DownDraft Box - Page 2 - Router Forums
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post #11 of 30 (permalink) Old 09-04-2018, 05:23 PM
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Yep, ole Herb gets it!!

rather than seal off some holes....

https://www.rockler.com/non-slip-router-mat
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post #12 of 30 (permalink) Old 09-05-2018, 12:43 PM Thread Starter
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After reading this: Dust Collection Research - Downdraft Table

I am not sure it will even work.


I used the Rockler pdf.

25077-Down-Draft-Ezplan2.pdf



It is approximately 27X17X6".

No Hardware Clothe. What small parts are supposed to be able to fall into the box? this is for ROS sanding things larger than the holes. And since it is not made for cleaning the shop air en mass just for creating a negative pressure around a small area where I am sanding, and according to the article above will not work anyway, I may be able to cover part of the top,depending on the size of my piece to adjust the air flow. Thanks for all the comments,and suggestions, I should have done more research before I built this. It was a good exercise in drilling holes,though.

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post #13 of 30 (permalink) Old 09-05-2018, 05:16 PM
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Nice build Herb. I built one similar to the one David shows a number of years ago. Since it's hooked up to my shop vac, I don't get a lot of downdraft when I sand smaller items. To remedy that, I just put a piece of plastic or some plywood, whatever is handy, to cover most of the exposed holes that are not around the piece that i'm sanding. That increases the airflow through the holes that are left uncovered. Works well enough to get most of the sawdust.
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post #14 of 30 (permalink) Old 09-05-2018, 07:43 PM Thread Starter
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Quote:
Originally Posted by Barry747 View Post
Nice build Herb. I built one similar to the one David shows a number of years ago. Since it's hooked up to my shop vac, I don't get a lot of downdraft when I sand smaller items. To remedy that, I just put a piece of plastic or some plywood, whatever is handy, to cover most of the exposed holes that are not around the piece that i'm sanding. That increases the airflow through the holes that are left uncovered. Works well enough to get most of the sawdust.
I like that idea, I was thinking of a rubber mat like @TwoSkies57 ,Bill suggested too, to keep the material from sliding around also. I could make 2 top panels W/O holes too and just keep the middle one with holes,the others for spares.

I am hooking it up to my 3hp DC with 4" flex which has a lower velocity of air flow, but higher volume. I will figure out some way to get this thing to work.

Herb

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post #15 of 30 (permalink) Old 09-06-2018, 02:36 PM
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I like that idea, I was thinking of a rubber mat like @TwoSkies57 ,Bill suggested too, to keep the material from sliding around also. I could make 2 top panels W/O holes too and just keep the middle one with holes,the others for spares.

I am hooking it up to my 3hp DC with 4" flex which has a lower velocity of air flow, but higher volume. I will figure out some way to get this thing to work.

Herb
Herb, I have the same mat. I do most of my routing on the router table. When I make something like my oval cheese board with a large, curved routed goove to hold crackers and such I use my plunge router. That mat works great holding the piece so it doesn't slip around. I managed to tear my mat so I ordered a new one. Based on this thread I think I'll cut the old mat to use with the downdraft box. Mine is smaller than yours so I'm thinking of two sizes. One to cover half of the top and a second one to cover the whole top with a section cut out for sanding smaller pieces. I'll adjust based on the results.

With the size of your DC you shouldn't have much trouble with the sawdust. You may have a little collect on the top between the holes but a quick swipe with a workbench brush will clean it off. Since I'm using pegboard I have more space between much smaller holes so I do get some build up but it doesn't effect the sanding operaton.
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post #16 of 30 (permalink) Old 09-09-2018, 04:35 PM Thread Starter
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I well today I completed the downdraft box and all my fear were for naught, I works great. I do have a rubber pad for it coming, but might not even need it. I am happy camper ,it works way better than I had imagined. I did put side boards on it and they makes a big difference.

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post #17 of 30 (permalink) Old 09-11-2018, 07:34 PM Thread Starter
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Quote:
Originally Posted by Barry747 View Post
Herb, I have the same mat. I do most of my routing on the router table. When I make something like my oval cheese board with a large, curved routed goove to hold crackers and such I use my plunge router. That mat works great holding the piece so it doesn't slip around. I managed to tear my mat so I ordered a new one. Based on this thread I think I'll cut the old mat to use with the downdraft box. Mine is smaller than yours so I'm thinking of two sizes. One to cover half of the top and a second one to cover the whole top with a section cut out for sanding smaller pieces. I'll adjust based on the results.

With the size of your DC you shouldn't have much trouble with the sawdust. You may have a little collect on the top between the holes but a quick swipe with a workbench brush will clean it off. Since I'm using pegboard I have more space between much smaller holes so I do get some build up but it doesn't effect the sanding operaton.
Barry, you might try enlarging some or all of your holes. The small holes actually cut down on the sir flow. Also they recommend beveling both sides of the holes to increase air flow. You can do that by just using a countersink.
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post #18 of 30 (permalink) Old 09-11-2018, 08:27 PM Thread Starter
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Tom, a Dust Collector is low velocity and high volume, a shop vac is just the opposite low volume high velocity A dust collector does not increase velocity when it is choked down, it has the same velocity and less volume. So if you say choke a 4" DC down to 2 1/2" you get the same as a 2 1/2" @ the same velocity as before but nearly 1/2 the volume as before.
You can tell by the sound of the DC. Leave the 4" wide open , it is loud making lots of noise, cover the end completely it is half as loud, because the motor and fan are not working hard moving air. Open your fingers and it is half again as loud,the motor and fan are working, but not full rate yet.
You can do the same with an amp meter on the DC line. Start up the DC with all the blast gates closed,(mine reads ) 9.6 a. everything closed, and 11.8 a. everything wide 0pen, which indicates it is working harder moving more air open and decreases when closed.
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post #19 of 30 (permalink) Old 09-11-2018, 09:15 PM
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Thanks Herb. Seems counterintuitive, but it is what it is. So my suggestion is not good so I removed it.

The more I do, the less I accomplish.
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post #20 of 30 (permalink) Old 09-12-2018, 02:20 AM Thread Starter
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I think that is because everyone thinks of a vacuum cleaner that is running at very high speeds compared to a 3750 rpm Dust collector, they are in the router motor range 10,000 rpm or more. And the number of fan blades on a dust collector are at least half what a vacuum cleaner fan has. So you have two different principles of moving a lot of air slowly and a small amount fast.

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