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Ok, I know there is an easy solution, but it escapes me at the moment.
I have always used Plum Creek for my spoil boards. Tried Trupan which didn't work at all.
Anyway, I have a 5X10 with 2 5X5 tables. With the current boards that won't cut flat. In order to cut through material at the edges I need to go 0.030 into the middle of the spoilboard.
This seems odd to me, If the spoilboard is high in the centre (it is - 1/2" or so) then when surfacing it, the centre should be thinner than the edges and I should have to cut into the edges rather than the centre when cutting melamine.
Using a 30HP 400 CFM pump pulling 10.5" of vacuum through the spoilboard and 14" vacuum with a sheet of melamine on the table.
I have never seen this before.
What am I missing?
I can't flip them over because they are fitted and screwed down.
The easy thing to do would be to make new spoilboards but this is the second set in 2 weeks that have behaved like this and my suppliers are out of 5X10 MDF - some til July.
14" sounds wrong, you should get more.
You need to fly cut both sides of the panel. The bottom also needs to be flat and to have sealer removed to get full vacuum
Is it screwed down in the center as well as on the edges? If its not screwd down in the center, the board is bowing up in the middle when surfacing, then when you place material on it its pulling a good vacuum and pulling the sb down tight to the table.resulting in a slight height difference.
I don't buy the argument that MDF has a sealed surface. It does have a finer grain and higher density on the faces but no sealer. I used to but no more surface both sides of my spoilboard. It is bolted on the perimeter and will bow with humidity change. Once the vacuum is on the spoilboard is drawn down immediately.
Wasn't the spoilboard or vacuum at all.
The top bearing on the Z axis went bad. It would cut Z depth the first cut, then Z+0.35 the second and Z+0.70 for the rest. Since I start on the corner and work in the result looked like the spoilboard was lifting.
$120 for bearings and 2 hours work and all is good.
Thanks for reporting back.