Lid question for 20 gallon metal trash can

[penaddict]

Hi Phil,
I have a Delta 50-760 dust collector and currently use a 30 gallon trash can with your baffle.  I want to place the trash can under the dust collector but the 30 gallon is just a bit too tall to fit.  I got a 20 gallon metal trash can and want to make a lid for it using the 4" dust port from Woodcraft.  Do you have any suggestion on where the holes can be for the lid?  The diameter of the 20" trash can is about 18.5".
TIA
Mike

[dbhost]

Not sure about 4" duct, but with my 2.5" I simply cut my disk, routed my rabbet, and then set my hose connection port on top of the lid, with the corners as close to the edge as I could get it. I traced the outline of the connector, and used a straight edge to draw a line to opposing corners making an X in the middle which marks the center of my hole. I then set the connector in place, then set the other one on the center of the lid, and saw there was plenty of room... I cut out the holes with the hole saw at the center point of the X, as well as the center point of the lid.

I'm not sure this is the best picture to illustrate the point, but you should be able to see that I have plenty of space between my ports, that if I wanted to run 4 inch, it shouldn't be a problem...

[penaddict]

Thanks DBHOST,
I already have a 30 gallons that I made for both Delta 50-760 and the shopvac.  For using with the shop vac I just use a 4" to 2.25" adapter.  What I want is to be able to fit the trash can underneath the dust collector using the 4" hoses.  Because the diameter of the 20 gallon trash can is only about 18", I have about 9" from the edge to the center to cut out 2 4" holes.  And this is what my question is all about.  Would it work if the separation between the 2 4" holes about an inch apart?

Mike

[billw]

Have a look at this thread:

http://www.jpthien.com/smf/index.php?topic=50.0

  -- Bill

[dbhost]

Gotcha.

Sorry I misunderstood what you were asking... Okay now I am not real sure if the closeness of the ports is going to be a problem, or even if they are going to be that close... I think 3" is more like it... 18/2 = 9" and your elbow is 4" so 9 -4 = 5", and you will have half the diameter of the output tube, or 2" in the center there, so 5 - 2 = 3" right?

As I understand the concept, right or wrong, The incoming air charge is directed at the outside of the can, where new incoming air keeps it spinning, and dropping its load, the load reduced, ore eliminated air is then in turn sucked up through the output tube...

Phil, you care to chime in on this one? I am not sure about it...

OP, if you want someone to try it for you PM me for my addy to send the DC to and I will experiment with it for you...

[phil (admin)]

Sorry for the delayed response.

My gutt says it will be fine.  Just keep the inlet close to the side of the can.

[penaddict]

Thanks Phil and dbhost
I measured the trash can again to confirm that I have 18" outer diameter and 17.25" inside diameter and this is what my lid will be for the 20 gallons.  By placing the center 4" hole at 9", I will have 2" between the two 4" holes (9" center + 2" radius + 2" separation + 4" hole + 1/4" = 17.25).
Mike

[phil (admin)]

I think that will work fine.

What do you plan on using for fittings, and how will you attach your hoses?

[dbhost]

Just my humble opinion here, but 3/4" seems like an awful lot of material to remove for a rabbet. Mine is 1/2x1/2" and offers plenty of bite and sealing surface. Not sure going 3/4" is going to get you anything other than more sawdust...

[penaddict]

I think you're right dbhost.  1/2 it is.  As for the fittings, I found some 3" fittings at Home Depot (I think it's 3" and the color is black).  The outside diameter is 4" and the inside is 3.5".  I got the 45 degree fitting that will be connect with the 90 degree fitting through a short 3.5 straight tube that you can buy in a 24" length.  This is for the intake.  And for the out port that connect to the dust collector, I use the same 3.5" tube connect to a coupler which connect to a short 4" flex hose and this short hose is connected to a 4 to 5 inch adapter that connects to the dust collector.  You can get this 4 to 5 inch adapter at woodzone.com
Mike

[bennybmn]

I would think you would want the incoming stuff as close to the edge as possible, no? Regardless of the dimension to the center.

[dbhost]

I would think so, that's what Phil says, which is why he tells you to get the elbow as close as possible to the wall of the can / drum.

[bennybmn]

Exactly. I'm still liking the idea someone came up with where you have the intake on the side... Eliminates a couple elbows and reduces obstructions in the cyclone.