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
