Hi MadMax
You are right sometimes the ring on the outside can give you a bad bore only if the chuck is in bad shape the other way to do it is clamp on a short piece of bar & place this at the back of the jaws bore the hole size you want up to the piece in the jaws now that you have the bore you want take the piece of bar out of the chuck then bore the back of the jaw with a slight under cut making the bore at the back of the jaw were the piece of bar was a little bigger dia & when clamping on a piece like this only use enough pressure to get the job done to hold the piece of bar in place
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Mactec54 |