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| crabsign69:
how do i true up a chuck. my lathe chuck i just checked is not true i put a known straight bar in there and check it and its 20 thoyu out so i asume i need to bore it true (the jaws) so how do i go about doing this. im thinking a piece of pipe the out side diamiter of the chuck larger in size so i could put presure on it so i could then procede to bore the jaws out a littlee.. is this right or wrong. pics would be great if u got them . if not then ill just put the four jaw on and learn to love it. (probably better anyway) :dremel: :beer: |
| Rob.Wilson:
Hi crabsign69 Any chance we could see some photos of how you are checking the chuck ,,, the run out could be due to the chuck mounting and not the jaws ,, if it is the jaws ,, and they are the standard jaws (not soft jaws ) , then you will have a hard job boring them ,,, you will need to grind them with a tool post grinder ( DREMEL :dremel:). also you will have to make a small fixture so that the jaws are loaded in the correct way . Rob |
| crabsign69:
im using a spindle from a micrometer for the test bar so that should be perfect. i tried a diferent bar and it was the same results heres the pics they may be large |
| Bogstandard:
Crabsign, 1. It is a waste of time measuring the outside of the chuck, they can be almost any shape. 2. It is a waste of time measuring the outside jaws as you have them, they can be in almost any position without being clamped to something. Put a large bar in there and clock off the bar near to the chuck. 3. I would suggest you put your inside jaws into the chuck. Make sure you have the right jaw in the right slot, they should be numbered, and insert them one after another starting with #1. THEN put a piece of ground stock, or a milling cutter into the jaws, and clock off that. Only then should you mention the results. Anything up to 0.003" (3 thou) runout is perfectly acceptable on a standard sort of 3 jaw. Bogs |
| Rob.Wilson:
Try the other set of jaws ,, if the reading it the same ,,, looks like the chuck register is at fault . Rob |
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