On Wednesday 24 April 2019 05:18:49 Les Newell wrote: > I really like that idea. Getting the slope and pocket dimensions just > right would take some experimentation but if it works it would save a > lot of hassle. I dunno if MDF would work as a top plate though. That > stuff leaks like a sieve, especially if you cut through the outer > skin. I use 6mm MDF over the whole table as a spoil board and it > offers little resistance to air flow. I guess you could seal it > afterwards with paint.
The best sealer is shellac. 2 coats of "2 lb cut" sprayed on should do it. > PVC foam board would probably work well though > it is quite a lot more expensive than MDF. But much easier damaged than the 6mm mdf. > > Les > > On 23/04/2019 22:04, Gregg Eshelman via Emc-users wrote: > > Les > > Somewhere I saw a very clever design for a vacuum bed for a router. > > The top was in two layers instead of simply having a bunch of holes > > drilled through to the plenum each hole had a pocket off to one > > side. The bottoms of the pockets sloped slightly downward so that a > > 6mm Airsoft pellet would fit and roll away from the hole when the > > vacuum was off. Lay something flat on the bed and vacuum would pull > > on it through every hole it covered but the uncovered holes would > > suck the Airsoft pellets out of their pockets to seal them. Shut the > > vacuum off and all the pellets roll off the holes. Would be easy to > > retrofit atop any vacuum bed. Remove the original top plate and > > replace with 1/2" MDF. Use a 5mm drill in the router to make the > > hole pattern then a slightly larger than 6mm ball end mill to carve > > the side pockets. Drop in the Airsoft pellets then apply a sheet of > > 1/8" MDF and redo the 5mm drill pattern. Then the router can do any > > size work without needing to have pieces of MDF, plywood, sheet > > metal etc. to cover the unused area. ers > > _______________________________________________ > Emc-users mailing list > [email protected] > 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) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
