All rotating machines, no matter how designed and manufactured, generate vibration during operation. Excessive vibration will shorten the service life and even cause damage to the machine.
When excessively vibrating components are connected to other equipment, in addition to affecting their own operation, vibrations will also be transmitted to other equipment through the connected components, thereby destroying the entire operating environment.
What we usually call dynamic balancing is essentially to reduce vibration.
Especially when the machine is running at high speed, sometimes we can clearly feel the vibration, accompanied by harsh noises. The spindle will heat up in a short period of time, and small-diameter tools used for processing may accidentally break during high-speed rotation due to spindle vibration, or produce unacceptable tool marks on the surface of the part.
This unbalanced state is caused by the deviation of the center line of mass of the rotating component from the axis of rotation.
On Haas's spindle assembly line, 2 dynamic balance debugging and testing will be carried out according to the dynamic balance standard of G2.5 to ensure the safe and long-lasting operation of the spindle.
In addition to the spindle itself, the user's use of tool holders or tools that do not meet dynamic balance standards may also be the cause of imbalance. When using small-diameter tools for processing, due to the linear speed, the spindle needs to run at a high speed to perform normal drilling or milling. Using a tool holder that does not meet dynamic balance standards will cause accelerated tool wear and affect processing efficiency. Running in this way for a long time will accelerate the wear of the spindle bearings and increase the maintenance cost of the machine.
*Extra long, oversized, and overweight knives are not allowed!
*For personal and property safety, please strictly abide by the warnings on the machine sticker!
Methods to use your hands to sense vibration to reduce spindle vibration:
1. Install the best balanced tool holder you can find on the spindle, run the spindle at the highest speed, and feel the vibration with your hands.
2. Remove the spindle protective shell.
3. Loosen the fastening bolts of the spindle motor, and then run the spindle at a speed of 750RPM to allow the spindle and motor to align themselves, then slowly tighten the bolts, and then fully tighten to the specified torque.
4. Feel the vibration with your hands again. If the vibration issue is not resolved, continue to the next step.
5. Number each threaded hole on the guide release ring.
6. Use the matching set screw set, starting with the shortest screw, and screw this screw into each threaded hole in turn (be sure to screw it to the bottom of the thread). By comparing the vibration state at the highest speed, find the threaded hole with the smallest vibration.
7. In the threaded hole you find, try different lengths of set screws and select the most suitable set screw by comparing the size of the vibration.
8. If the vibration problem is solved, remove the set screw, apply lubricant and put it back (to prevent rust).
9. Reinstall the spindle protective shell.
(Source: Haas CNC Machine Tools)