The stable operation of CNC gantry guide rail grinder directly determines the geometric accuracy of key components such as guide rail surface, flat plate, and mold. In high-intensity and high-precision working environments, it may face various problems. Mastering the diagnosis and countermeasures of common problems in CNC gantry guide rail grinders is the core to ensure their stable operation.

　　Problem 1: Ripples or vibration patterns appear on the machined surface

Reason: It is mainly due to poor lubrication of the guide rail, crawling of the feed system, or failure of the dynamic balance of the grinding wheel spindle.

Countermeasure: First check the oil pressure and flow rate of the guide rail lubrication station to ensure that the lubricating oil evenly covers the guide rail surface; Clean the clogged oil hole. Secondly, check if the parameters of the feed servo system match and verify the preload force of the ball screw and bearings. Perform on-site dynamic balance correction on the grinding wheel and replace the bearings if necessary.

　　Problem 2: Decreased positioning accuracy, repeated positioning exceeding tolerance

Reason: The main causes are rail wear, increased reverse clearance, or contamination of the grating ruler.

Countermeasure: Check the straightness and parallelism of the guide rail. If the wear is severe, scrape or replace the guide rail strip. Compensate for backlash compensation through a numerical control system and regularly inspect the ball screw pre tensioning mechanism. At the same time, clean the reading head and ruler of the grating ruler with anhydrous ethanol to prevent dust interference with the signal.

　　Problem 3: There is abnormal noise or obstruction during the operation of the guide rail

Reason: Dry friction caused by chip or coolant mixture entering between the guide rail pairs, or lubrication interruption.

Countermeasure: Stop the machine immediately, remove the protective cover to check the surface of the guide rail, and use a soft cloth dipped in specialized cleaning agent to remove dirt. Check if the chip scraper is damaged and ensure effective separation of coolant and chips. It is advisable to restore the lubrication system oil supply and adjust the oil level to "visible oil film but not accumulation".

　　Problem 4: Z-axis slides down or locks poorly

Reason: Z-axis balance cylinder pressure imbalance or failure of locking mechanism (such as hydraulic lock, mechanical wedge).

Countermeasure: Check if the hydraulic system pressure meets the standard, adjust the balance valve until the weight of the slider is balanced. Test whether the locking device is in place, clean the oil stains on the locking surface, and replace the seals or adjust the clearance if necessary.

　　Question 5: CNC system alarm for "position deviation exceeding limit"

Reason: Overload of servo motor, interruption of encoder signal, or excessive mechanical resistance.

Countermeasure: Check the alarm code and verify the motor temperature and cable connection. Manually rotate each axis to confirm there is no jamming. If the problem persists, diagnostic software should be used to monitor the servo gain and feedback signal to eliminate interference sources.