I assume the wood you are calling black locust is in fact Robinia pseudo-acacia, so called because the leaves bear a similarity to Acacia leaves. For some reason this wood is generally (and wrongly) called acacia in the UK. These trees are often found in gardens and parks over here so often end up being available to turners.
Personally I have turned (and sold) a lot of bowls made from this wood and love to take advantage of the contrast between the heart and sap wood. It is also worth taking advantage of the little burrs it is susceptible to as features on the rims of bowls.
Small sections 3ins or 4ins in diameter I use for the little natural edged trumpet vases I make. There is one on my web site at
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(the 5th one down I think)
Larger sections 6ins or more in diameter I use for little (and occasionally quite large) natural edged bowls. see
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for a couple of examples. Both of those on this gallery have the burrs I mentioned.
You can also use the very thick bark to great effect, but to best take advantage of this you really need to rough turn it from wet and return once dried. There was a particularly spectacular example of this turned by Nick Arnull in the AWGBs 1999 top 50. see Nicks font page to see it
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The pieces you have will probably have lost 3ins or 4ins off each end but the inner part should be sound. I would use the bits up to 4ins in diameter for vas type forms and spindles and anything larger I would split in half for bowls.
Good advice to follow though is to ware a good mask and blow the dust out of the workshop or filter it, but please don't breath it is not nice stuff :-(
Hope this gives you an insight into the possibilities
Greg
Gregory Moreton RPT
Web Site
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Email snipped-for-privacy@WEMOVEmoreton.co.uk