What a weird coincidence! I'm finally getting around to a CNC retrofit of my milling machine and after buying some nice R8 tooling for manual machining, I decided to go with the Tormach Tooling System for the CNC upgrade. In theory, I can swap the TTS collet out and use my R8 tooling as easily as swapping any other R8 tools, but I'm going all in for the TTS tools and I plan on leaving the R8 to TTS collet in the spindle, so I have some new and nearly new R8 tools that I don't need and was going to sell on eBay. I had just now placed the Tormach order that included a TTS compatible 1/2" keyless chuck.
Here's the relevant segment of the post <http://linuxcnc.org/index.php/english/forum/30-cnc-machines/25580-grizzly-g1006-milling-machine-cnc-conversion?start=24#26045> that I just wrapped up for my CNC milling machine build log thread on the LinuxCNC forum: /"I took a look at my well made Polish knockoff of an Albrecht keyless chuck. I wanted to tap it out of the R8 to Jacobs taper adapter so I could buy a TTS Jacobs taper adapter and use my nice keyless chuck, but I remember that the chuck fell out of the R8 adapter, even though I thoroughly degreased the mating parts and wasn't using it to hold an endmill or any other tool that generates lateral loads. After that, I epoxied the two parts together. I guess I'll sell it on eBay as a one-piece unit, along with a lot of other nice R8 tooling I bought and used little or not at all before deciding to use TTS style tools in my milling machine after its CNC retrofit.//"// / You may not want the keyless chuck after I epoxied it to the R8 adapter, but it's a nice chuck. I think it's exactly the specifications you mentioned, 1/32" to 1/2", although it mat be 5/8". I'm still impressed that the jaws grab small diameters yet also securely grab large diameters. It has tiny drill capability for such a large chuck. And it's cheap! Make me an offer offline if interested. Include a generous post-crash good karma discount. :-) Take off another 5% for your excellent Star Wars reference. :-) I can measure the runout if you like. I can take some pictures and email them so you aren't buying a pig in a poke. On 10/30/2012 12:26 AM, 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
