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Thread: 4'x8' vacuum table build questions

  1. #13
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    Default Re: 4'x8' vacuum table build questions

    Quote Originally Posted by Gary-Wiant View Post
    Sean this is what I am calling the vacuum gate.


    The electrical is way way over my head. I have a buddy that is an electrical engineer figure it out & wire it up for me.

    Thank you
    Gary


    Is the relief valve plumbed into your common area or do you have 1 on each motor?

    I'm assuming the pressure valve is also plumbed into the common area. And I think we are setting up our tables differently It looks to me like you are using you motor box as your common area mine will look similar to this rough sketch I did freehand on my phone but I think it shows what I'm doing.
    4'x8' vacuum table build questions-_190106_182800_248-_1-jpg
    Gary you are correct, the relief valve and gauge are both plugged into the common area between your valve sets. My homemade check valves are just automatic versions of your manual valves on each motor. I tend to get a bit OCD on control systems, and tend to make them as idiot proof as possible (including the primary idiot-myself). It is a carryover from my profession, that is I’m also a EE specializing in control systems. So if I can make it foolproof enough for myself, it ought to be good enough for anybody that comes to my shop??
    Enjoy your machine, and post pictures of it in action when you get it completed
    Cheers
    Sean



  2. #14
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    Default Re: 4'x8' vacuum table build questions

    Well I've officially started on the vacuum table build. I sanded both the top of the 3/4" MDF base and the bottom of the Excel IF 1" PVC and applied heavy duty liquid nail with a v grove trowel then laid the PVC directly down onto the MDF and used so home made caul clamps to clamp them together.

    I have included a photo of what I've gotten done today4'x8' vacuum table build questions-20190109_165825-jpg



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    Default Re: 4'x8' vacuum table build questions

    I was able to get my plenum routed and Saturday I'm going to build the T-Slot track installed, vacuum motor box & hopefully plumb the zone & get the edges of the LDF sealed.

    My question is for anyone using the motors from central vacuum
    8.4" 240V p/n 122178-18), What filter are you using to filter the cooling intake air? Warren from central vacuum said to make sure the cooling air is filtered.

    Than you.
    Gary
    4'x8' vacuum table build questions-20190110_233431-jpg



  4. #16
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    Default Re: 4'x8' vacuum table build questions

    Today I didn't get as much done as I wanted but I got a bit done. I was able to get the t-slot tracking installed, the vacuum motor box built & 2 coats of triple thick polyethylene on the edges of my LDF.

    Today's question is does my vacuum motor box need painted? Instead of gluing and screwing it together I used silicone to help seal the joints, so I'm not sure if I'll be able to get paint to stick to the areas were I wiped off the squeeze out.

    Thanks4'x8' vacuum table build questions-20190112_174646-jpg4'x8' vacuum table build questions-20190112_174911-jpg4'x8' vacuum table build questions-20190112_174904-jpg



  5. #17
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    Default Re: 4'x8' vacuum table build questions

    Gary- Looking good! Curiosity question, is each motor going to be connected to a common plenum, or is each motor going to be dedicated to a section of the table?
    Cheers
    Sean



  6. #18
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    Default Re: 4'x8' vacuum table build questions

    Sean, Thanks there is a divider between each motor inside the box, and each box will have it's own power switch. The output of each motor comes out to a 90° up into a gate valve that that keeps air from coming back into the motor(s) that are not turned on. Then each of the 4 gates T into a common area that in turn, T's out into 4 more gates. (The 8 T's & stubs between them create the common area) these last 4 gates direct the vacuum into each of the 4 zones. This way I can run either 1 motor for all 4 zones or 4 motors on one zone or any other combination.

    What about needing to paint the vacuum box? I wouldn't think air would be able to leak through 3/4" plywood.

    Thanks
    Gary



  7. #19
    Community Moderator ger21's Avatar
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    Default Re: 4'x8' vacuum table build questions

    I'd brush a coat of polyurethane on it. It won't hurt. You'd be surprised how vacuum can go through wood products.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  8. #20
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    Default Re: 4'x8' vacuum table build questions

    Thanks Gerry I'll do that today



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    Default Re: 4'x8' vacuum table build questions

    I put 2 more coats on my spoil boards today & put 2 coats on my vacuum box. It's not pretty but its thick & sealed. I'm hoping to get the plumbing done tomorrow.
    4'x8' vacuum table build questions-46411-jpg

    I'm starting to plan on a few jobs once I get this finished. But I'm struggling to figure out how to do 2 sided jobs with a vacuum table. I do not want to drill registration hole in my vacuum table spoil board. I have an idea but it is a little involved & I'm hoping there is another option.
    Any help is greatly appreciated.

    Thanks all
    Gary



  10. #22
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    Default Re: 4'x8' vacuum table build questions

    Re: Double-sided machining: Use the center of the table T-slots as a reference point (0, 0) and flip your second side using your software to mirror the opposite side of the project tool path using the same reference co-ordinates.



  11. #23
    Community Moderator ger21's Avatar
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    Default Re: 4'x8' vacuum table build questions

    Bolt down oversize fences to your T track, and route the reference edges.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  12. #24
    *Registered User* Aerojunkie's Avatar
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    Default Re: 4'x8' vacuum table build questions

    What if you make a smaller spoilboard the size of the part with some reference pin holes in it? Clamp a couple boards to the table on 2 edges that make a 90 to reference the smaller spoilboard to when you set it down. Then let the vaccum hold it down.



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