Hi Chas .... see this 'moving and cracking' effect that you're referring to -- is it something that will usually happen withing a relatively short period , say a day or so or can it on occasions take longer , i.e weeks or even months ?
Is there any way that one could 'predict' it when looking at the 'raw' blank ?
I haven't been doing this long... and just last week turned a bowl in a wood which I
think was called Mascarponia or something very similar to that spelling.. quite a light coloured wood, and it gave off quite a pungent smell when worked... it seemed to really 'go for' the back of the nose / throat..... well - all seemed fine when I looked at it before mounting to the machine..... I've not maybe got what could be called an 'experts eye', but certainly no visible defects that i could detect... and it didn't get subjected to any 'shock loading' from any catches or anything, and all seemed well through the turning, sanding, and subsequent application of a clear bri-wax finish and buffing by hand.... but since then, its slowly been cracking and becoming somewhat oval.. not a huge amount oval, but enough that the eye can detect it... it no longer sits flat, but rocks about on its foot, quite badly too ! its splitting right through, from inside to out... any thoughts or 'lessons' i could or should learn here ?
I should add maybe ... its about 8" Diameter, about 2" high, uniformly thick at say, 6mm ... flat bottomed, with a trapezoidal outwards taper from base to top, plus the small typical foot on the base for fitting into the chuck on expansion.
It came from my usual Hardwoods source.... all fully dried & seasoned etc..
I'm probably missing something obvious ...but wondered if you or anyone else would have any thoughts .... as I say - it turned nicely.., apart from the smell which was very distinctive, - didn't look defective upon completion, and hasn't been put anywhere 'silly', its been left in the house at normal room temperatures, not in any direct sunlight or anything either.
Just have to make a quick reference to the 'novice lady turner' too... If i may - she's turning out some mighty impressive quality for just being at it for 2 months... "well done, that girl ! " , thats looking pretty damn fine stuff.... ! very encouraging for another learner, here ! 8) 8)
Thanks - oh and happy new year to everyone here, too