Instruction/Data Sheet
Page 7
Now draw 3 circles from each centre ensuring that there is a 1/2” (13mm) gap between the circle and
the arc.
These circles will indicate the position of the 3 parts of the cloverleaf.
Now mark the size and position of the centre circle of the bowl.
Loosen the screws and remove the eccentric boss.
Undo and remove the machine screw & washer. Carefully remove the faceplate form the bi-hexagonal
locating socket and turn it through 120 degrees again to get it back to the original position.
Replace it back into the socket and re-tighten the machine screw and washer.
Replace the eccentric boss back into the main body.
Set to position ‘35’ in the sight window and ensure that line ‘1’ is in-line with the reference mark, then
re-tighten the boss screws.
Then move the toolrest to the “safe toolrest position” at the face of the wood.
Turn the first small dish outlined by the circle marked 1.
* Do not go too deep as there would be a danger of breaking through to the fixing screws *
Switch off the lathe. Check the tool finish, sand and finish the dish by hand.
Move the “safe toolrest position” at the outside of the wood.
Ensure the lathe is still set to a very low speed.
Switch on the lathe and watch the wood for a short while before starting to turn.
* Once again care must be taken when turning off centre. Approach the wood very
carefully and allow for the fact that you will only touch a third of the wood on each
rotation *
Take very small cuts with a 3/8” (10mm) bowl gouge to begin with and as experience and confidence
are gained the lathe speed and size of cut can be increased.
Regularly switch off the lathe to check for clean cut and how much more needs to be removed until
the arc is reached.
Once the outside is turned down to the mark, switch off the lathe and check there is a clean finish from
the tool. Then sand and finish this side by hand.
Loosen the boss screws and remove the eccentric boss.
Undo and remove the machine screw & washer and very carefully remove the faceplate from the
bi-hexagonal locating socket and turn it through 120 degrees as before.
Replace it back into the socket and re-tighten the machine screw and washer.
Replace the eccentric boss back into the main body.
Set to position ‘35’ in the sight window and re-tighten the boss screws.
Robert Sorby
Instruction/Data Sheet
ECCENTRIC CHUCK PROJECTS
