Thread: The Generic 2HP DC

Woodpixel, did you end up buying the Sherwood dusty? If so, how's it going?

Originally Posted by Lappa

Woodpixel, did you end up buying the Sherwood dusty? If so, how's it going?

No, I didn't. I saw a review from another forumite and was really rather disappointed. The quality of finish, especially the internal air areas, and general workmanship was low and I was seriously questioning their figures given the design of the motor and the fact it has straight impeller blades.

BobL has sent me some of his 6" BMH's to put onto a new 6" flexi pipe (that's been here for ~8 weeks now and unused). I was thinking of upgrading the existing 2hp generic to 6" inlet and relocating the blower directly onto the body of the collector.

These mods, which will take time, will probably yield me something close to OK.

My biggest issue is noise. The current machine is quite quiet for some reason. The guys from Timbecon would not give me a DB reading, despite me asking several times, plus the straight fins will certainly howl.

Since I picked up second hand quite cheaply, it owes me little, so some experimental surgery shouldn't be too painful/expensive!

... Hence the purchase descission was killed.

There's a number of designs that I've seen on the Web for putting the blower into the collector. . Do you have any preferences?.
It's an interesting concept that I may even have a go at. If you don't mind, send me a PM if you find a design you like.

I'm getting the shed sub board wired this week, so I'll have 15A outlets to play with but I'd rather not buy a new Dusty if I can get mine to a reasonable standard.

Cheers

Originally Posted by woodPixel

My biggest issue is noise. The current machine is quite quiet for some reason. The guys from Timbecon would not give me a DB reading, despite me asking several times, plus the straight fins will certainly howl.

Dave Reed in Perth has one and I have loaned him my dB meter so hopefully he has a decent reading for it.
He has it in an enclosure and I have heard having it it did not sound too bad.

Dave has it set up with 6" ducting and I have tested his BS and WW lathe setups with a particle counter and they bot work fine. His main fine dust control is an evap AC will delivers 2400 CFM of air flow.

Lappa, that was my thought too. These are my ideas....

-- fit the motor to the body and make the joining aperture "bigger". I was just going right over the entire thread to see how it's done. I recall a picture from Trav, FenceFurniture and BobL on theirs, but can't find them yet (it's only a few minutes searching so far )
-- get a tall 1200mm PF to give it maximum flow.
-- mount the BMH to the motor

I was just reading the posts about amps drawn and Im afraid it's a bit beyond me.

My needs are rather simple: clean, quiet, good volume, PF excellence and easy to maintain...

Honestly though, I don't mind spending money on good gear, but it seems so incredibly unavailable here (I can't afford a big cyclone yet). I was previously looking at Oneidas website and some of the offerings in the US and our retailers are still foisting Neolithic crap on us. It makes me really angry.

Ill be happy to share what I end up doing with the "mating".

Originally Posted by woodPixel

Lappa, that was my thought too. These are my ideas....

-- fit the motor to the body and make the joining aperture "bigger". .

This is worth exploring.

As a rough guide it is usually not worth moving the exit line (red line shown in this diagram) past the inside edges of the blades.

impellerx.jpg

I'm ready to wok and roll

IMG_0589.jpg

The only problem is the woks in my Asian super market are all 18" (457 mm) and the wok the guys have been fitting are 14" (355 mm).

Theses are pictures of a modified unit with the 14" wok.

IMG_0252.JPGIMG_0251.JPG

I've done the math and the free area (annulus) between the separator sides and the outer edge of my 18" wok is 0.033m2.
The area of my 125mm inlet pipe is 0.01207m2 so hopefully there will be no flow restriction but I wonder if the wider diameter may interfere with the swirl action of the inlet and the sloping plate.

If so I'll cut it down to 14"

Regarding joining the motor to the body and making the aperture bigger - can the filter handle the increased air flow and disperse it without causing too large a back pressure? As I said in an earlier post, most larger units have 2 filters. Just thinking out loud.

I was going to buy one of these 1200mm ones - the PFC-21220: https://www.timbecon.com.au/extracti...ter-cartridges

Its mighty tall.

Too tall for my new dusty shed unfortunately Maybe I could dig a hole for the bags?

Just thought it would be interesting to get some figures between the pump and the filter to measure back pressure.
One of the reasons was to see if the wok made a difference but I though while I was there I'd get some readings for the partially blocked pleated filter as well.

With the good needle felt filter, the back pressure is 1.85" H2O (47mm)
With the partially blocked pleated filter the back pressure is 4.25" H2O (108mm)

In regards to System performance, it results in a drop in CFM of 39%

Originally Posted by Lappa

Regarding joining the motor to the body and making the aperture bigger - can the filter handle the increased air flow and disperse it without causing too large a back pressure? As I said in an earlier post, most larger units have 2 filters. Just thinking out loud.

No it doesn't handle the back pressure which is why the flow for the needle felt dropped from ~1100 at free flow to 840 CFM to with the needle felt filter and 925 CFM with a basic needle felt filter.
The 1200 mm high will help but I don't thinking opening it up any more all make much difference - the fan is close to maxed out and and at some point it's going to get worse.

So my concerns re opening my separator from 125mm to 150mm may be detrimental at worst and no real benefit at best?

Originally Posted by Lappa

So my concerns re opening my separator from 125mm to 150mm may be detrimental at worst and no real benefit at best?

Well that's not what I found,

The 125mm diameter exit (no bags) had a flow of 680 CFM.
When the 5" round to 25.25 sqin rectangular transition was removed I found it was ~1100 CFM (no filter) and 840 CFM with a needle felt filter.
I think this is worth having.
Bear in mind that this is with no machine connected.