RE: [CAD_CAM_EDM_DRO] How do I remove a Jacobs chuck from its man drel?

Many chucks will have a thru-hole, which can be seen when the jaws are fully
open.

If your chuck has one, you _might_ be able to drive the R8 mandrel out by
using a rod through the hole.
Before you try it, make up a little jig of some sort; maybe a short section
of 2.6 with a hole in it just big enough for the R8, and stand it up on some
cement blocks, and PUT A PIECE OF WOOD UNDERNEATH so that if the arbor DOES
come loose, it won't get damaged.
Then use a good, strong steel rod, and smack it HARD with a hammer.

If no hole, or if that doesn't work, you may be able to use a ball-joint
fork or even a set of chuck-removal wedges to get the chuck loose. The
wedges are small u-shaped wedges; you install them one from each side, and
squeeze in a vise, and as the get pressed together, the assembly expands in
thickness, and hopefully pushes the chuck off of the arbor.

Andy Wander
Verrex Corporation


-----Original Message-----
From: washcomp [mailto:jeff@...]
Sent: Friday, January 07, 2005 3:39 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] How do I remove a Jacobs chuck from its
mandrel?



I'd like to move my Jacobs chuck for my CNC Bridgeport from the R8
taper mandrel (JT-3) and move it to my NMTB-30 taper JT-3 mandel.

What's the best way to remove it without buggering it up?

Thanks in advance,
Jeff








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