On Thursday 10 January 2019 17:31:03 Ken Strauss wrote: > Yes, a cute design. However, unless I missed it, he doesn't address > determining the varying stickout of the cutter. After every tool > change you would have to move the spindle to over a height setter and > then to the cutting position. A lot of time plus table real estate > used for the tool changer plus the height setter.
For the sizes of work I might want to do , unless I start carving bed head board panels, the real estate for the changer can be discounted by swiveling the carousel plumb off the bed when its all needed. As for the tool setter, a 1/4' square piece of double sided pcb superglued to the bed or even the spoil board doesn't take a lot of room, other than getting a short tool to it. On the end of the spoil board makes more sense. Lots of ways to skin that cat, the most important being to verify that the cat is well and truly dead. :-[ > > -----Original Message----- > > From: Gene Heskett [mailto:ghesk...@shentel.net] > > Sent: Thursday, January 10, 2019 5:24 PM > > To: emc-users@lists.sourceforge.net > > Subject: Re: [Emc-users] tool changer with swiveling arm > > > > On Thursday 10 January 2019 14:18:46 Martin Dobbins wrote: > > > https://hackaday.com/2016/06/20/hackaday-prize-entry-diy-automatic > > >-too l-changer/ > > > > > > ?? > > > > > > Martin > > > > Now that cute and makes use of the leverage nicely. But I do not see > > it actually change from the nut in, all I see is from one tool of x > > size shank to another tool with the same size shank. IOW, the collet > > is not being changed. But I don't see a good reason why the spindle > > motor couldn't be used to unscrew the nut and leave it behind along > > with the collet and tool, then taking the spindle to a position > > above another nut, collet and tool with a different sized shank. Its > > idea could likely be expanded to 6 or even 8 tools. > > > > A clock spring could be used to put the lazy susan back to its index > > position, and have a lookup table that would then tell the gantry > > where the next tool lives. Drop the spindle into that gatersocket, > > spin the spindle until its semi snug, and drive the suzan to finish > > the tightening. Humm, small motor to preposition the empty socket in > > the wound up position would be even better, the drive the gantry to > > loosen it and turn the motor backwards to complete the unload. > > Reverse to load. > > > > I like it. But how does he position the motor so the wrench just > > slides in? Or is it under power, say at 5 hz to do that. > > > > Most of these motors haven't an encoder to facilitate the alignment. > > > > Most of what I might do could be handled with 3 tools at the ready > > in a 4 station wheel and one in the spindle for starters. If more > > tools are needed it looks super easy to exchange all 3 in the wheel. > > This puts the onus to remember what you are doing on the operator, > > but this is what we have (msg,text to print) for. > > > > > ________________________________ > > > From: Gene Heskett <ghesk...@shentel.net> > > > Sent: Thursday, January 10, 2019 12:43 PM > > > To: emc-users@lists.sourceforge.net > > > Subject: Re: [Emc-users] tool changer with swiveling arm > > > > > > On Monday 07 January 2019 05:22:53 andy pugh wrote: > > > > On Mon, 7 Jan 2019 at 05:07, Gregg Eshelman via Emc-users > > > > > > > > <emc-users@lists.sourceforge.net> wrote: > > > > > I've seen some that have each tool holder coded and read the > > > > > holders in the chain or carousel as it moves. > > > > > > > > In fact the machine in the first post is just such a machine. > > > > The tool holders all have a mechanical bar-code made of a stack > > > > of rings of different diameters on the outside of the tool > > > > holder body. > > > > > > I have spent some time daydreaming about a tool changer that > > > changes the whole ER-11 for use with this gantry mill. Something > > > that changes the nut, collet and tool all in one swell foop. \ > > > > > > Obviously one would have to motorize with enough force to > > > adequately tighten and loosen the nut, but spinning the nut on and > > > off with a short burst of the spindle motor. > > > > > > Where I hit the rude awakening is in positioning the two wrenches > > > independently, in order to exert enough force to get an adequate > > > grip on the tool. I can visualize tickling the motor till the top > > > wrench snaps onto the spindle double d flats but then possibky > > > pushing the top wrench into engagement key/spline. The nut wrench > > > has to be articulated so it snaps into place later. That would be > > > helped if it was a 12 point socket. But then we may need 2 or 4x > > > the torque to loosen it as it took to tighten it. And because the > > > tool may slip in and out of the collet while the nut is loose, > > > some means of driving the tool back into the collet to a fixed > > > projection, then some additional time to measure the stickout sure > > > seems like a good idea. > > > > > > That may yet make me learn a cad program. Fugly thought, that. > > > > > > Cheers, Gene Heskett > > > -- > > > > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Cheers, Gene Heskett > > -- > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
