I'm having trouble unsubscribing my husband. Please take him off the list.
Thank you, Mrs. Ackland On Thu, Nov 23, 2023, 2:43 PM <emc-users-requ...@lists.sourceforge.net> wrote: > Send Emc-users mailing list submissions to > emc-users@lists.sourceforge.net > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.sourceforge.net/lists/listinfo/emc-users > or, via email, send a message with subject or body 'help' to > emc-users-requ...@lists.sourceforge.net > > You can reach the person managing the list at > emc-users-ow...@lists.sourceforge.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Emc-users digest..." > Today's Topics: > > 1. Re: OT: novel 3+ n axes (Thomas J Powderly) > 2. Re: OT: novel 3+ n axes (Chris Albertson) > 3. Re: OT: novel 3+ n axes (Ryan McIntosh) > 4. Re: OT: novel 3+ n axes (gene heskett) > > > > ---------- Forwarded message ---------- > From: Thomas J Powderly <tjt...@gmail.com> > To: emc-users@lists.sourceforge.net > Cc: > Bcc: > Date: Fri, 24 Nov 2023 00:33:54 +0700 > Subject: Re: [Emc-users] OT: novel 3+ n axes > I remember a customer bumping a geneva gear tool changer > > using the side of the platen that held the electrode > > bumpint would index the tool > > he used gcode on a Fanuc/Elox sink edm. > > yeah i suppose a machine tool _is_ an expensive motor > > but shows people are clever > > tomp > > On 11/23/23 04:06, gene heskett wrote: > > On 11/22/23 15:13, andy pugh wrote: > >> On Wed, 22 Nov 2023 at 19:15, Roland Jollivet > >> <roland.jolli...@gmail.com> wrote: > >>> > >>> Interesting, and it looks rigid enough for real work.. > >>> > >>> https://www.youtube.com/watch?v=4r4_uo6ZrAE > >>> https://www.youtube.com/watch?v=ztW4JIbLSMs > >> > >> Quite a clever idea for machines with closed controllers and no easy > >> way to provide motor power into the workspace. > >> > >> With LinuxCNC it's probably always going to be better to be fully > >> motorised. > >> > > I'd have to agree Andy. I need to design a disk brake for my A axis > > as there's half a degree of slop in the worm drive which if it gets to > > the motor will be held, but the slop in the worm makes for sloppy > > looking holes, but the activation method is still in my head. Even > > that is only important when drilling a hole for the handle. I'll come > > up with something. > > > > Cheers, Gene Heskett. > > > > > > ---------- Forwarded message ---------- > From: Chris Albertson <albertson.ch...@gmail.com> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Cc: > Bcc: > Date: Thu, 23 Nov 2023 11:25:20 -0800 > Subject: Re: [Emc-users] OT: novel 3+ n axes > > > > On Nov 22, 2023, at 1:06 PM, gene heskett <ghesk...@shentel.net> wrote: > >> > > I'd have to agree Andy. I need to design a disk brake for my A axis as > there's half a degree of slop in the worm drive which if it gets to the > motor will be held, but the slop in the worm makes for sloppy looking > holes, but the activation method is still in my head. Even that is only > important when drilling a hole for the handle. I'll come up with something. > > Would a simple disk brake work? I think it might clamp the part any place > within that 1/2 degree of slop range. Ideally, you would have an index > plate and some way to place a pin in a hole to lock the table. But you > could only have a few holes and not enough holes for one at every place you > might want to stop. > > What if the disk had “V” slots cut in the edge. Like a very large US > Quarter Dollar, but with maybe 360 grooves. Then you could wedge a shape > (like a tiny axe head?) into the slot and force the disk to stop on an even > degree. You could use more than one wedge, space them around the disk. > > A wedge would need a lot less clamp force than a brake disk pad because it > is a mechanical lock almost like an index pin > > If you still want a “disk brake” why not use an actual disk brake from a > bicycle? They are about the right size, have huge holding power, and don’t > cost all that much. The ones you would want to use are hydraulic so the > electric actuator could be a couple feet from the rotating table. They > still make cheaper ones that use cable but avoid those, they are too hard > to adjust. > > Or maybe both, Use the slot and wedge to aligh the table to the nearest > degree and then clamp it with a hydraulic disk brake. Cost is under $100. > > > > > > > > ---------- Forwarded message ---------- > From: Ryan McIntosh <r...@pebkac.ca> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Cc: > Bcc: > Date: Thu, 23 Nov 2023 14:11:19 -0600 > Subject: Re: [Emc-users] OT: novel 3+ n axes > If you are going to clamp a metal disc with anything, use an > electromagnet... But if it's a worm drive with that much slop, I guarantee > there's some improvement to be found by controlling the thrust movement of > the pinion gear. Inserting a shim (could be punched out of an old set of > feeler guages) under the gear where it shoulders up to the case can > probably reduce the backlash by a significant amount. > > *Ryan McIntosh* > E4F Designs > (204)770-3682 > r...@pebkac.ca > > > On Thu, Nov 23, 2023 at 1:25 PM Chris Albertson <albertson.ch...@gmail.com > > > wrote: > > > > > > > > On Nov 22, 2023, at 1:06 PM, gene heskett <ghesk...@shentel.net> > wrote: > > >> > > > I'd have to agree Andy. I need to design a disk brake for my A axis as > > there's half a degree of slop in the worm drive which if it gets to the > > motor will be held, but the slop in the worm makes for sloppy looking > > holes, but the activation method is still in my head. Even that is only > > important when drilling a hole for the handle. I'll come up with > something. > > > > Would a simple disk brake work? I think it might clamp the part any > place > > within that 1/2 degree of slop range. Ideally, you would have an index > > plate and some way to place a pin in a hole to lock the table. But you > > could only have a few holes and not enough holes for one at every place > you > > might want to stop. > > > > What if the disk had “V” slots cut in the edge. Like a very large US > > Quarter Dollar, but with maybe 360 grooves. Then you could wedge a shape > > (like a tiny axe head?) into the slot and force the disk to stop on an > even > > degree. You could use more than one wedge, space them around the disk. > > > > A wedge would need a lot less clamp force than a brake disk pad because > it > > is a mechanical lock almost like an index pin > > > > If you still want a “disk brake” why not use an actual disk brake from a > > bicycle? They are about the right size, have huge holding power, and > don’t > > cost all that much. The ones you would want to use are hydraulic so the > > electric actuator could be a couple feet from the rotating table. They > > still make cheaper ones that use cable but avoid those, they are too hard > > to adjust. > > > > Or maybe both, Use the slot and wedge to aligh the table to the nearest > > degree and then clamp it with a hydraulic disk brake. Cost is under > $100. > > > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > ---------- Forwarded message ---------- > From: gene heskett <ghesk...@shentel.net> > To: emc-users@lists.sourceforge.net > Cc: > Bcc: > Date: Thu, 23 Nov 2023 15:43:47 -0500 > Subject: Re: [Emc-users] OT: novel 3+ n axes > On 11/23/23 14:26, Chris Albertson wrote: > > > > > >> On Nov 22, 2023, at 1:06 PM, gene heskett <ghesk...@shentel.net> wrote: > >>> > >> I'd have to agree Andy. I need to design a disk brake for my A axis as > there's half a degree of slop in the worm drive which if it gets to the > motor will be held, but the slop in the worm makes for sloppy looking > holes, but the activation method is still in my head. Even that is only > important when drilling a hole for the handle. I'll come up with something. > > > > Would a simple disk brake work? I think it might clamp the part any > place within that 1/2 degree of slop range. Ideally, you would have an > index plate and some way to place a pin in a hole to lock the table. But > you could only have a few holes and not enough holes for one at every place > you might want to stop. > > > > What if the disk had “V” slots cut in the edge. Like a very large US > Quarter Dollar, but with maybe 360 grooves. Then you could wedge a shape > (like a tiny axe head?) into the slot and force the disk to stop on an even > degree. You could use more than one wedge, space them around the disk. > > > > A wedge would need a lot less clamp force than a brake disk pad because > it is a mechanical lock almost like an index pin > > > > If you still want a “disk brake” why not use an actual disk brake from a > bicycle? They are about the right size, have huge holding power, and don’t > cost all that much. The ones you would want to use are hydraulic so the > electric actuator could be a couple feet from the rotating table. They > still make cheaper ones that use cable but avoid those, they are too hard > to adjust. > > > > Or maybe both, Use the slot and wedge to aligh the table to the nearest > degree and then clamp it with a hydraulic disk brake. Cost is under $100. > > > Thanks for the ideas. In this case I think the disk brake is probably > the best idea, accuracy to the arcsecond isn't needed, just clamp it > where ever is is. I don't even have a legitimate "chuck" on this gizmo. > its a printed square socket with slightly tapered sides to corral a > square maple stick held by a live center at the far end. I can very > easily add a disk of arbitrary diameter to the front face & I'm sure I > could find a motorized driver to push the shoe and lock it for the > duration of boring the hole. > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > Cheers, Gene Heskett. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > > > > _______________________________________________ > 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
