On 6/4/2015 5:58 AM, andy pugh wrote: > On 4 June 2015 at 08:22, Peter Blodow <p.blo...@dreki.de> wrote: >> To make sure, if you own a high speed grinder of the longitudinal >> (Dremel) style, have the jaws open a little less than the size of the >> bore of the chuck body. Then mount the grinder on the tool post somehow, >> run the lathe at highest speed and move in and out until there are no >> more sparks. > That only works for that exact diameter, though, unless you assume the > scroll is perfect. > Incidentally, clamping wood between the jaws is probably better than > trusting centrifugal force. > Post 19 here has a neat quick-and dirty version of the same idea using > bits of angle iron: > http://www.practicalmachinist.com/vb/general/how-do-you-grind-chuck-lathe-157098/ > > Even on the three-jaw version the curve of the teeth on the jaws can > only match the scroll at one diameter. > In fact, the more I think about them the more convinced I am that that > they can't possibly work :-)
I think the entire thing (the chuck assembly) jams together and that is why you don't hear things flopping around inside your chuck. The scroll is behind the jaws. The jaws stick out in front of the chuck yet are retained in grooves. The scroll moves the jaws in and out at the rear surface of the jaws and when the jaws touch the material they are cantilevered in the chuck body. The scroll jams the jaws into place creating a locking assembly. At least that is how I "think" they work. How else could they operate?? >>In fact, the more I think about them the more convinced I am that that they can't possibly work :-) Bummer... I wanted to use my lathe.... ;-) Dave --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
