I have a Penn State DC2V2 dust collector and have used it for many
years as a roll around unit hooking it up as needed. Then I got a
pre-collector cyclone 4" top for a metal trash can which collected all
my trash very well leaving only a little remaining in the bottom filter
bag. I recently piped my small shop with 5" metal pipe and fittings and
made a new top for the trash can with 5" passthrough fittings and
elbow. Now however the trash is sucked through the can into the bottom
filter bag leaving only a little residue in the can. View pictures of
my set up here http://www.nami-savannah.org/woodworking.htm
Any suggestions as to why this is not working with 5" pipe/hose but ran
fine with 4"?
As I look at your new "top" it appears that they are piped in straight
down. The trash can collector is a form of a cyclone and works because
the air is swirled around and the dust drops out. Then lower velocity
air exits from the center.
I'd suggest that you move the 5" exit to the center of the new top and
either angle the 5" entrance (now moved to towards the edge) or add an
elbow so that the air enters tangentially to the trash can's side.
Let us know how that works out.
FWIW I have the same DC, 6" piping and use a trash can collector only
on my planer, so I use a 4" inlet (angled and tangential) and a 4"
outlet (centered). Works well.
Bob wrote:
> I have a Penn State DC2V2 dust collector and have used it for many
> years as a roll around unit hooking it up as needed. Then I got a
> pre-collector cyclone 4" top for a metal trash can which collected all
> my trash very well leaving only a little remaining in the bottom filter
> bag. I recently piped my small shop with 5" metal pipe and fittings and
> made a new top for the trash can with 5" passthrough fittings and
> elbow. Now however the trash is sucked through the can into the bottom
> filter bag leaving only a little residue in the can. View pictures of
> my set up here http://www.nami-savannah.org/woodworking.htm
> Any suggestions as to why this is not working with 5" pipe/hose but ran
> fine with 4"?
Bob wrote:
> I have a Penn State DC2V2 dust collector and have used it for many
> years as a roll around unit hooking it up as needed. Then I got a
> pre-collector cyclone 4" top for a metal trash can which collected all
> my trash very well leaving only a little remaining in the bottom filter
> bag. I recently piped my small shop with 5" metal pipe and fittings and
> made a new top for the trash can with 5" passthrough fittings and
> elbow. Now however the trash is sucked through the can into the bottom
> filter bag leaving only a little residue in the can. View pictures of
> my set up here http://www.nami-savannah.org/woodworking.htm
> Any suggestions as to why this is not working with 5" pipe/hose but ran
> fine with 4"?
Try aiming the elbow towards the outside wall of the trashcan. You can
try adjusting that angle. That may result in reducing the airflow back
down to the previous 4". However, I expect would be closer to 4.8"
should be enough.
Thanks for all the help. I cobbled up a new lid with a shallower angle
and entended the exit pipe into the trashcan which produced a little
improvement. However, it was so negligible that I would still have to
empty the bottom DC filter bag plus the little trash remaining in the
can. Bill Pentz
explains the problem well.
"From Bill Pentz' website:
Unfortunately, trashcans do not scale up well.
Using a 1 HP blower with 5" or larger
ducting increases the airflow and keeps the dust from separating. Too
much airflow simply scours the trash can empty of all but large
blocks. "
Given this info I think I will just use the bottom bag for now until I
can make or purchase
a real cyclonic dust collector. Anyway, it's sure great not having to
roll and hook-up every
time I want to use a different machine. Now if I could only have
automatic gates.... how
quickly I become spoiled.
Thanks again for all the suggestions and interest.
Bob wrote:
> I recently piped my small shop with 5" metal pipe and fittings and
> made a new top for the trash can with 5" passthrough fittings and
> elbow. Now however the trash is sucked through the can into the bottom
> filter bag leaving only a little residue in the can.
> Any suggestions as to why this is not working with 5" pipe/hose but ran
> fine with 4"?
I'm guessing that it's one of two things:
1) The 5" lines will pass much more air, and it might be enough of a
difference to scour the trash can clean.
2) Your homemade cyclone lid might not direct the air properly to drop
out the debris. I suggest having the input come in at a shallow angle
along the top of the lid, as close as possible to the edge. You may
also want to have the output stick down a bit into the container.
Chris
On 29 Sep 2006 14:52:06 -0700, "Bob" <[email protected]> wrote:
>I have a Penn State DC2V2 dust collector and have used it for many
>years as a roll around unit hooking it up as needed. Then I got a
>pre-collector cyclone 4" top for a metal trash can which collected all
>my trash very well leaving only a little remaining in the bottom filter
>bag. I recently piped my small shop with 5" metal pipe and fittings and
>made a new top for the trash can with 5" passthrough fittings and
>elbow. Now however the trash is sucked through the can into the bottom
>filter bag leaving only a little residue in the can. View pictures of
>my set up here http://www.nami-savannah.org/woodworking.htm
>Any suggestions as to why this is not working with 5" pipe/hose but ran
>fine with 4"?
On mine, the middle (to DC) is a straight run and the outer one (from saw) is a
90 degree elbow which seems to work well...
maybe you're not getting the "cyclone" action?
Mac
https://home.comcast.net/~mac.davis
https://home.comcast.net/~mac.davis/wood_stuff.htm
It sounds like your original top was bought and that you made your own top
for the 5" pipe. Assuming that is correct, you must not have the air flown
properly to create the cyclone effect.
"Bob" <[email protected]> wrote in message
news:[email protected]...
>I have a Penn State DC2V2 dust collector and have used it for many
> years as a roll around unit hooking it up as needed. Then I got a
> pre-collector cyclone 4" top for a metal trash can which collected all
> my trash very well leaving only a little remaining in the bottom filter
> bag. I recently piped my small shop with 5" metal pipe and fittings and
> made a new top for the trash can with 5" passthrough fittings and
> elbow. Now however the trash is sucked through the can into the bottom
> filter bag leaving only a little residue in the can. View pictures of
> my set up here http://www.nami-savannah.org/woodworking.htm
> Any suggestions as to why this is not working with 5" pipe/hose but ran
> fine with 4"?
>
On 29 Sep 2006 14:52:06 -0700, "Bob" <[email protected]> wrote:
>I have a Penn State DC2V2 dust collector and have used it for many
>years as a roll around unit hooking it up as needed. Then I got a
>pre-collector cyclone 4" top for a metal trash can which collected all
>my trash very well leaving only a little remaining in the bottom filter
>bag. I recently piped my small shop with 5" metal pipe and fittings and
>made a new top for the trash can with 5" passthrough fittings and
>elbow. Now however the trash is sucked through the can into the bottom
>filter bag leaving only a little residue in the can. View pictures of
>my set up here http://www.nami-savannah.org/woodworking.htm
>Any suggestions as to why this is not working with 5" pipe/hose but ran
>fine with 4"?
From Bill Pentz' website:
Unfortunately, trashcan separators do not scale up well. Typical
hobbyist trashcan separators work well until you have a system that
moves more than about 450 CFM. That means any dust collector over
about 1.0 HP will have problems with a trashcan separator unless the
airflow to that collector is strangled by using far too small 4"
ducting that limits the airflow. Using a 1 HP blower with 5 or larger
ducting increases the airflow and keeps the dust from separating. Too
much airflow simply scours the trash can empty of all but large
blocks. My 1.5 hp system with a trashcan separator worked fine until I
upgraded to 6" ducting after realizing my 4" ducting was strangling
dust collection airflow. After upgrading to 6" ducting the increased
airflow left my trashcan scoured clean. We could build a much bigger
trashcan separator that would work, but for the 800 CFM we need for
good fine dust collection, we end up needing a 52 wide trashcan that
sits ceiling high.
http://billpentz.com/woodworking/cyclone/Index.cfm
Read the whole thing.
-Leuf
Bob,
FWIW, take a look at the following links:
http://www.woodcraft.com/articles.aspx?articleid=408
http://community-1.webtv.net/WoodworkerJoe/BuildADustCollector/index.html
These might give you some help in redesigning your separator lid. Let us
know how it works out.
Hope this helps.
Peter.
"Bob" <[email protected]> wrote in message
news:[email protected]...
>I have a Penn State DC2V2 dust collector and have used it for many
> years as a roll around unit hooking it up as needed. Then I got a
> pre-collector cyclone 4" top for a metal trash can which collected all
> my trash very well leaving only a little remaining in the bottom filter
> bag. I recently piped my small shop with 5" metal pipe and fittings and
> made a new top for the trash can with 5" passthrough fittings and
> elbow. Now however the trash is sucked through the can into the bottom
> filter bag leaving only a little residue in the can. View pictures of
> my set up here http://www.nami-savannah.org/woodworking.htm
> Any suggestions as to why this is not working with 5" pipe/hose but ran
> fine with 4"?
>
>