Chuck not aligned?

[karambolista]

I was going to install a new tip using a Porper Mini Q-Lathe and after I mounted it on the lathe and turned it on the ferrule was wobbling as it spun. I also used a 13mm shaft collet that came with the lathe on my 13mm ferrule.

What would normally be the problem when the ferrule end of the shaft wobbles as it spin?

 

[Murray Tucker]

I was going to install a new tip using a Porper Mini Q-Lathe and after I mounted it on the lathe and turned it on the ferrule was wobbling as it spun. I also used a 13mm shaft collet that came with the lathe on my 13mm ferrule.

What would normally be the problem when the ferrule end of the shaft wobbles as it spin?

Very common problem. I have a Buck chuck on my shaft lathe. A few seconds with a dial indicator and I can get it running true. The chuck is about 500.00 before you get it mounted. A cheaper alternative is to learn to trim the tip with a utility knife blade. Sheldon posted a video of this a while back. Look at this thread: http://www.azbilliards.com/vbulletin/upload/showthread.php?t=21250

 

[Canadian cue]

A friend of mine recently purchased this lathe and was having similar problems. The problem was not the chuck. The problem was in the mounting. Chuck up a piece of steel ( approximately 1\2" dia. and a couple of inches long). Have it stick out of the chuck an inch or so. Now loosen the screws which are holding the chuck to the mounting plate (you want them to be just loose enough so that you can move the chuck around a little). Now using a dial indicator run your dial on the steel you have in the chuck and tap the chuck until it runs true. Then tighten up the screws. Those little Bison chucks are good little chucks and if you do not abuse them they should run within a couple of thou for many years.

 

[blud]

back plates

I was going to install a new tip using a Porper Mini Q-Lathe and after I mounted it on the lathe and turned it on the ferrule was wobbling as it spun. I also used a 13mm shaft collet that came with the lathe on my 13mm ferrule.

What would normally be the problem when the ferrule end of the shaft wobbles as it spin?

Most lathe's are fine, but you run into the problem of RUN-OUT. On any of my lathe's, I machine the back plate ON THE LATHE, it's to be used on. By machining tyhe back plate to the inside dia, of the back of the chuck, you going to be real close. Next problem could be, the jaws have run out. All the jaws on cheap chucks and some of the high end ones may need to be "ground" in place also. The smaller 3" chucks like on your porper, machine are fairly enexpensive, and are not to bad for run out, considering the cost of them.
You should be able to over size the hold down holes on the back plate and use a solid rod chucked up, and a dial indicator and get dead-on..
Some times you have wooble and it's caused by the back plate that is not SQUARE, TO THE BED.Remove the chuck, and then, Re-face the back plate, and work from there.
blud

 

[Murray Tucker]

I was going to install a new tip using a Porper Mini Q-Lathe and after I mounted it on the lathe and turned it on the ferrule was wobbling as it spun. I also used a 13mm shaft collet that came with the lathe on my 13mm ferrule.

What would normally be the problem when the ferrule end of the shaft wobbles as it spin?

Here is a tidbit that I recieved from a Porper user. Seems that Joe machines the threads on his adapters very loose and uses three set screws to fine tune it so that there is no run out. Take the chuck off the adapter plate and then use a dial indicator to check the adapter. If it is off then fine tune it with the set screws. Put the chuck back on and check it for run-out. Repeat until it is running true.