Material Drying
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PMMA dimensional deviation
Problem Phenomenon
PMMA precision part dimensions change with the seasons
Cause Analysis
PMMA has a large coefficient of linear expansion and absorbs moisture with slight expansion, so changes in ambient temperature and humidity cause dimensional drift; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Check tolerances of precision parts according to the temperature and humidity range of use; use in a constant-temperature environment; dimensional compensation design; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA precision parts must have tolerances designed according to the environmental range; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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