For milling sheet material on a large table, an MDF spoil board on top of a vacuum grid is usually the best option. But for small parts such as solid wood items vacuum pods are usually a better choice. In a pod arrangement with the part held directly is where the valves are useful.
Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: Leonardo Marsaglia <ldmarsag...@gmail.com> Sent: Tuesday, June 08, 2021 10:47 PM To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] OT: About a chat here on vacuum table ideas [EXTERNAL EMAIL] Be sure links are safe. Thank you guys for your answers! I've been reading and apparently MDF with a skim cut is pretty good to distribute the vacuum all around it's surface given its porosity. I think I'm gonna try that option first to see how severe is the vacuum loss when the cuts are made. Second option would be what Todd suggests, wich is a little trickier mostly because my surface needs to be 3000 mm x 2000 mm, so that's a lot of springs... I'll keep you informed as the project progresses. Thanks as always for your help :) El lun, 7 jun 2021 a las 17:11, Todd Zuercher (<to...@pgrahamdunn.com>) escribió: > It might work, but you may have trouble with the pellet sticking in > the seat and not opening when you need it to, or worse yet if your > part doen't quite seal good enough to the table, sucking shut and > losing all holding power. > > What I've seen more commonly used is a spring loaded valve where a > spring pushes the pellet(ball) up to seal the vacuum port. When no > part is in place the spring pushes the ball up to seal the vacuum > port, and the ball sticks up a bit above the part sealing surface. > When the part is placed on top, it pushes the ball down opening the > valve and allowing the vacuum to flow. > > Todd Zuercher > P. Graham Dunn Inc. > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 > > -----Original Message----- > From: Leonardo Marsaglia <ldmarsag...@gmail.com> > Sent: Saturday, June 05, 2021 11:50 PM > To: Enhanced Machine Controller (EMC) > <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] OT: About a chat here on vacuum table ideas > > [EXTERNAL EMAIL] Be sure links are safe. > > I meant to say: > > When there is a part over that hole and before the pump is on, the > pellet will be resting on the groove. As soon as the pump is on the > vacuum will be immediately sealed by the part, not allowing the > suction to suck the pellet > > El dom, 6 jun 2021 a las 0:48, Leonardo Marsaglia > (<ldmarsag...@gmail.com > >) > escribió: > > > Hello guys, > > > > I hope you're all doing well. > > > > Not so long ago (or may be yes) I recall reading someone on this > > list talking about an idea of using plastic pellets as closing > > valves for an MDF vacuum table. > > > > The basic idea was: The pellet falls into a spherical hole that has > > a round groove with a slight angle on its side. So when the vacuum > > is not applied the plastic pellet can slide thru the groove and > > leave the hole open (I imagine that the vacuum pump could be > > reversed so one can blow to clear the holes and force the pellets to the > > groove quicker). > > When there is a part over that hole and before the pump is on, the > > vacuum will be immediately sealed by the part, not allowing the > > suction to suck the pellet. Once the hole is again free, the suction > > will slide the pellet until the hole is sealed (useful to avoid > > vacuum loses on the path where the tool cuts the material). > > > > Are there any practical examples or any real life experience of this > idea? > > That would be more than useful. > > > > Thanks as always! > > > > _______________________________________________ > 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 > _______________________________________________ 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
