I have a 40hp oil ring pump, you have two 10hp carbon vane pumps, others use different types of systems, and horsepower on 3' x 8' tables all the way up to 5' x 22'. Regular MDF or light MDF just do not work for me. More air is passing through the spoilboard and making contact with the sheet I want to hold! I have 2-10HP pumps, 27" mercury on my 5x12 table. With the ultra light, I grab with two hands and can't lift the corner! A lot more holding power. I put a melamine sheet on it, and I can lift the corner with one finger. With the Plum Creek light, after machining the shit out of it, I still have 19" of mercury with the table open, no sheets on it. I put a sheet on it and I get 27" of mercury, excellent holding power. Lots of air volume passing through the sheet. I had 6"-8" of mercury with the Uni-Board ultra light with table open, no sheet on it. I have tried Plum Creek light MDF, fly cut the bottom 2mm, fly cut the top 6mm, but am still not having the holding power of the ultra light MDF. There are other suppliers such as Trupan ultra light and Weyerhaeuser Premiere. ![]() I'm having a hard time locating this product or any other ultra light MDF. It came from Uni-Board, is an ultra light MDF, and works great. Spoilboard never lifts, so no chance of fine chips getting underneath and sucked into the vacuum filter when you turn it on. I bet his vacuum filter stays pretty clean. I do what contributor J does, but if I had my choice I'd do what contributor M does. This keeps the board in place 24/7 and I never have to flip it to machine the other side. When finished machining my spoilboard, I attach the MDF to the grid table with 6mm plastic screws. When dressing my spoilboard, I drill and counter-bore holes in my spoilboard where the bolt holes are. I removed the screws in the corners and in the middle of each table. I have a phenolic grid table under my spoilboard that is fastened to the aluminum vacuum plenum by 6mm cap screws. It'll stay flat for a while, then when it starts to curl again, flip and fly cut again. Without actually fastening it down, the best way I've found is to flip it over and fly cut the other side when it starts to curl. ![]() Is fastening the spoilboard down an option - maybe with nylon screws? ![]() However, when we are running a smaller sheet, it sometimes won't vacuum down. Generally it's not a problem because putting a sheet of melamine on it lays it down. What is the best way to keep a spoilboard flat? Our spoilboard tends to curl up on its ends.
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