I just bought a four jaw... Fought with it for 1-1/2 hours. I was ready to carefully remove it from the lathe and throw it thru a wall. Glad I watched your video. After learning your two key trick, it took me 3 minutes to get it dead on. Thanks.
What a great informative video. I replayed your previous one several times but your method was a little difficult to follow...this one is crystal clear. Thanks for this really useful video. I have always been in awe of Adam's insanely fast 4 jaw alignment...now we can all get close
Thank you for an excellent video, this has explained very clearly the method used, you now have another subscriber and I am on my way to the garage now to make another chuck key, regards Doc Cox.
You are certainly right about the chuck. The four jaw is the only way to be sure youi are dead on. My 3 jaw chuck has nearly 15 thousandths of run out. Thanks for the video.
Thanks for the suggestion. i measured the TIR when the lathe was new and it was 0.013" and I remeasure it recently and it is about .013. I don't think it will improve. I seldom use it unless I an going to finish whatever I do in on setting. Mostly I use the 4 jaw.
+cerberus If your chuck has a backplate you can loosen the mounting screws of the chuck to the plate while it's on your lathe and bump it around until you get the least run-out and lock it down. Also a big part is cleanliness of the mount itself. If you have a taper lock it is imperative that both surfaces are spotless. If it's a thread make sure there are no chips stuck in the threads or on the register.
+Halligan142 my 3 jaw chuck is the standard Craftsman/Atlas model. It screws on a 1.5" 8 threads per inch spindle. It does not have a back plate nor are the threads dirty.
Actually the chuck is not enough of a problem for me to go worrying over. When I do something that is going to be one piece that I can machine and part off I can use the 3 jaw if it seems more convenient. Other wise I just use the 4 jaw chuck and all is well every time.
This was a good method, very easy to get the hang of it, unfortunately I never got my piece truly indicated. I had been going mad and running in circles chasing my own tail on this and that's why I started to look at videos like this. But ehhhh, now I see that two of the chuck jaws tighten at the back first and the shaft I was using was moving a whole lot regardless of how much pressure I put on it. Sigh.
Using rings or circles cut into the face of Chuck, lining up the same places on all jaws, this will get you very close this method can be used on square as well as rectangle shapes....they were put in during the making of Chuck for a reason... bell mouth jaws can be reground in chuck with use of ring clamped on i.d.,,or taken off and surface ground using form wnheel
Great video. This must be the fastest centering of a 4 jaw I've seen, Okey, ABoom79 is fast but if he would jump up and sit on the lathe bed he could get lot faster, like You.
great explanation. I inherited an old atlas craftsman, with a four jaw chuck. I can center and cut round stock, but notice the jaws are worn. "Bell-mouthed"?... I've heard it called... where they bite in the back, inside the chuck first...and I can see light under the jaws in the front. Any ramnifications of this? Should I try to correct this... or is it a real problem? How can I fix this if I need to?
Hi, I have one doubt. Can you please explain in 4.46 minutes you told that lowest point you are setting zero. But that time dial gauge was showing 59. You turned the dial and made it 0. Plz explain me. I'm a student and trying to learn lathe machine
That chuck has a center hole Correct, why not make a Standard that fits in the hole and make the first adjustment off the standard. Set up a hard pin for fine adjustment. just saying
You lost me as soon as you clamped that magnetic base to the precision ground ways on your lathe. No professional would ever do that. And no one watching your video should ever do that.
Ummm...... Every professional I know does that and that's what it's made for. To attach to metal. Doesn't matter if it's precision or not, it's not being slid around so it's not going to hurt anything and there is no way a magnet that small can magnetize your bed.
