I purchased this chuck with an R8-JT6 arbor about 20 years ago. It has a chuck capacity of 1/32-1/2in (1-13mm) stamped into the shell along the the Albrecht badging and country of origin (Germany). I completely disassembled it and would like to replace the arbor. Albrecht table shows three models in the Classic series (assuming that is what this is) with 1/32-1/2in capacity: 130-J2, 130-J6 & 130-J33. The JT6 never seemed to maintain concentricity with long drill bits. There are no other unique identifiers I could find. Any reasonably knowledgeable machinist care to speculate which arbor fits this keyless chuck?
I could also use a recommendation on drill chuck removal wedge set for removing the arbor without resorting to the open-end wrench method.
First of all, welcome to HM.
Not being all too knowledgeable about much and not really being a machinist, I would however like to speculate that a decent arbor from Albrecht or Jacobs (made in England) or Rohm would probably work well provided it is installed correctly. Assuming the female taper in the chuck is good, it is not the arbor taper that is usually the cause of excessive run out because they are precision ground to a standard, at least by reputable makers. Rather, it is usually the care with which the arbor is installed that makes the difference. Furthermore, the lack of concentricity of a drill bit has more to do with the drill than the chuck, at least in my experience. An Albrecht chuck in good condition should hold less than 0.02mm TIR, which is fair for a drill chuck, but it is measured with a precision pin.
Now, Albrecht arbors can be quite accurate when used in an accurate spindle. My personal drill press had under 0.0005" TIR
at the arbor (an Albrecht arbor) after I replaced the spindle and drive sleeve bearings with precision bearings so I know their arbors are quite accurate. Drills held in my Albrecht chuck look like static pins when running but I do not bother measuring the run out at the drill because this has little meaning due to stacking tolerances, regardless of drill size. If you must have good concentricity with a drill then you need to use quality drills and hold them in a collet or heat shrink them into a tool holder.
Insofar as wedge sets, Jacobs makes some or you can make your own. Albrecht also makes chuck removal tools to ease removing a chuck from the arbor. You can also cut off the bulk of the arbor and use a puller to pull it out of the rear of the chuck body. You can also try to use a pin inserted into the body from the front and a hydraulic press to push it out; if you do this, slip a thin-walled tube in there to protect the spindle threads before applying force.
So, buy a good arbor and install it correctly. You have a good chuck and it deserves it.