West Penn Hardwoods (Ad 2)

Special Events in the next 30 days

Page 1 of 2 1 2 LastLast
Results 1 to 15 of 20

Thread: Downdraft table

  1. #1
    Senior User
    DQ
    tdukes's Avatar
    Nickname
    Eddie
    Join Date
    Nov 2017
    Location
    Lexington, SC
    Posts
    508
    Visit Freq
    5.96 visits/week
    Threads
    92
    Classifieds
    0

    Downdraft table

    Hello,

    Been wanting to make one for a while. Would kinda like to use it for sanding as well as over spray from finishing. Would have to add some filtration, maybe some pleated filters to catch any over spray and some duct work to route the fumes to the outside rather than going through my DC bags.

    I saw the panels Rockler has but not sold on them. Not sure I like the rubber grommets as they may leave black marks on the work piece. Thought about just making them out of MDF.

    If I make the panels, I thought I'd go with 3/4" holes so I could use bench dogs, inline dog hole clamps, etc., to hold the work piece in place.

    Also, I was wondering what size rigid piping is available to fit a 6" DC outlet? Would thin wall sewer pipe work? Maybe 6" flue pipe?

    TIA

  2. #2
    Senior User
    DQ
    Rushton's Avatar
    Nickname
    Rush
    Join Date
    Mar 2017
    Location
    Richmond, VA
    Posts
    107
    Visit Freq
    5.19 visits/week
    Threads
    8
    Classifieds
    0

    Re: Downdraft table

    Eddie, I plan to make a downdraft table at some point for sanding work. Mine will follow the guidelines offered in Bill Pentz's Home Build Downdraft Table design discussion on his website and will connect directly to the 6" thin wall S&D pipe I use for the ducting to my dust collector. I plan to use 1/4" hole pegboard for the top surface and use some sort of thin sheet stock to make the angled bottom panels and the top side dust shroud, and a 6" HVAC connector at the bottom of the angled bottom panels to connect to the dust collector. I look forward to seeing what you come up with as you will be several months ahead of me.

  3. The following user says Thank You to Rushton for this useful post:


  4. #3
    Senior User
    Nickname
    George
    Join Date
    Jan 2017
    Location
    Tellico Plains, TN
    Posts
    151
    Visit Freq
    6.92 visits/week
    Threads
    1
    Classifieds
    0

    Re: Downdraft table

    Use any sized holes you want just do the math and make sure the total square inches of the holes meet or slightly exceed the square inches of the duct you will be using.
    And yes you can use 6 inch flue pipe also known as KD or knock downpipe.
    Its self grounding from static electricity.
    Use foil tape or duct sealant to seal the joints and your good to go.

  5. The following 2 users say Thank You to gmakra :


  6. #4
    Senior User
    DQ
    tdukes's Avatar
    Nickname
    Eddie
    Join Date
    Nov 2017
    Location
    Lexington, SC
    Posts
    508
    Visit Freq
    5.96 visits/week
    Threads
    92
    Classifieds
    0

    Re: Downdraft table

    Quote Originally Posted by Rushton View Post
    Eddie, I plan to make a downdraft table at some point for sanding work. Mine will follow the guidelines offered in Bill Pentz's Home Build Downdraft Table design discussion on his website and will connect directly to the 6" thin wall S&D pipe I use for the ducting to my dust collector. I plan to use 1/4" hole pegboard for the top surface and use some sort of thin sheet stock to make the angled bottom panels and the top side dust shroud, and a 6" HVAC connector at the bottom of the angled bottom panels to connect to the dust collector. I look forward to seeing what you come up with as you will be several months ahead of me.
    Thanks, I saw that. Not sure about the peg board being a little thin. I think I would have to add some support in the middle but that should be an issue. Sure beats the heck out of drill about 128 3/4" holes (based on the Rockler plan).

    I can always try the peg board and see how that works. Looks like he drill the 1/4" holes out to 3/8".

  7. #5
    Board of Directors
    Treasurer
    Corporate Member
    DQ
    KenOfCary's Avatar
    Nickname
    Ken
    Join Date
    Mar 2010
    Location
    Floyd, VA
    Posts
    7,779
    Visit Freq
    6.88 visits/week
    Threads
    519
    Classifieds
    0

    Re: Downdraft table

    I made a downdraft table using the Rockler panels - 4 of them. Never had a problem with it marring the finish or leaving marks on a piece of wood and I use a lot of light colored wood like Maple.

    I use the 6" duct from the HVAC department in Lowes for my DC system. It is only 2HP and the snap-together duct stands up fine to that amount of HP. If I had a 5HP or greater system I would use something stronger. I got a bucket of this rubberized sealer to seal the snap together seam and that works well - just apply it with an acid brush and let it dry in a couple hours. Also found in the HVAC section.
    I don't believe in Astrology. I'm a Sagittarius and we're skeptical.

    "May the grain be with you" - Roy Underhill

  8. The following user says Thank You to KenOfCary for this useful post:


  9. #6
    Senior User
    DQ
    Rushton's Avatar
    Nickname
    Rush
    Join Date
    Mar 2017
    Location
    Richmond, VA
    Posts
    107
    Visit Freq
    5.19 visits/week
    Threads
    8
    Classifieds
    0

    Re: Downdraft table

    Quote Originally Posted by tdukes View Post
    I can always try the peg board and see how that works. Looks like he drill the 1/4" holes out to 3/8".
    I think the key is what George (gmakra) says: "...any sized holes you want just do the math and make sure the total square inches of the holes meet or slightly exceed the square inches of the duct you will be using."

    The modern peg board has small holes and pretty thin. I'm pulling out some 1950s vintage peg board that I plan to re-purpose for a downdraft table. It has larger holes and is also thicker. With the current thin stuff, some center support is probably a good idea.

  10. #7
    Senior User
    DQ
    tdukes's Avatar
    Nickname
    Eddie
    Join Date
    Nov 2017
    Location
    Lexington, SC
    Posts
    508
    Visit Freq
    5.96 visits/week
    Threads
    92
    Classifieds
    0

    Re: Downdraft table

    Quote Originally Posted by KenOfCary View Post
    I made a downdraft table using the Rockler panels - 4 of them. Never had a problem with it marring the finish or leaving marks on a piece of wood and I use a lot of light colored wood like Maple.

    I use the 6" duct from the HVAC department in Lowes for my DC system. It is only 2HP and the snap-together duct stands up fine to that amount of HP. If I had a 5HP or greater system I would use something stronger. I got a bucket of this rubberized sealer to seal the snap together seam and that works well - just apply it with an acid brush and let it dry in a couple hours. Also found in the HVAC section.
    I just completed the downdraft table box. Plumbed it for a 4" outlet. Not sure my DC would work well with 4 Rockler panels. They also look like the ones Grizzly and some other sell.

    What size holes are in those panels. I was guessing 3/4".

  11. #8
    Senior User
    DQ
    tdukes's Avatar
    Nickname
    Eddie
    Join Date
    Nov 2017
    Location
    Lexington, SC
    Posts
    508
    Visit Freq
    5.96 visits/week
    Threads
    92
    Classifieds
    0

    Re: Downdraft table

    Doing the math, looks like with a 4" outlet, I have 12.56 sq. inches. The Rockler table design has 445.5 sq/in. Peg board with 1/4" holes spaced 2" apart will put me just a tad over @ 251 sq/in.

  12. #9
    Board of Directors
    Treasurer
    Corporate Member
    DQ
    KenOfCary's Avatar
    Nickname
    Ken
    Join Date
    Mar 2010
    Location
    Floyd, VA
    Posts
    7,779
    Visit Freq
    6.88 visits/week
    Threads
    519
    Classifieds
    0

    Re: Downdraft table

    Quote Originally Posted by tdukes View Post
    I just completed the downdraft table box. Plumbed it for a 4" outlet. Not sure my DC would work well with 4 Rockler panels. They also look like the ones Grizzly and some other sell.

    What size holes are in those panels. I was guessing 3/4".
    I'm pretty sure that they are 3?4" holes but I'd have to verify that.
    I don't believe in Astrology. I'm a Sagittarius and we're skeptical.

    "May the grain be with you" - Roy Underhill

  13. The following user says Thank You to KenOfCary for this useful post:


  14. #10
    Corporate Member
    DQ
    Jim M.'s Avatar
    Nickname
    Woody
    Join Date
    Mar 2007
    Location
    New Church, VA
    Posts
    1,891
    Visit Freq
    6.96 visits/week
    Threads
    82
    Classifieds
    0

    Re: Downdraft table

    What about polypropylene pegboard for your downdraft tables projects? I had it in my old shop and it was tuff stuff.

    https://www.homedepot.com/p/Triton-D...-204774898-_-N
    Measure twice... cut once... SCREAM LOUDLY... get another board

  15. The following user says Thank You to Jim M. for this useful post:


  16. #11
    Corporate Member
    DQ
    Phil S's Avatar
    Nickname
    Phil Soper (68)
    Join Date
    Mar 2008
    Location
    Raleigh, NC
    Posts
    4,494
    Visit Freq
    9.58 visits/week
    Threads
    529
    Classifieds
    0

    Re: Downdraft table

    Quote Originally Posted by tdukes View Post
    Doing the math, looks like with a 4" outlet, I have 12.56 sq. inches. The Rockler table design has 445.5 sq/in. Peg board with 1/4" holes spaced 2" apart will put me just a tad over @ 251 sq/in.
    Just fiddling with the math, using 1/4" holes it looks like you would need 256 holes to match the volume of a 4" pipe

  17. The following user says Thank You to Phil S for this useful post:


  18. #12
    Senior User Fishbucket's Avatar
    Nickname
    Joe (51)
    Join Date
    Sep 2016
    Location
    Franklinville, NC
    Posts
    295
    Visit Freq
    3.27 visits/week
    Threads
    12
    Classifieds
    0

    Re: Downdraft table

    And don't forget that when you lay your project down on it, you'll be covering up a bunch of those holes.

  19. The following user says Thank You to Fishbucket for this useful post:


  20. #13
    Senior User
    DQ
    tdukes's Avatar
    Nickname
    Eddie
    Join Date
    Nov 2017
    Location
    Lexington, SC
    Posts
    508
    Visit Freq
    5.96 visits/week
    Threads
    92
    Classifieds
    0

    Re: Downdraft table

    Quote Originally Posted by Phil S View Post
    Just fiddling with the math, using 1/4" holes it looks like you would need 256 holes to match the volume of a 4" pipe

    That's about what I figured, rounding out. 445 sq/in /2 sq/in = 225. So 256 would be just a little over.

  21. #14
    Senior User
    DQ
    tdukes's Avatar
    Nickname
    Eddie
    Join Date
    Nov 2017
    Location
    Lexington, SC
    Posts
    508
    Visit Freq
    5.96 visits/week
    Threads
    92
    Classifieds
    0

    Re: Downdraft table

    Quote Originally Posted by Fishbucket View Post
    And don't forget that when you lay your project down on it, you'll be covering up a bunch of those holes.
    True, I could use bench cookies that would elevate the work piece while only covering a few holes.

  22. #15
    Senior User
    DQ
    tdukes's Avatar
    Nickname
    Eddie
    Join Date
    Nov 2017
    Location
    Lexington, SC
    Posts
    508
    Visit Freq
    5.96 visits/week
    Threads
    92
    Classifieds
    0

    Re: Downdraft table

    Quote Originally Posted by Jim M. View Post
    What about polypropylene pegboard for your downdraft tables projects? I had it in my old shop and it was tuff stuff.

    https://www.homedepot.com/p/Triton-D...-204774898-_-N
    Not quite long enough. Think I'm going to get a 2 x 4 piece of 3/16" peg board and glue it to a piece of 1/2" MDF using the peg board to drill out the MDF. That would get me to 11/16" which should be sturdy enough.

Similar Threads

  1. Downdraft table
    By smandal in forum Workshop Discussion
    Replies: 9
    Last Post: 02-09-2014, 03:36 PM
  2. Replies: 15
    Last Post: 03-12-2013, 07:54 PM
  3. Free downdraft table plan
    By PChristy in forum Found for Sale/Hot Deals
    Replies: 8
    Last Post: 05-30-2009, 05:53 PM
  4. a downdraft table on a dustcollector?
    By newtonc in forum General Woodworking
    Replies: 10
    Last Post: 02-25-2008, 05:46 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •