I work with MDF a lot, and it's dimensional stability leaves much to be desired. I would not want to use it for a table surface if I didn't have to. It WILL warp, and sag with time, and changes in relative humidity can cause a 4x8 sheet to shrink or grow by as much as 1/8 inch. It is great for use as a fall board though and it's porosity will let the vacuum come right through.
Usually for building a vacuum table I have either used a series of rectangular aluminum extrusions, or milled a grid in an aluminum plate with some holes for plumbing. Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: Marcus Bowman <[email protected]> Sent: Wednesday, April 24, 2019 5:36 AM To: Enhanced Machine Controller (EMC) <[email protected]> Subject: Re: [Emc-users] Vacuum bed for router Re: Servo reduction for gantry machine On 24 Apr 2019, at 10:18, Les Newell wrote: > I guess you could seal it afterwards with paint. Yes, but having painted MDF before, it requires a particular sealer, then several coats of paint, which is a bit of a pain. So its a method which is lower in material cost than, say aluminium, but much higher in labour 'cost'. Marcus _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
