Tried posting but did not see..apologiies if shows up twice

1200 CFM HF (OK maybe 850) DC, 10' straight run using 4" flexible hose
(no way to use PVC) off one "y" arm with the other capped..adaptor at
RAS from 4" to 2.5"..very poor suction. Having read favorable reviews
of the unit, is:

- problem using 4" hose, starving the unit of air remove 4", use 6"
run dedicated for RAS, loose use of it for anything else
- run 6'" to RAS, then use branch and blast gate, come off with 4"
hose I can plug into tools as needed, caping the branch to the RAS
when in use

Even if one of above works, does not solve problem of low suction to
seperator, so how do I fix that?

Didn't think sucking up dust could be so problematic..

C

cc wrote:

| ..adaptor at RAS from 4" to 2.5"..very poor suction.

Yup. Cause and effect. Remove the constriction and suck more dust.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/

"cc" wrote in message
ups.com...
Tried posting but did not see..apologiies if shows up twice

1200 CFM HF (OK maybe 850) DC, 10' straight run using 4" flexible hose
(no way to use PVC) off one "y" arm with the other capped..adaptor at
RAS from 4" to 2.5"..very poor suction. Having read favorable reviews
of the unit, is:

- problem using 4" hose, starving the unit of air remove 4", use 6"
run dedicated for RAS, loose use of it for anything else
- run 6'" to RAS, then use branch and blast gate, come off with 4"
hose I can plug into tools as needed, caping the branch to the RAS
when in use

Even if one of above works, does not solve problem of low suction to
seperator, so how do I fix that?

Didn't think sucking up dust could be so problematic..

C


When the air flow is reduced to a low level the suction is greatly reduced.
Try taking the cap off the wye and giving it more air. Try adjusting the
amount of air to give maximum suction.

"cc" wrote in message
ups.com...
Tried posting but did not see..apologiies if shows up twice

1200 CFM HF (OK maybe 850) DC, 10' straight run using 4" flexible hose
(no way to use PVC) off one "y" arm with the other capped..adaptor at
RAS from 4" to 2.5"..very poor suction. Having read favorable reviews
of the unit, is:

- problem using 4" hose, starving the unit of air remove 4", use 6"
run dedicated for RAS, loose use of it for anything else
- run 6'" to RAS, then use branch and blast gate, come off with 4"
hose I can plug into tools as needed, caping the branch to the RAS
when in use

Even if one of above works, does not solve problem of low suction to
seperator, so how do I fix that?

Didn't think sucking up dust could be so problematic..

C


You have a couple things causing you problems, first the 2-1/2" adaptor at
the RAS. No dust collector will "suck" well restricted down that far. Run 5"
or 6" mains, and SHORT runs of 4" to any tool. do not reduce any farther.
Straighter and less elbows is better. You probably can leave open a extra 4"
opening on the end of the run and not notice a drop in performance, and it
may help. When I use my HF collector I leave the extra 4" port open as it
does not seem to make any difference.
Remember a dust collector is high CFM, low suction, compared to a shop vac
that is low CFM, high suction. The air flow moves the dust and chips more
than suction.
Greg

On Mon, 27 Aug 2007 19:25:42 -0700, cc wrote:

Tried posting but did not see..apologiies if shows up twice

1200 CFM HF (OK maybe 850) DC, 10' straight run using 4" flexible hose
(no way to use PVC) off one "y" arm with the other capped..adaptor at
RAS from 4" to 2.5"..very poor suction. Having read favorable reviews
of the unit, is:

- problem using 4" hose, starving the unit of air remove 4", use 6"
run dedicated for RAS, loose use of it for anything else
- run 6'" to RAS, then use branch and blast gate, come off with 4"
hose I can plug into tools as needed, caping the branch to the RAS
when in use

Even if one of above works, does not solve problem of low suction to
seperator, so how do I fix that?

Didn't think sucking up dust could be so problematic..

C
Not sure if I have the same unit... 2 bag model that claims 1.5 hp?

I use 4" hose to the BS and lathe with no problem.. I also use a short 4" to
2.5" reducer at the lathe as a nozzle...

When I was using a plastic garbage can for a separator, it collapsed when I
tried to go down to 2.5" hose, so I think the DC itself "sucks pretty good"..



mac

Please remove splinters before emailing

cc wrote:

Tried posting but did not see..apologiies if shows up twice

1200 CFM HF (OK maybe 850) DC, 10' straight run using 4" flexible hose
(no way to use PVC) off one "y" arm with the other capped..adaptor at
RAS from 4" to 2.5"..very poor suction. Having read favorable reviews
of the unit, is:

- problem using 4" hose, starving the unit of air remove 4", use 6"
run dedicated for RAS, loose use of it for anything else
- run 6'" to RAS, then use branch and blast gate, come off with 4"
hose I can plug into tools as needed, caping the branch to the RAS
when in use

Even if one of above works, does not solve problem of low suction to
seperator, so how do I fix that?

Didn't think sucking up dust could be so problematic..

C

All good advice, but you are still limited to about 600-800 CFM with that
unit (I know I have/had one). What I did was build a simple platform to go
on top of the collector ring (the thing the grey 5" hose goes into) and
order two more collector rings from HF and two "shaker felt" bags from
Highland Hardware (the stock bags only filter out larger chunks).

Cut the input fittings on one of the new collector rings and slide it inside
the other collector ring's input pipe and caulk (in fact caulk all holes
not used in both rings). What this does is balances the pressure in both
collector bags. Mount the assembled rings on the platform you made and
caulk any gaps. Then mount the platform on the DC's collector ring and
caulk. Put your new "shaker felt" bags on the two top collector rings and
line the bottom "collector bag" with a large black plastic bag. You will
have about 1000-1150CFM

I said, "had" above because I took the impeller and remoted it from a
cyclone with the discharge blowing outside into a little "outhouse" . That
works even better.

Deb