Dust collection

On Sun, 14 Mar 2010 08:19:35 -0500, the infamous Delbert Freeman
<[email protected]> scrawled the following:

>
>Currently, I have a HF 1200CMF blower(off their larger dust collector)
>set up to draw through a cyclone and discharge outside the building into
>a small collection building. The draw of this unit is not bad, but I
>have 7 drops in the shop and would like to upgrade the airflow. The
>tubing in the shop is 4" PVC with flex hose going to each drop and metal
>blast gates from Lee Valley.
>
>Now for the question:
>If I got another blower, built a manifold and had both blowers drawing
>out of the manifold, would my CFM be substantially increased? In
>addition, would the 4" pipe handle the increase or would I have to
>upgrade to 6"?
>
>The reason I as is that American Woodworker has a coupon from HF with the
>whole dust collector at $139.95.

I'd run straight pipe to the drops with 45-degree junctions, limiting
the flex hose and any 90-degree corners as much as possible.

And I'd set up the second sucker to half (or proper proportion of) the
machines and have safer, more positive results than I'd get from a
joining of the two systems.

With an outlet strip connected to each of two current sensors, turning
on any machine would turn on the DC for that system.

For a join, I'd probably want 5" or 6" runs.

You never said how many machines you'd be running at the same time,
but if you had two or more going concurrently, put them on different
sucker systems.

--
No matter how cynical you are, it is impossible to keep up.
--Lily Tomlin

On Sun, 14 Mar 2010 17:27:03 -0400, Phisherman <[email protected]> wrote:

>On Sun, 14 Mar 2010 08:19:35 -0500, Delbert Freeman
><[email protected]> wrote:
>
>>
>>Currently, I have a HF 1200CMF blower(off their larger dust collector)
>>set up to draw through a cyclone and discharge outside the building into
>>a small collection building. The draw of this unit is not bad, but I
>>have 7 drops in the shop and would like to upgrade the airflow. The
>>tubing in the shop is 4" PVC with flex hose going to each drop and metal
>>blast gates from Lee Valley.
>>
>>Now for the question:
>>If I got another blower, built a manifold and had both blowers drawing
>>out of the manifold, would my CFM be substantially increased? In
>>addition, would the 4" pipe handle the increase or would I have to
>>upgrade to 6"?
>>
>>The reason I as is that American Woodworker has a coupon from HF with the
>>whole dust collector at $139.95.
>>
>>Thanks
>>
>>Deb
>
>
>With two DCs, there is going to be a pull against each other. Dont
>think it is practical either. But as Ed mentioned, have two separate
>systems with shorter runs and implement anything that decreases
>turbulance.

I concur. Playing dueling DCs is not recommended. Rather than spending money
on another DC, it would be better to go to 6" pipe for the main run. 6"x4" Ys
aren't cheap, though.

>I still move a short flex hose from one machine to another with a 1.5
>HP PennState DC on wheels, just not powerful enough for a network of
>piping but does an effective job on one machine.

I have their 2HP collector. I'm debating whether to put pipe around the new
shop or just do what you're doing.

>My DC "upgrade" was the addition of a LongRanger remote 220v relay.

Love mine. I have one remote hanging from a magnetic hook stuck to the bottom
of my saw and another I carry around for other tools.

"Delbert Freeman" <[email protected]> wrote in message
news:[email protected]...
>
> Currently, I have a HF 1200CMF blower(off their larger dust collector)
> set up to draw through a cyclone and discharge outside the building into
> a small collection building. The draw of this unit is not bad, but I
> have 7 drops in the shop and would like to upgrade the airflow. The
> tubing in the shop is 4" PVC with flex hose going to each drop and metal
> blast gates from Lee Valley.
>
> Now for the question:
> If I got another blower, built a manifold and had both blowers drawing
> out of the manifold, would my CFM be substantially increased? In
> addition, would the 4" pipe handle the increase or would I have to
> upgrade to 6"?
>
> The reason I as is that American Woodworker has a coupon from HF with the
> whole dust collector at $139.95.
>
> Thanks
>
> Deb

If I read this correctly, you want one manifold and two DC's drawing from
it. What you first have to do is find a way to keep one DC from sucking
the opposite way through the other DC. I can see balance problems at times
depending on what gates are open. IMO, you'd do better running two smaller
systems rather than try to make a booster either series or parallel. In
any case, larger pipe would be needed to do justice to the system.

On Sun, 14 Mar 2010 08:19:35 -0500, Delbert Freeman
<[email protected]> wrote:

>
>Currently, I have a HF 1200CMF blower(off their larger dust collector)
>set up to draw through a cyclone and discharge outside the building into
>a small collection building. The draw of this unit is not bad, but I
>have 7 drops in the shop and would like to upgrade the airflow. The
>tubing in the shop is 4" PVC with flex hose going to each drop and metal
>blast gates from Lee Valley.
>
>Now for the question:
>If I got another blower, built a manifold and had both blowers drawing
>out of the manifold, would my CFM be substantially increased? In
>addition, would the 4" pipe handle the increase or would I have to
>upgrade to 6"?
>
>The reason I as is that American Woodworker has a coupon from HF with the
>whole dust collector at $139.95.
>
>Thanks
>
>Deb


With two DCs, there is going to be a pull against each other. Dont
think it is practical either. But as Ed mentioned, have two separate
systems with shorter runs and implement anything that decreases
turbulance.

I still move a short flex hose from one machine to another with a 1.5
HP PennState DC on wheels, just not powerful enough for a network of
piping but does an effective job on one machine. My DC "upgrade" was
the addition of a LongRanger remote 220v relay.