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  #121  
Old 10-10-2018, 09:23 AM
DVE2000 DVE2000 is offline
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Thanks again. Epoxy is a great suggestion. I was wondering how to glue it down.

When you add a new spoilboard do you mill it down to the plenum? Or just put glue in a grid pattern or something? You obviously canít spread glue everywhere, because itíll create an internal seal.
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  #122  
Old 10-10-2018, 12:28 PM
guitarwes guitarwes is offline
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Most people put a drop of glue on every square on the plenum and a line of glue around the perimeter and then place the surfaced side of the mdf on it.
If you have a phenolic plenum, alot of people drill holes into the phenolic, stick in threaded inserts, and use nylon screws to hold it down.
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  #123  
Old 10-10-2018, 02:47 PM
DVE2000 DVE2000 is offline
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Oy. The thought of drilling into my new baby doesn't sit well with me. O.O
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  #124  
Old 10-10-2018, 04:06 PM
The real JP The real JP is offline
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Mill or surface the plenum.
Surface the mdf
Fasten the two surfaced surfaces together.

Like Geetar Wes said drop of whatever on each square and a ring around the outside.

Seal the edges of your mdf board with edge banding, paint, glue, even painters tape works.

You might actually drill and tap a few holes for jig fixtures in the future. Sometimes it's pretty nice to work without the vacuum howling away.

Just save the drill pattern as a file so you can repeat it in the top and fixture base.
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  #125  
Old 10-10-2018, 06:02 PM
DVE2000 DVE2000 is offline
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Quote:
Originally Posted by The real JP View Post
Mill or surface the plenum.
Surface the mdf
Fasten the two surfaced surfaces together.

Like Geetar Wes said drop of whatever on each square and a ring around the outside.

Seal the edges of your mdf board with edge banding, paint, glue, even painters tape works.

You might actually drill and tap a few holes for jig fixtures in the future. Sometimes it's pretty nice to work without the vacuum howling away.

Just save the drill pattern as a file so you can repeat it in the top and fixture base.
Yeah, I got the glue part, I was just wondering what you do when it's time to put a new one on. But I guess just kissing the phenolic or a little bit short may be enough.

I will have T-slots in a couple weeks, so I should be able to use those as an alternative.

What do you guys do when cutting, say half inch baltic birch plywood? I cut some with a 1/4" Amana Spektra compression bit in 2 passes at 300ipm in the XY and 100 ipm in the Z. It came out perfectly. But I wonder if I'm being too conservative?

With 0.008 * 18000 * 2 = 288, I figured 300 was fine. Gary posted a chart somewhere that said aggressive was 0.016, which would be a feed rate of 576ipm. And at .5", conservative would be 288 * .8 = 230, and aggressive would be 460ipm.

In wincnc.ini, the axisvel r values for X and Y are 850, which is eye popping! I guess it's those upgraded motors I have. The Z axis has an r value of 400. The default XY feed value is 250, and the default Z feed is 150. Maybe I'm way underutilizing the machine... But that bit isn't cheap...
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  #126  
Old 10-10-2018, 06:38 PM
Ger21 Ger21 is offline
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I'd try to make one pass, but you may need to slow down a little. The bit will last longer, though.


Or, go with a 3/8" bit where you can do one pass, a lot faster without worrying about breaking the bit.
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  #127  
Old 10-10-2018, 11:35 PM
DVE2000 DVE2000 is offline
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I do have a 3/8Ē Vortex compression bit, so I may give that a try. It wastes a little more material, but not that much. I have a 1/2Ē bit too that I can use. I guess another option could be to use a regular router bit with a ramp. Being steel, itís probably not going to snap.
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  #128  
Old 10-10-2018, 11:45 PM
DVE2000 DVE2000 is offline
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Iím wondering if this would work instead of glue:
615836E3-6A83-43A9-9A83-D12F56169EBE.jpg
Itís double sided tape. Sticks really well. Iíd obviously have better joining tape ends, and stick little pieces of tape on the squares.
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  #129  
Old 10-11-2018, 11:01 AM
Jim_in_PA Jim_in_PA is offline
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My concern with the double sided carpet tape would be it moving over time given the forces that get exerted by a CNC machine. Normally, the tape would be used for a single cut and discarded. Holding the spoilboard is a long-term need. Perhaps with physical fasteners at the perimeter, such as nylon bolts, but I'm still dubious.

That's a really nice plenum, BTW! At this point, I'm sorta sad I didn't go that route originally, but may do so in the coming year.
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  #130  
Old 10-11-2018, 03:07 PM
DVE2000 DVE2000 is offline
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I wonder about the long term holding power too. But this tape is awesome. It had been recommended on the Shaper Origin forums by the company. It's really good stuff: https://www.amazon.com/Intertape-591...i_d_old_o0_img
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