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Yet another HF Dust collector post...

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Forum topic by jbuszkie posted 03-09-2017 10:59 PM 1103 views 0 times favorited 18 replies Add to Favorites Watch
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jbuszkie

9 posts in 1064 days


03-09-2017 10:59 PM

I’m in the thought process of enhancing my HF DC…

I’m going to add the Thien baffle separator on top of the 30gal metal can trick.

I plan on coming in on the side of the separator and not the top doing a 90. my biggest question is what size
do I make the inlet? I have 3 options: 4”, 5” 6”.

As you guys know the stock inlet is just under 5” the to the dual 4” ports. If I just go 4, then feel I leave something on the table in term of air flow. I also thought about opening up the inlet to a true 6” by replacing the inlet plate on the blower like I’ve seen some folks do. Then I can get a true 6” to 2×4” adapter. But the output of the blower is rectangular going to 5”, right? My plan was to exhaust to the HF donut. Since I can’t change the donut to 5” will I gain anything by making the inlet to 6”? Is my safest bet just making the separator 5”

My use case is one tool at a time with one of those dust right 4” collapsible hoses moving from tool to tool.
All my tools are mobile and get moved around so hard piping isn’t an option today. The dual 4” would be useful for the table saw. 1 for the cabinet and 1 for the top of the saw (which I don’t have right now- just collect from the base).

I also plan on getting the upgraded impeller as others have done as well. And I will chuck the bag and finally put on my wynn filter!

I’m imagining something like this:

But with the separator on the top of the can.

Am I over thinking this for my hobbist use case? :-)

Thanks for all thoughts!

Jim


18 replies so far

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WhyMe

910 posts in 1397 days


#1 posted 03-09-2017 11:08 PM

I don’t see much point in increasing the intake port to larger than 5* if the output port is still 5”. Also is there any proof that increasing the impeller size helps on that DC. I would think the motor HP is not sufficient to power a larger impeller.

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jbuszkie

9 posts in 1064 days


#2 posted 03-09-2017 11:18 PM

There have been a couple other places where folks have upgraded the impeller and it’s a significant improvement.
With no overload of the motor..

This has been years now and I haven’t heard anything bad. The impeller is undersized in the HF model..

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Jimintomahawak

57 posts in 312 days


#3 posted 03-09-2017 11:30 PM

Where do you get the oversized impellers

-- Laziness drives creative thinking...

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jbuszkie

9 posts in 1064 days


#4 posted 03-09-2017 11:34 PM

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Redoak49

2894 posts in 1825 days


#5 posted 03-10-2017 01:49 AM

I have been always curious of some of these upgrades. Has anybody actually accurately measured the performance of the HF dust collector and the effects of these improvements.

Wood magazine tested this dust collector and the best flow was about 600 cfm and a max static pressure of 7”. With a 4” duct you get reasonable air velocity but with a 6” duct, the velocity is really too low.

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jbuszkie

9 posts in 1064 days


#6 posted 03-10-2017 01:03 PM

If I can figure out how to measure the CFM cheaply, I’ll document it. For pressure I can probably get an inches of water delta.. hmm.. lab experiment? :-)

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Redoak49

2894 posts in 1825 days


#7 posted 03-10-2017 04:28 PM

You can use a water manometer to measure static pressure. Use that and the performance curve in the Wood Magazine article from 2008.

Also, if you check my blogs, I show how one can do this.

How to Cheaply and Easily Measure Dust Collector Performance

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therealSteveN

66 posts in 411 days


#8 posted 03-10-2017 04:44 PM

Redoak49 you invite people to follow your blog, yet you provide no link to do so. Probably an oversight ehhh?

-- Think safe, be safe

View jbuszkie's profile

jbuszkie

9 posts in 1064 days


#9 posted 03-10-2017 04:47 PM

If you click on the blog link by his user name it gives all the blogs..

I think this was the one he was referring to…

View Bob5103's profile

Bob5103

81 posts in 670 days


#10 posted 03-10-2017 04:50 PM



I have been always curious of some of these upgrades. Has anybody actually accurately measured the performance of the HF dust collector and the effects of these improvements.

Wood magazine tested this dust collector and the best flow was about 600 cfm and a max static pressure of 7”. With a 4” duct you get reasonable air velocity but with a 6” duct, the velocity is really too low.

- Redoak49


It depends on what “accurately measured” means, when I swapped impellors on mine I used a cheap anemometer to measure the before and results. I wasn’t expecting exact results, just establish a baseline that I could compare the before and after. My unit uses a SDD with 5” metal ducting and 3 drops and exhaust outside. My longest run is about 41’. Before the impellor swap I averaged 325cfm for the 3 drops. After the average was 640. I also used an amp meter to measure the before and after amp draw.
Before: Startup amps, 14.27 Running 10.17
After: Startup 18.7, Running 12.7
I did this for my own edification, because everybody will get different results. I am pleased with how it turned out.

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jbuszkie

9 posts in 1064 days


#11 posted 03-10-2017 04:54 PM

It depends on what “accurately measured” means, when I swapped impellors on mine I used a cheap anemometer to measure the before and results. I wasn t expecting exact results, just establish a baseline that I could compare the before and after. My unit uses a SDD with 5” metal ducting and 3 drops and exhaust outside. My longest run is about 41 . Before the impellor swap I averaged 325cfm for the 3 drops. After the average was 640. I also used an amp meter to measure the before and after amp draw.
Before: Startup amps, 14.27 Running 10.17
After: Startup 18.7, Running 12.7
I did this for my own edification, because everybody will get different results. I am pleased with how it turned out.

- Bob5103


Do you have the HF model??

I think I may invest in a cheap anemometer. If I swap the impeller then the there I’ll have to create a new curve!

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Redoak49

2894 posts in 1825 days


#12 posted 03-10-2017 04:56 PM

I used a hot wire anemometer and a digital device to measure static pressure. I also did three runs to develope my performance curve.

I also tried using one of the fan type anemometers and it gave me all kind of results.

I put my results in a blog titled Fan Anemometer to Test Dust Collector Performance

I found that you could get all kinds of results depending on how you held the fan anemometer over the end of the pipe. I could not hold it by hand in a steady position to get any kind of reasonable results.

I did add the links but as someone mentioned, you can find all my blogs by clicking on the link to blogs under my name. I have trouble adding links when I am working on my tablet or phone.

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jbuszkie

9 posts in 1064 days


#13 posted 03-10-2017 04:59 PM



I found that you could get all kinds of results depending on how you held the fan anemometer over the end of the pipe. I could not hold it by hand in a steady position to get any kind of reasonable results.

- Redoak49


I think I’ll make some sort jig to insert inline to get consistent results with the $22 meter I think I’ll buy.. But hey.. This is for science, right? :-)

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Bob5103

81 posts in 670 days


#14 posted 03-10-2017 05:08 PM

Do you have the HF model??

I think I may invest in a cheap anemometer. If I swap the impeller then the there I ll have to create a new curve!

- jbuszkie

The HF unit is just their standard 2hp unit. I don’t know the model #
This is where I got the Rikon impellor.
Rikon Service #: 877-884-5167 M-F, 8-5 EST. ask for the impeller for 60-200.

View Rob_s's profile

Rob_s

171 posts in 458 days


#15 posted 03-10-2017 06:17 PM



I don t see much point in increasing the intake port to larger than 5* if the output port is still 5”. Also is there any proof that increasing the impeller size helps on that DC. I would think the motor HP is not sufficient to power a larger impeller.

- WhyMe

this is a pretty good video on one of the best mods I’ve seen.
https://www.youtube.com/watch?v=8v5079FPCsY

-- www.facebook.com/therealbnrlabs

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