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What does adding a wok or frying pan to a HF Dust Collector accomplish?

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Forum topic by JesseTutt posted 543 days ago 1350 views 0 times favorited 9 replies Add to Favorites Watch
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JesseTutt

803 posts in 747 days


543 days ago

Topic tags/keywords: dust collection harbor freight wok

As time permits I am designing changes to my Harbor Freight (HF) Dust Collector (DC). As I search for information and ideas I have come across several posts pertaining to adding a wok (or frying pan) to the bottom of the metal ring close to where the plastic bag attaches. Unfortunately, I have not figured out why. Would you please explain why I would want one and if there are any design parameters to placement of the wok?

-- Jesse, Saint Louis, Missouri


9 replies so far

View DIYaholic's profile

DIYaholic

13363 posts in 1312 days


#1 posted 543 days ago

The wok/frying pan modification is supposed to help improve the seperation of the fines into the collection bag and keep them from clogging up the filter. I have not done that mod, as I’m currently building a Thein Top Hat pre-seperator. The advantage of the pre-seperator is that large debris (& fines) is seperated out BEFORE entering the blower/impeller, thus preventing potential damage to the impellor. As an added bonus, it is easier to empty the trash can collector bin than changing out the plastic bag! Win-Win!!!

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procratination a bad thing?

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JesseTutt

803 posts in 747 days


#2 posted 543 days ago

Thanks Randy,

Do either of the modifications you mentioned (wok or thein) affect the cfm or static pressure?

-- Jesse, Saint Louis, Missouri

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DIYaholic

13363 posts in 1312 days


#3 posted 543 days ago

They both are a restriction to air flow. I don’t know by how much. However, by seperating out the fines, the filter does not clog as quickly (in between filter cleanings), so air flow (although slightly reduced) is maintained for a longer period of time.

Here is a link to Phil Thien's Discussion Forum, where you can further research your question.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procratination a bad thing?

View toolie's profile

toolie

1746 posts in 1265 days


#4 posted 543 days ago

i had posed that same question, JESSE, to phil on his forum. in condensed form, he noted that many users of his baffle use both enhancements in their DC efforts. the baffle within the DC’s drum ring (the frying pan/wok) enhances the separation of collected material as DIY noted, sending more of it to the collector bag thereby keeping it out of the filter which maintains airflow and suction (BTW, a thein shaped flat baffle could be used within the DC’s drum ring instead of a pan. phil believes such a baffle would do an even better separation job than the pan or wok, which are proxies for a jet vortex cone).

phil further noted that many users of his enhancements use their separator only when using machines which generate large amounts of chips, like jointers and planers. but DIY is entirely correct that the separator before the blower will catch errant potentially damaging items sucked up accidently which the drum ring baffle won’t.

-- there's a solution to every problem.......you just have to be willing to find it.

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crank49

3380 posts in 1608 days


#5 posted 543 days ago

I haven’t measured it but , based on my experience I would estimate the Thein baffle would reduce the available static pressure by at least 2 1/2”, perhaps as much as 4” H2O.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

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toolie

1746 posts in 1265 days


#6 posted 543 days ago

crank49…. if those estimates are correct, what % would that represent of the total for the system those approximations are based on?

-- there's a solution to every problem.......you just have to be willing to find it.

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crank49

3380 posts in 1608 days


#7 posted 543 days ago

I’m assuming most hobby wood working shops have something similar to a 2hp single stage collector that folks are trying to tweek a little more performance out of.

Those machines all have their small differences but I think it would be safe to say they generally develope about 600 CFM at 10” static pressure. That 10” of static is what I am saying the Thein is reducing by 2 1/2”, so about a 25% reduction.

These would be the same machines that claim things like 1200 CFM , or may claim 14” static pressure. It’s important to note that they don’t say 1200 CFM at 14” static pressure. That is a very important fine point that most people overlook. My HF 2hp collector may be able to pull 1100 CFM it claims, but it would only do that with no filter and no ductwork and with the inlet grill removed from the fan intake and with the room air at 30 degrees and at least 7 of the 9 planets in alignment; so a meaningless rating. It also might be able to generate 14” of static pressure, but only while sucking 50 CFM through a 1” orfice. So, the bottom line is the real rating has to relate the air flow at a certain pressure to mean anything.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

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JesseTutt

803 posts in 747 days


#8 posted 542 days ago

Thanks everyone!

How do you calculate CFM and static losses due to plumbing? Right now I have two ten foot sections of black semi flexible four inch hose that I move between machines.

-- Jesse, Saint Louis, Missouri

View b2rtch's profile

b2rtch

4318 posts in 1685 days


#9 posted 542 days ago

I built and used such a system, I have now sold it.
I had a Thien separator in the trash can and a wok in the plastic bag under the filter
The wok idea comes Jet’s cone on some of their DC http://jettools-online.com/woodworking-tools/dust-collection/dust-collectors/dc-1200vx-ck3-dust-collector-2hp-3ph-230-460v-2-micron-canister-kit-new.html

It is supposed to prevent the dust to climb from the bag into the filter.
Does it work?
I think so but I am not absolutely sure.
It seems to stop the dust from climbing into the filter yet I still had quite a bit of dust in my filter.
My system was working very well for a small DC

-- Bert

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