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| Making an accurate spindle with an innacurate chuck. |
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| lordedmond:
Pekka the jaws are the only thing that the work touches ( unless you knock it back to the body ) so that has to be the datum to machine any fix from ( at this stage not when it was manufactured ) so mounting it on a bar with the jaws is the only way to ensure that any machining will be true to the jaws If Simon was near to me I would have it fixed in 10 mins ( it would be Ok but with those loose jaws it is never going to be perfect ) but it would be a lot better than it is now Stuart |
| PekkaNF:
--- Quote from: lordedmond on November 24, 2013, 03:56:56 AM ---... the jaws are the only thing that the work touches ( unless you knock it back to the body ) so that has to be the datum to machine any fix from ( at this stage not when it was manufactured ) so mounting it on a bar with the jaws is the only way to ensure that any machining will be true to the jaws .... Stuart --- End quote --- I agree on your logic. That is the standard way of making four jaw chuck workable, but I'm not sure if it enough on this particular case. Here the jaws are "trued" to wobbly chuck (see opening post). Therefore jaws are not true to jaw ways. I know that this is not normally big issue, but this might be one wonky chuck. Therefore I would first true back of chuck register to jaw ways and then true jaws to chuck body and chuck body front as well. It would make using it so much easier or write it off completely, but this is not a heirloom chuck. Or am I missing here something? Pekka |
| awemawson:
As Simon has ground the jaws, unless Chronos will replace the chuck I think the best course of action is first and foremost install new jaws. Then using those grip a large bar that is centred at each end with the jaws, and run it on centres allowing you to face the rear to truth relative to the jaws, which is all that is important. This can be done on another lathe. Then re-fit the back plate having trued it on the target lathe. (If you've taken too much off the back !plate for a good register fit, convert it 'Griptru' style !) Andrew |
| S. Heslop:
--- Quote from: PekkaNF on November 24, 2013, 05:38:42 AM ---or write it off completely, but this is not a heirloom chuck. --- End quote --- I think this would be the way to go with how loose the jaws fit in the tracks. I'll probably be able to find a use for this one for workholding in stuff like welding, or whatever comes up. I've found 4 jaws can get a real good grip on square and round objects without marking them, so it'll be good as a vise for hand tapping the ends of bars as well. |
| lordedmond:
Simon I do think that is the correct thing to do repurpose it for other uses so it is not a complete write off of your cash keep your eye open for something like a TOS good luck Stuart |
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