Mick
I think you have the wrong tool although there are some folks, myself
included at various times, who use a roughing gouge on bowls. I think you
need a bowl gouge or an Oland tool. There are sections on my web site that
will take you through from the log to the bowl.

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God bless and safe turning
Darrell Feltmate
Truro, NS Canada
www.aroundthewoods.com