I don't use a drill chuck on any of my mills, I've been told ER collets are much better and that is what I use. A little googling and it looks like the NMBT30 can be modified to fit the QC30 with the only difference between the 30's is the flange and drive lugs.
http://www.tools-n-gizmos.com/specs/Tapers.html On my BP with Kwik Switch tooling and the tool changer is subject to being distracted from time to time I have a little rack with numbers and I pull from the rack if there is more than 1 tool change. John On 10/29/2012 11:26 PM, Sebastian Kuzminsky wrote: > Bone headed error... I am doing a small production run, using three > different drills, each mounted in its own tool holder. I had carefully > measured the length of each tool and recorded them all in the tool > table. I had run about 10 parts, everything was going great, just a few > left to go. > > Then I got distracted and loaded the wrong tool... Unlucky for me, the > tool I loaded was much longer than the tool the machine asked for, and > the machine happily drove a drill chuck with a #39 drill right into the > work. > > The drill shattered and disappeared in a spray of shrapnel (no one was > hit). The jaws of the drill chuck drilled about 0.100 inches down into > the work piece (soft aluminum, fortunately). The Z servo finally > signaled a following error and e-stopped the machine. The work and the > fixture plate absorbed all the damage, the table of the machine is still > unmarked. So it could have been worse. > > But the chuck is completely ruined. It used to be a pretty nice keyless > chuck, 1/32" to 1/2" gripping range, J6 taper. Now it's garbage: the > body (what I would normally turn to tighten and loosen the jaws) turns > very reluctantly, and the jaws don't move at all when i turn it... > > I got it off the J6 tool holder, and the J6 taper on the tool holder has > ~0.001 inches of runout now (measured with a DTI on the taper, while > mounted in the spindle and turning slowly). I don't know what the > runout was before the crash, and I don't know what's acceptable. Does > this seem reasonable, or should I scrap the tool holder too and look for > another? My spindle has a QC-30 taper, which is somewhat unusual - tool > holders like this can be hard to come by. > > In either case I need a new drill chuck. > > The wrecked chuck is of the keyless variety, and while that's convenient > I'm considering replacing it with a keyed chuck because they tend to be > shorter, and my quill is a bit limited in Z travel. Why do CNC machines > usually have keyless chucks? > > What do you all recommend for a good value on a drill chuck, about 1/32" > to 1/2", J6 taper? > > Keyed or keyless? > > Help me emc-users, you're my only hope! > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
