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Downdraft Sanding Table

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Forum topic by Ragis10 posted 10-01-2020 01:54 PM 453 views 0 times favorited 16 replies Add to Favorites Watch
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Ragis10

2 posts in 26 days


10-01-2020 01:54 PM

Topic tags/keywords: sanding downdraft dust dustcollection

I recently built my first downdraft table and I loved the way it looked and from all of the videos I watched and diy blogs I read, I thought I was doing it correctly, until I hooked up the shop vac to it. There is very little suction and I’m not sure if I am suppose to add an intake hole or two to create better flow but I’m stuck


16 replies so far

View davezedlee's profile

davezedlee

60 posts in 1708 days


#1 posted 10-01-2020 02:55 PM

your shopvac has an effective range of about 5×5 inches at its port, which appears to be about a tenth of the area of your board

thats probably where you want to start

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Ragis10

2 posts in 26 days


#2 posted 10-01-2020 03:22 PM

Thank you for your reply davezedlee. So are you saying I need to add another port or will the box be ineffective because its too big?

View Russell Hayes's profile

Russell Hayes

25 posts in 62 days


#3 posted 10-01-2020 04:05 PM

The area of a 3/16” peg board hole is .083. The area of a 2.5” shop vac hose is 4.9”. I’m counting approximately 1200 holes in your downdraft table. So you have opened up about 20 times the surface area of your shop vac hose. Plug 95% of the holes or make the table 20 times smaller.

-- Have a hobby? You should have a business.

View Brawler's profile

Brawler

176 posts in 714 days


#4 posted 10-01-2020 04:57 PM

Maybe you could try a low pressure high volume source like a squirrel cage blower from a furnace, just a thought.

-- Daniel, Pontiac, MI

View AndyJ1s's profile

AndyJ1s

463 posts in 639 days


#5 posted 10-01-2020 07:17 PM

A shop vac has enough (negative) pressure for the tiny holes, but not enough volume flow for all of them.

I takes a substantial dust collector (and a bigger duct/hose connection) to run a downdraft table that size. But dust collectors don’t have as much pressure, so the holes need to be bigger.

-- Andy - Arlington TX

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AndyJ1s

463 posts in 639 days


#6 posted 10-01-2020 07:18 PM

removed duplicate.

-- Andy - Arlington TX

View pottz's profile

pottz

11717 posts in 1868 days


#7 posted 10-01-2020 07:29 PM

i made one a few years back that was only 1/3 that size and well it just didn’t do much as far as collecting dust so it is no longer taking up space in my shop.i found the best soloution was to connect a vac to whatever sander im using,no dust at all now.the only down draft tables ive seen that did anything were big heavy duty commercial ones not practical for the home shop.the vac connected to the sander is your best way of getting rid of dust.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

View northwoodsman's profile

northwoodsman

389 posts in 4630 days


#8 posted 10-01-2020 10:21 PM

Hook your vac directly to the sander. If the sander doesn’t have a dust collector port invest in a new sander. I realize that Festool is out of the price range for many hobbyists but if I could only one Festool tool besides the Domino it would be one of their sanders. I already have 9 various portable sanders all in excellent working condition, two are brand new in the unopened box, yet this weekend I bought two new Festool sanders. Absolutely “0” residual dust with the right dust collector.

-- NorthWoodsMan

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northwoodsman

389 posts in 4630 days


#9 posted 10-01-2020 10:22 PM

Delete.

-- NorthWoodsMan

View AlaskaGuy's profile

AlaskaGuy

6113 posts in 3193 days


#10 posted 10-01-2020 10:34 PM

Way back in about 1999 I was considering building one of these downdrafts tables. Ended up with a Festool sander and vac. 21 years later I think I made a good choice.

I think a sand and vac is a better option. Doesn’t have to be Festool.

-- Alaskan's for Global warming!

View pottz's profile

pottz

11717 posts in 1868 days


#11 posted 10-01-2020 10:35 PM



Hook your vac directly to the sander. If the sander doesn t have a dust collector port invest in a new sander. I realize that Festool is out of the price range for many hobbyists but if I could only one Festool tool besides the Domino it would be one of their sanders. I already have 9 various portable sanders all in excellent working condition, two are brand new in the unopened box, yet this weekend I bought two new Festool sanders. Absolutely “0” residual dust with the right dust collector.

- northwoodsman


+1 also the mirka deros sanders are excellent,zero dust but also pricey but a lot better than COPD.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

View mel52's profile

mel52

1706 posts in 1148 days


#12 posted 10-02-2020 02:37 AM

You might try to just cover up part of the holes that aren’t directly around your project. Might make the rest of them suck a little better. Mel

-- MEL, Kansas

View WoodenDreams's profile

WoodenDreams

1161 posts in 795 days


#13 posted 10-02-2020 05:39 AM

View Craftsman on the lake's profile

Craftsman on the lake

3527 posts in 4321 days


#14 posted 10-02-2020 02:20 PM

I’ve tried using a good, larger shop vac for various things. The inlet has to be in close proximity to the dust. Like the shroud on a belt sander for instance. It will not pull dust in from any distance. i.e. Put some sawdust on the floor. place the nozzle of the sander near the dust. It has to be no more than a few inches away for it to suck up. 6” to the side and it won’t. So, sand right over the dust port and you might get some. Anyplace else on the table and what falls through the holes will just be by chance. There’s no draw in those areas.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

View Redoak49's profile

Redoak49

4921 posts in 2872 days


#15 posted 10-02-2020 04:33 PM

Using a bell mouth hood will help improve dust collection. It will pull dust from much farther than a plain pickup or just end of a hose.

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