fubar
9th June 2014, 09:48 AM
Straight up no photos so this didn't happen.
I've now blown up 2 burls first one was a small piece 5cm across and 12 cm long looked to have an egg hiding in it so screw mounted with live centre other end, used a roughing gouge to get near shape then spindle gouge to finish, end polished up nicely, reversed the piece put into matching cup bring up live centre begin turning with roughing gouge and kaboom snapped I think into 3-4 pieces flying throughout the shed shattered into lots of tiny pieces.
Second one was 20cm across and about 12cm deep I decided on a natural edge bowl. I mounted it the same way, first heavy bit of gouging and the thread tore in the burl, remounted slightly off centre and gingerly cut out a foot mount, it cut and then polished up ok. Then I mounted into step jaws and was able to get a nice shape and finish on the outside. Started gouging out centre got wall thickness to 8 mm started using scraper got to about 5-6mm and kaboom left with foot in jaws and pieces no larger than 2cm spread throughout shed.
Each time the tools were sharpened first.
Question am I unlucky to have had 2 unstable burls? or is there some special technique to mounting and working aussie burls ? I have watched utube with no enlightenment.
thanks Dennis
I've now blown up 2 burls first one was a small piece 5cm across and 12 cm long looked to have an egg hiding in it so screw mounted with live centre other end, used a roughing gouge to get near shape then spindle gouge to finish, end polished up nicely, reversed the piece put into matching cup bring up live centre begin turning with roughing gouge and kaboom snapped I think into 3-4 pieces flying throughout the shed shattered into lots of tiny pieces.
Second one was 20cm across and about 12cm deep I decided on a natural edge bowl. I mounted it the same way, first heavy bit of gouging and the thread tore in the burl, remounted slightly off centre and gingerly cut out a foot mount, it cut and then polished up ok. Then I mounted into step jaws and was able to get a nice shape and finish on the outside. Started gouging out centre got wall thickness to 8 mm started using scraper got to about 5-6mm and kaboom left with foot in jaws and pieces no larger than 2cm spread throughout shed.
Each time the tools were sharpened first.
Question am I unlucky to have had 2 unstable burls? or is there some special technique to mounting and working aussie burls ? I have watched utube with no enlightenment.
thanks Dennis