Albrecht chuck - arbor change ?

I have seen a few Albrecht chucks for sale on an auction site. These almost certainly have the wrong arbor size for my machines. I might try to pick one up though if the prices remain sensible. But before I do, just wondering if anyone confirm if the arbors fitted into these chucks replaceable without loss of accuracy ? I'm just wondering if they are ground after installation to help achieve their famed accuracy.

Gerry

Some have an integral arbor so can't be changed

Look at what is engraved on the side of the chucks as that usually indicates what if any the taper mount is usually a J or B taper

Edited By JasonB on 31/05/2023 13:34:05

If it’s secondhand it may be fitted with a removable shank but be aware some have fixed shanks. As Jason says they can be Jacobs taper or screw fit on a few. I think the higher accuracy is for integral shanks where the body is ground to the taper.

According to a post by "Ron of Va" on the HomeMachinist site you need to disassemble the chuck with removable arbor to get at things :- **LINK**

http://www.chaski.org/homemachinist/viewtopic.php?t=92456&start=24

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\This is how I remove the arbor from an Albrecht Chuck. I disassemble the unit and knock the arbor out from the top. It has to be disassembled because you can’t get to the top of the arbor; the spindle is in the way.

Remove the collar.
Unscrew the Shell from the Hood, to expose the jaw guide and the body. (I used a strap wrench and a barrel vice).
Remove the Jaws, and pull the Jaw Guide away from the body and expose the spindle. Watch out for the ball bearings.
Unscrew the Spindle from the top of the body.
Support the Body, and use a punch, drift or whatever to drive out the arbor.
On reassembly, do NOT lubricate the spindle threads. Just the ball bearings, hold balls in place inside the shell with grease.

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Albrecht disassembly instructions and nice pictures of the innards here :- **LINK**

https://www.albrecht-germany.com/en/instruction/

The sleeve is easily distorted so must be carefully held. Albrecht used to have instructions for their holding tool on the sit but I can't find it now. Memory says its careful bored block wit a spilt and pinch screw to hold it evenly pretty much all round.

Worth downloading the catalogue as it has nice pictures of the various chucks sufficiently detailed to let you decide if the chuck has a fixed or removable arbor. As far as I'm aware all fixed arbor ones have the arbor appearing to grow straight out of the chuck. Removable ones will show a small groove between body and arbor.

Clive

PS  My four are all the removable type. Most likely on non-Albrecht arbors as the gap is quite large. Single sided wedge type removal tools are sold but I'm not keen on applying sideways forces to a high quality chuck. 

Edited By Clive Foster on 31/05/2023 14:07:40

Thanks chaps, really useful and timely info, as always.

Gerry

Also see this thread for a bit more info.

**LINK**