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Old 08-29-2013, 11:30 AM
bobcef bobcef is offline
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Default Spoil board

I am in the process of setting up our Cobra 4848. We bought a Fugi 10 hp pump and I am looking at how to put it to use when using a spoilboard. Any suggestions welcome. Thanks guys
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Old 08-29-2013, 11:34 AM
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A 4 x 4 with a 10 hp is a good combo !!
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Old 08-29-2013, 12:35 PM
bobcef bobcef is offline
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James thanks for the reply. I can't seem to wrap my mind around how to get suction if I mount a spoil board on top of the factory board.
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Old 08-29-2013, 12:41 PM
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Mick Martin Mick Martin is offline
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Quote:
Originally Posted by bobcef View Post
James thanks for the reply. I can't seem to wrap my mind around how to get suction if I mount a spoil board on top of the factory board.
Place a 3/4" MDF on top of the factory board, turn on the vacuum the remove .010/.015 off the MDF surface. Next flip the MDF over and turn on the vacuum on again and remove .010/.015 off the surface again. Now seal all the edges on your MDF and you are good to go.
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Old 08-29-2013, 01:16 PM
bobcef bobcef is offline
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Mick are you saying that the pump will suck right thru the mdf or is it just holding the mdf coverboard down
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Old 08-29-2013, 01:32 PM
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You do have a VAC grid table right ? show us a photo and I am sure you do, you need to shin off the slick on one side of the MDF "Spoil Board" AKA "Bleeder board" then flip it over and remove the skin on the opposite side,, I am putting a new board on today and will do a new video..

Yes the vac sucks the material down on top of the mdf,, Kinda crazy to think about it but it does !
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Old 08-29-2013, 02:08 PM
bobcef bobcef is offline
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Yes we have the vac grid table. Can't take a picture because the table is loaded with tools. Wll do after I clean it off, It is sectioned of into 3 zones. Pretty cool.
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  #8  
Old 08-29-2013, 02:55 PM
eandico eandico is offline
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Bob,
Yes the vac will draw thru mdf. You must skim the slick surface off both faces of the mdf for it to work.

I will skim/surface one side of my spoil sheet then use wood glue on just the grid part of the plenum so the mdf(spoil sheet) does not get sealed over the channels of the grid and lay it into place. I then use a few drywall screws to secure it in place over night till the glue dries.

In the morning I take the screws out and surface that side and then I am ready to process sheets!!

Hope that helped a little!
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  #9  
Old 08-29-2013, 05:27 PM
rcrawford rcrawford is offline
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I wouldn't screw it. Just glue the tops of the vacuum plenum, set your surfaced MDF on top, then put a sheet of melamine board or something on top of the MDF to for a seal and turn the vacuum on for half an hour.

Only surface the one side that you are gluing down, and then surface the top AFTER it is glued down to be sure it is surfaced flat to the gantry.
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  #10  
Old 08-29-2013, 06:15 PM
Brian O Brian O is offline
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Default spoil board

Nick

At what thickness do you hog off the spoil board to replace with a new one?
I guess you also surface the black base board/plenum before you glue down the new spoil board. Have you had to replace the black plenum board yet?
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