How to ensure the relative position accuracy of the motor and reducer when installing the SCWS80-50-2 worm gear reducer

To ensure the relative position accuracy of the motor and the SCWS80-50-2 reducer, the core is to control the errors throughout the entire process from base leveling, shaft alignment to component connection through 'datum alignment, step-by-step fixing, and precise measurement' to ultimately achieve compliance with the three key parameters of levelness, coaxiality, and spacing.

1. Early preparation: setting benchmarks, selecting tools, and eliminating basic errors

1. Base surface treatment and leveling

• Thoroughly clean the installation base of the motor and reducer, remove oil stains, rust and raised debris, use a flatness ruler to check the flatness of the base, the error must be ≤0.05mm/m; if the base is uneven, use precision copper spacers (thickness accuracy 0.01mm) to level the bottom of the base to ensure that the installation surface is at the same level.

• Preliminarily fix the reducer on the base. Use a level with an accuracy of 0.1mm/m to stick to the upper plane of the reducer box and the input shaft flange surface respectively. Adjust the gaskets at the anchor bolts to make the level error of the reducer ≤ 0.1mm/m. Tighten the anchor bolts (the torque is according to the instructions, usually 20-30N·m) to fix the reference position of the reducer.

• ToolsSelection and Calibration

• Digital display dial indicator (accuracy 0.001mm, equipped with magnetic meter base), used to measure shaft system coaxiality, reducing reading errors than ordinary dial indicators.

• Caliper (accuracy 0.02mm), used to measure the distance between the motor and the reducer and the end clearance of the coupling.

• Use a torque wrench to ensure that the bolts are tightened to the specified torque to avoid position deviation caused by being too loose or too tight.

• High-precision measuring tools must be used to avoid visual judgment. It is recommended to prepare:

2. Core steps: Control relative position accuracy in three steps

1. The first step: rough positioning - determine the preliminary position of the motor

• Refer to the center height of the input shaft of the SCWS80-50-2 reducer (according to the model parameters, the center height usually matches the '80' center distance, about 80mm), and select a motor with the same center height to avoid tilting the shaft system due to differences in center height.

• Place the motor on the base, move the motor so that the axes of the motor shaft and the input shaft of the reducer are initially aligned (no obvious deviation when observed with the naked eye), and the distance between the motor and the reducer meets the design requirements (usually 10-20mm operating space is reserved to facilitate subsequent coupling installation), and the rough positioning is completed.

2. Step 2: Precision alignment - control key accuracy parameters

1. Coaxiality control (core indicator)

• Install the two half sections of the coupling on the motor shaft and reducer input shaft respectively, ensuring that the matching gap between the coupling and the shaft is ≤0.03mm, and tighten the coupling jackscrew (to avoid coupling deviation caused by loosening of the jackscrew).

• Fix the digital dial indicator on the half section of the reducer coupling, place the probe vertically on the outer circle of the motor coupling half section, slowly rotate the motor shaft for one revolution, record the maximum and minimum values ​​of the dial indicator, calculate the radial deviation (1/2 of the difference), the requirement is ≤0.05mm; if the deviation exceeds the standard, move the motor left and right to adjust until the standard is met.

• End face parallelism control (auxiliary indicator)

• Adjust the position of the dial indicator so that the probe is parallel to the end face of the motor coupling half (near the outer circle, the measurement is more sensitive), rotate the motor shaft for one revolution, record the maximum and minimum values ​​of the dial indicator, and calculate the axial deviation (1/2 of the difference), which requires ≤0.1mm; if the deviation exceeds the standard, adjust the height by increasing or decreasing the gasket under the motor base until it reaches the standard.

• spacing control

• Use a caliper to measure the actual distance between the motor and the reducer. Compared with the design value, the error needs to be ≤1mm; if the distance deviation is too large, the motor position needs to be readjusted to avoid the coupling installation being too tight or too loose due to improper spacing.

3. Step 3: Fix and review - prevent position deviation

• Gradually tighten the motor anchor bolts in 'symmetrical order'. After each bolt is tightened, use a dial indicator to measure the coaxiality and end-face parallelism again to prevent stress generated during bolt tightening that causes the motor to shift; if deviation occurs, fine-tune the motor position immediately.

• After tightening all bolts, use a torque wrench to retighten according to the torque specified in the motor manual (for example, the torque of M12 bolts is about 45-55N·m). Finally, conduct a complete accuracy measurement to confirm that all parameters meet the requirements.

3. Key precautions: Avoid common accuracy-destroying factors

1. Forcible docking is prohibited : If the motor shaft and reducer shaft cannot be easily aligned, do not use a crowbar to forcibly move the motor. You need to recheck the base level or coupling installation to avoid shaft deformation and damage to accuracy.

2. Avoid overlapping of gaskets : There should be no more than 3 layers of gaskets under the motor base, and gaskets of the same material and uniform thickness must be used to prevent uneven force on the gaskets from causing the motor to tilt.

3. Static to dynamic verification : After the installation is completed, manually turn the motor shaft without jamming, and then conduct a no-load test run for 30 minutes. Use a dial indicator to monitor the vibration value at the coupling (≤0.1mm) during operation. If there is no abnormality, it means that the relative position accuracy is stable.