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bobn4burton
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Topic: My DIY skimmer...PIC INTENSIVE... Posted: March 29 2005 at 1:20am |
Hi all,
I decided to build me a skimmer. This is the first skimmer I've
ever built and even the first "real" skimmer I've owned. I took
my ideas from several sources (Euroreef, deltec, other DIY'ers, my own
brainstorming). I'll list some quick specs of the skimmer and
then show a bunch of pictures of the whole build process (I'm showing a
ton of pictures because I always like to see lots of peoples
pictures...so if you don't want to see all the pictures then just
scroll to the end )
Skimmer Specs:
Reaction body: 6" extruded acrylic tubing 18" tall
Pump: Ocean Runner 2700 (2700=2500+needlewheel impeller)
Air intake: DIY venturi on Recirculating pump
Riser tube: 2.75" riser tube about 3.5" tall
Skimmer total height: 25" tall
OK, now on to the pictures...
This first picture is one of all my supplies before getting started:
I decided that I wanted a slanted skimmer neck to transition from
skimmer body to riser tube. This should help with bubble travel
from body to riser. To do this I simply heat up a disc of acrylic
in the kitchen oven and formed my reducer.
Here are two pieces of plywood I used to sandwich the acrylic while heating:
You can see the 5.75" holes I cut in the plywood for the forms.
This next picture shows the acrylic "sandwich" cooking in the oven:
I then used the tubing reserved for my riser tube to push the acrylic into my shape as seen below:
Here is a picture of the finished reducer after thermo-forming:
I then cut a hole in the thermo-formed reducer and glued my riser tube on:
I then started working on the body. Here shows the holes in the body for pipe inlets/outlets:
And this pic shows the flange used to fasten the collection cup assembly to the body being glued to the body:
The next part that I worked on was the ventui. It was quite
simple really, just an airtube pushed tightly into a Tee with a hole
cut in the airtube for air to be pulled into the water stream and into
the pump.
Here are a couple pics of the venturi:
I then worked on the collection cup and keyholes to fasten the
collection cup assembly to the body. Here are a few pics of the
process:
Now all the parts were about done. I actually flipped the pump
backwards from the way you'd normally see the deltec or ER
recirculating skimmers. This gave me better airflow into the body
because the venturi inlet was a good 4-5 inches higher and so it had
less backpressure on it. Here is a pic of the mounted pump:
And finally here is a pic of the finished product:
And a couple shots when I was testing it in a tub of tankwater:
These two foaming pics were taken immediately into the testing.
After running it for two days straight the skimmer started to
"break-in" a little and it was actually foaming about 3 times as good
but I didn't get pics of it then
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bobn4burton
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Posted: March 29 2005 at 1:25am |
Oh...and as an FYI...
If anyone was interested in seeing how the pump could be mounted
"normally" here is a pic. I can actually change it either way
with how its setup in about 15 seconds.
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ssilcox
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Posted: March 29 2005 at 2:20am |
Pretty slick!
I especially like the "thermo-formed reducer". Great work.
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joliverson
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Posted: March 29 2005 at 8:03am |
I'm interested in knowing the build cost. I'd like to do something like this but think the cost wouldn't be much less than a ASM or deltec skimmer.
Jody
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jfinch
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Posted: March 29 2005 at 8:55am |
Awesome! And I too like the thermoformed reducer.
Did you cut out the keyhole slots by hand? With a dremel or router?
Are you getting a good seal using a full faced rubber gasket and 1/4" acrylic flanges? I've had problems with that combination (the 1/4" acrylic flexes too much... 3/8 or 1/2" would work much better). If you have problems look at using a large n-buna o-ring instead of the gasket. I really like o-rings.
I want to build a recirculating skimmer too...
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jfinch
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Posted: March 29 2005 at 8:56am |
Oh almost forgot. How hot did you heat up the acrylic to form the reducer?
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bobn4burton
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Posted: March 29 2005 at 9:30am |
joliverson wrote:
I'm interested in knowing the build cost. I'd like to do something like this but think the cost wouldn't be much less than a ASM or deltec skimmer.
Jody
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Cost really wasn't bad at all. MUCH cheaper than buying one. I spent about 35 dollars on all the acrylic and supplies relating to acrylic: acrylic tubing and sheet, weld-on, applicator, etc. I then spent 15 dollars on the Uniseals. 8 dollars on the telescoping 1 1/2" PVC fitting. 50 dollars on the Ocean Runner 2700 NW pump. An probably about another 10-15 dollars in all the pvc fittings and misc stuff.
35 + 15 + 8 + 50 + 15 = $123
The skimmer I made compares to about the 800 dollar deltec. Its hard to compare against a Euro-reef because they don't list a price for their recirculating skimmers that I've seen anyway. Also hard to compare to ASM because they don't have a recirculating model that I'm away of. But I'm sure you couldn't get a comparable skimmer for under 300.
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bobn4burton
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Posted: March 29 2005 at 9:37am |
jfinch wrote:
Awesome! And I too like the thermoformed reducer.
Did you cut out the keyhole slots by hand? With a dremel or router?
Are you getting a good seal using a full faced rubber gasket and 1/4" acrylic flanges? I've had problems with that combination (the 1/4" acrylic flexes too much... 3/8 or 1/2" would work much better). If you have problems look at using a large n-buna o-ring instead of the gasket. I really like o-rings.
I want to build a recirculating skimmer too...
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Yes, I cut the keyholes by hand with a dremel. I just cut the larger hole and then drilled a smaller hole next to each larger hole. I then took my dremel and made the smaller hole into a slot.
I actually don't get the best seal with the full faced gasket. The gasket material is too hard. It leaks enough to drip a couple times every few minutes. Do you konw of a better o-ring I could use...and possibly where to get one? I'm not sure what n-buna means.
As for heating the acrylic, I just put my 9" acrylic flat disc sandwiched between the two plywood forms as you can see in the pictures. I then preheated my oven to 300 deg F. Once my oven was preheated, I put the acylic sandwich in the oven for about 10-14 minutes and it was just plyable enough that I could use my riser tube to push down and form the reducer. It worked very slick and easy. MUCH easier than I thought it would and I'm very happy with the results.
I posted about this on RC, and got warned about possible flammable fumes escaping from heating the acrylic...so I guess there's a chance that heating the acrylic in your kitchen oven isn't 100% safe. I obviously felt the risk was small enough to not worry about...but if anyone wants to try the kitchen oven method...just be warned.
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bambbrose
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Posted: March 29 2005 at 10:13am |
very nice work. If I was to make a smaller version would it work
the same? I don't have a ton of space under my stand and I'm just
curious how well a smaller version would work
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bobn4burton
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Posted: March 29 2005 at 10:33am |
I don't see any reason why it wouldn't work making it smaller. You could easily cut the skimmer body down from 18" high to 12" high. The footprint could get a little smaller...but not too much because the pump is just so big and all of the tubing coming in and out takes up a lot of room. You might be able to shrink it up with some creative placement of parts.
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fj40fax
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Posted: March 29 2005 at 10:43am |
How much of it can be underwater? I think I have about 20" of space, but about 15" of it is underwater in the sump.
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bobn4burton
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Posted: March 29 2005 at 11:06am |
You can submerse it up to the flange that connects the collectin cup assembly to the body. only 20" of space is pretty tight. I have about 26.5" inches of space and the skimmer is 25" tall. So I don't have much room to spare.
But you could build a skimmer that was 6" shorter (cut the body down 6") and you could almost fit it in there.
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jfinch
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Posted: March 29 2005 at 11:12am |
Do you konw of a better o-ring I could use...and possibly where to get one?
Search for 0-ring at www.dexonline.com for a local source. I buy mine from HydraPak Seals on about 20th south and 37th west. A 6.25 - 6.5 inch o-ring is about $0.50, but they have a minimum order of $5. The thin sealing surface of the oring works great, even on 1/4" acrylic.
I'm not sure what n-buna means.
sorry... engineering habit. n-buna is the material. Just regular old black o-rings.
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Posted: June 02 2006 at 8:28am |
Hi people.
Where can i find the photos form this topic?
It realy inspire me to make my DIY skimmer. I put this topic in my favorites a weeks ago, i now the pictures disapear...
Could any one help me please.
Thanks in advance!
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bobn4burton
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Posted: June 02 2006 at 10:42am |
The site I was using to host my files seems to be down. I'm trying to find another cheap/free web hosting site....so I'll have them back up shortly.
Sorry!
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bobn4burton
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Posted: June 08 2006 at 1:41am |
Pics should be back for now...
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ReefBones
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Posted: June 08 2006 at 1:52am |
No pics :( ... just a bunch of smilies ...
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140 gallon Reef 65 gallon Reef 55 gallon Aggressive www.thesalttank.com 801-865-6074 "encourage other divers and sea enthusiasts to take nothing but pictures and leave nothing but bubbles"
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Posted: June 08 2006 at 3:04am |
Yep including in your avatar.
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bobn4burton
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Posted: June 08 2006 at 3:07am |
Hmmm...it was working at first. Apparently the free hosting place I just signed up for doesn't like me linking to pics from a forum??? Well...I'll get this sorted out soon.
Nobody has a reccommendation for a good free web host do they?
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Posted: June 08 2006 at 3:09am |
The best i know is http://www.imageshack.us/
No need to register, just upload images!
Edited by Hugo RSF - June 08 2006 at 3:09am
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