and I would like to know what is the solution to this.
Please watch the video, thanks




Similar Threads:

• Problem- X axis flexing while milling
• Need Help!- X Axis flexing while milling
• 20mm Shafts flexing
• Problem- VF-10 Table Flexing
• How long before flexing for Acme 1/2-10?

[Andreiir]

That is normal , the flex depend on machine rigidity ,on rails used, if they were rolers then u wouldnt have this flex , but with balls u have flex , and that depend and with machine base rigidity and weight of the machine , u cant get a high rigidity with a low weight machine , u need iron cast and high mass dapening weight in order not to flex that much .

[Peruanzon]

Andreiir I appreciate your reply, if my machine has linear guides and I was thinking maybe I would have to tighten a screw, but I have not because I consider myself very new.

I've also been thinking about swapping out the spindle motor for a stiffer one, do you think that can reduce flex?

my machine is not small because its weight is around a 1 ton

[Andreiir]

I see that ur support of motor stays on a thick aluminium plate u need to be shure that the motor support stays near cariages of axis for beast rigidity , a plate of aluminium without any lateral support will flex too .
on a cnc machine u need to see what is the weak point that flexes more and there u need to improve the stiffness .

[Andreiir]

About the motor i think u need a motor that suits ur needs , for milling aluminium u need high rpm and not big hp , a 2.2kw will work fine , but if u want to go on steel u need a low rpm and high torque .

[Peruanzon]

I see that ur support of motor stays on a thick aluminium plate u need to be shure that the motor support stays near cariages of axis for beast rigidity , a plate of aluminium without any lateral support will flex too .
on a cnc machine u need to see what is the weak point that flexes more and there u need to improve the stiffness .

I'm sure the bracket is cast iron, but I'm going to use a magnet to check.

Regarding the carriages, I have recorded a new video where you can see the measurements and their maximum route:

[Peruanzon]

I have also done a new flex test to the rail guide and base plate



I would like to know your opinion and that of other experts to understand more about cnc machines and solve problems. Thanks