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Thread: A very basic segmented bowl
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28th May 2014, 06:48 PM #16
I feel a long-winded reply coming on.....
First, Michael, thank you very much for pointing this out to me. As a beginner to woodturning, this is my motivation for posting my work - the hope that those of you who know more than I do will help me to stay on the right track, pointing out where I've gone wrong or better ways of doing things.
Your feedback is very much appreciated.
When I make jewellery boxes, I use floating panels for both lid and base, so I knew that a solid bottom of any sort on a segmented turning could be a problem, but honestly thought (with my own twisted logic) that a 'pie' style base would be less of a problem than a solid base. We live and learn.
After reading your post, I did a quick search and came across a couple of relevant pdfs that cover the points you mentioned - one by Malcolm Tibbetts and the other by a collaboration of members of the AAW. I've downloaded copies for my collection.
'BASE-ics' (by AAW members):
http://www.tahoeturner.com/instructi...f/BASE-ics.pdf
'Constructing a Floating Base' (by Malcolm Tibbetts):
http://www.tahoeturner.com/instructi...ating_base.pdf
After reading your post and both pdfs, I reckon that a floating base is overkill on my current tiny projects, but I definitely should have used a solid base from quarter-sawn timber or used the 'deep dish' method as described in 'BASE-ics'.
To make matters worse, I'm almost finished a lidded box, 6" diameter, 4" tall, with both the lid and the base constructed using the 'pie' method, with 4 segments each. All I can do is cross my fingers with that one and hope for the best. I could still turn the centre out of the bottom and fit a plug, but it appears that that's not worth the effort since I could still end up with cracking. I'll keep it around for a while and see what happens.
A bit off-topic, but quite by coincidence, I spent part of the day trying to sort out a differential expansion problem on a feature band for the rim of a small plate.
It started to bow upwards in the centre. I've re-flattened it both sides and will have to let it sit for a while and see how it goes. Hopefully it'll settle down without cracking. A bit of a nuisance after all the time I put into making it.
I do still need to trim it to final width which will take 2-3mm off the outside and about 8mm off the inside, so that will hopefully relieve more of the stress.
The band:
h. Assembled & cleaned up.JPG
I love your work, too, Michael. That's the sort of thing I aspire to when I've finished learning the basics.
And once again, thank you for the constructive criticism.... Steve
-- Monkey see, monkey do --
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