The spindle of cnc router should pay attention to the following maintenance items:

1.The oil and water pipes must be connected before starting up, so that the electric spindle is connected to the oil and water pipes before starting the spindle motor.
Can be wrong. The left and right sides of the main shaft are water pipes, and the middle is oil pipes (the main shaft of CNC drilling and milling machine is grease lubricated, so the above methods are not used.)

2. When using the electric spindle, the oil mist pipe point should be connected first, and the pipe point joint should be cleaned to prevent dirt from entering and causing the bearing to burn out. During operation, the electric spindle can be started only after a slight oil mist leaks from the front end of the electric spindle. The oil mist lubrication is recommended to be adjusted by No. 5 spindle oil, and the oil inlet pipe is 20-30 drops/min. Check frequently and do not cut off the oil. Cause damage to the spindle.

3. During operation, the oil mist must be turned off after the spindle has stopped completely, so as to extend the service life, indicating that the start-up should not be too frequent.

4. Before using the electric spindle, you must check whether the grinding wheel adapter is coaxial. If the different axis exceeds 0.03 mm, the grinding wheel adapter should be returned. Otherwise, the electric spindle will be damaged and the grinding will not work well. Be careful not to impact during grinding and should be corrected. Then go in for grinding.

1. Before and after disassembly of the cnc router, end caps, front and rear nuts.

2. Push out the main shaft, rear bearing seat, linear bearing and other accessories from the front end of the shaft.

3.The front and rear bearing washers ① and the front and rear bearings of the electric spindle are matched in series with DT ②. According to the direction of the axial force borne by the bearing, support the inner sleeve, and press the outer sleeve down by hand. (The force is related to the spring on the bearing. The pre-tightening force is roughly the same). There are two ways to adjust the gap of the washer. One is to replace the bearing and the upper and lower positions of the bearing. The other is to grind the height of the washer. The parallel difference is within 2um. By adjusting the gap between the washers, the force of the inner and outer washers is uniform, and the preload on the two sets of bearings is even. ③ If the matched bearings are selected, the size difference between the inner and outer washers should be within 2um. The parallel difference of the washers is within 2um, and the bearings are installed in pairs according to the V-shaped mark on the outer diameter. ④ The long-term use of the preload spring will cause fatigue and reduce the elastic force; the preload on the bearing will be reduced, which will affect the accuracy and life of the electric spindle. Should replace the new spring of the same specification ⑤. If the gaskets are not properly matched, the load of one set of the two sets of bearings is small and the other set is too large, the bearing will be unevenly stressed and will generate heat, which will seriously affect the service life. When the force is the same, the preload load of the two sets of bearings is even.

4. Clean the bearing. The outer sleeve slopes downwards (or the inner sleeve slopes upwards) and rotates for cleaning (in clean gasoline). The bearings should be cleaned more than twice. Pay attention to the bearings after cleaning.

5. Before installing the bearing, the bearing, the inner hole of the shaft housing, and the main shaft should be lubricated with oil (special lubricating oil for electric spindle). One is to facilitate the installation, and the other is to ensure the lubrication of the bearing at the initial stage of the electric spindle

6. Clean the other parts on the shaft, the bearing should be dried naturally after cleaning, and it is strictly forbidden to blow dry with high pressure gas

7. Install the rear bearing first, tighten the nut, and fix the spring on the bearing seat with butter. The spring gland cannot be placed in the wrong position

8. Assemble the front end bearing and fix the front end cover to pre-press the bearing jacket. (Assemble the bearing should use a special sleeve, which is processed by nylon rod)

9.Tighten the front nut, install the front and rear cover, and pay attention to the position of the air inlet when installing the back cover, the sealing ring of the air inlet, the water inlet, and the water outlet should be intact and placed in the correct position.

10. After the front and rear bearings are installed, push the spindle forward from the back end of the electric spindle into position, and the linear bearing is pushed into position at the same time;

11. After the electric spindle is installed, check whether the spindle is installed in place (push the spindle forward with a wrench, the spindle will move forward, and it will rebound immediately after releasing it)