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Box lids warping

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BrianH:
As well as the drying out movement mentioned above, it is also important to consider that parts of trees grow with various inbuilt stresses, due to wind resistance, weight of branches, etc. These stresses will need time to work themselves out. This is why things like top end snooker cues spend years in the making, most of which is waiting time.
It's also worth mentioning that only other woodturners are impressed by tight fitting lids!!!
Brian

Bill21:
It may be worth you getting a book on the topic for relevant tips etc.

https://www.abebooks.co.uk/servlet/BookDetailsPL?bi=30591820419&ref_=ps_ggl_2039220669&cm_mmc=ggl-_-UK_Shopp_Tradestandard-_-product_id=UK9780764330278USED-_-keyword=&gclid=CjwKCAiAjrarBhAWEiwA2qWdCHwZ_eCoBoPdpHgGxt6VIosaCamWzTh2huuvp-Ce0KuFlgOFLmpg-RoCZD4QAvD_BwE

Paul Hannaby:
The wood is shortening across the grain rather than lengthening along the grain.

If you want stable boxes with good fitting lids you need to stabilise the wood in the environment it is intended to live - so in the house rather than in the workshop. Then take the wood back to the workshop when you turn the box but don't leave it there long enough to readjust to the increased humidity.

Also worth bearing in mind is that wood can release inbuilt stresses and distort as it is cut even if fully dry so to be absolutely sure, rough turn the box as well as acclimatising it.

End grain boxes have a higher chance of remaining circular but that can be variable depending where the blank was cut from the log.

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