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Old 09-17-2017, 06:35 PM
jbiddle jbiddle is offline
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Default Glue between spoil board layers?

I seem to remember people here talking about glueing on a new spoilboard to the old when it starts getting thin. We're not quite to that point yet, but I had a question as to whether I need to mill the old sheet entirely off and glue a new one down to the original milled black base (which was milled before gluing on the first spoil board)? With a vacuum system, I can't really glue a full sheet of MDF onto the flattened remaining portion of the old spoil board, right? I mean, how would the vacuum draw through a 4' x 8' layer of glue?

If you can't glue a new sheet onto the old, is the key to remove the absolute minimum of of the base when replacing the spoil board and then replace the base after however many replacements result in the base being too thin?

Do you use the spoilboard cutter to take off the last 1/4" (how thin before replacing?) of the old in one pass (2" cutter) or run it several times to get through it all?

If I'm only using 1/2" of the 3/4" MDF, wouldn't I want as thick of a spoilboard as I can buy?
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Old 09-17-2017, 09:25 PM
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Gary Campbell Gary Campbell is offline
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A few points that may help you:
You cannot use a full covering of glue to glue down additional bleeder board layers when using vacuum. Use the same pattern that was used for the initial layer onto the plenum. See vacuum class slide below.

I would mill a 3/4 spoilboard down to about 3/8 and then put on a layer of 1/2 or 3/4. If you test it, you will see better hold down with the thicker bleeder, assuming there is sufficient flow thru the board.

I would surface the spoilboard. then using a vbit at .030 deep, mark the plenum grooves, which shows where NOT to place the glue.

IF not using vacuum, use a full coverage coat of wood glue.
Attached Images
File Type: jpg Spoilboard Glue pattern.jpg (89.9 KB, 88 views)
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Old 09-18-2017, 09:01 AM
R.L.Schulz R.L.Schulz is offline
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Gary,
Do you have a Vacuum Grid Marking program for a Stinger III 4 x 8?
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Old 09-18-2017, 12:39 PM
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Gary Campbell Gary Campbell is offline
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Ron...
No I don't. Because I have never owned one. If I had I would have measured out my plenum grid and holes for the future.
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Old 09-18-2017, 03:45 PM
sgodding sgodding is offline
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When I got my Stinger several years ago I asked CAMaster for a file with the grid pattern and they provided it. Don't know if they still will do that.
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Old 09-18-2017, 03:58 PM
jbiddle jbiddle is offline
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Thanks Gary, I email support and asked them for the file. It briefly occurred to me to measure it out before applying the spoil board, but that's as far as it got.
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