I suppose that it depends on your work. I am frequently using most of my X/Y travel so I'd hate to lose even a few square inches.
> -----Original Message----- > From: Gene Heskett [mailto:ghesk...@shentel.net] > Sent: Thursday, January 10, 2019 5:53 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] tool changer with swiveling arm > > 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 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
