That looks like one our our chucks, I can not quite figure out the name on the order for sure, but I looked up the city and took a guess. I won't give any info if you did not post, just to keep your name and all to yourself. Not 100% sure if this is who I think, maybe a 75/50 shot but that looks like one of our 4 jaw chucks. If its us, feel free to post if its us and details about what you have, no reason to hide anything, us and everyone can help you figure it out. We were all new at once, as long as people are polite and willing to take advice, we will help anyone.
Just a few pointers, whether our machine or not, not sure if I/you understand the mounting completely:
1. Yes, the faces of the blue arrows you drew are supposed to mount flush with each other. Nice and tight, absolutely zero gap. .001 here will cause wobble and runout.
2. The camlock studs are not supposed to bottom out, there is the groove machined around them and thats where you start as a reference point, then you go from there and adjust until your cams lock,
you want your cams to lock between 3 and 6 o clock. If its at the 6 to 12 mark like you said, its too loose. When you are at the 6 and 12, remove the chuck and screw the camlock stud in one turn, that should be the right setting. It does not matter if they are slightly different.
3. The sharpie is not really a good indicator, you need something like a feeler gage to see if there is any gap, although you can normally see it, possibly need a light. Just make sure its all going on straight and there are no burrs raised in the taper bore if it was pulley a little crooked before.
4. If he mentioned sanding anything on the taper in the chuck, I have seen them where burrs or indentations come up if you try to put it on and its pulled crooked, and it has to be just right. He was not saying to machine that down. Now it is common with a chuck with back plates, you mount the back plate to the spindle, take a cut on that, then mount the chuck. Then you are dead on with the machine. But the chuck in the pic is a one piece. No back plate.
5. Can you send or post a video? That might help. If the chuck has wobble, it seems like it is not pulling up on to the spindle all the way. I am not sure what was meant by the OD of the chuck has .0005 runout (Which is fine) but the back has .0045?
6. I do not know what you mean about the tool post in your first post, that makes it seem even more like its one of our machines since this order had a tool post on it, the tool post is a straight bolt in on this machine, nothing has to be modified on it, maybe its something different.
If it is a machine and / or chuck from us, you can also email at
tech@precisionmatthews.com and they will help, I did search the email I think it is and I have zero emails so I am not quite sure. We are here to help if needed, things can be frustrating sometimes but Ive done this 1000 times and have no problem helping out (And obviously some of the people on here too)
