Timecon DC-1750. A question on design and a deficiency?

**woodPixel** · 20th August 2017, 02:35 AM

Ive just bought and installed the Timbecon DC-1750 With massive 1220mm tall pleated filter.

It is sold as being computer modelled and super advanced. Optimised I think it says.

It is incredibly powerful compared to my old 2hp generic. It is obviously far more powerful, for as a test it evacuated my cabinet saws impressive leftover dust-dune in under a minute.... Clean as a whistle. Happy!

There is a design element that bothers the hell out of me... Where the blower mounts directly to the body it:

-- attaches directly at 90 degrees, and
-- the inside of the body/barrel is simply a tube

Now, I expected that the inlet to the body would decline by 15 degrees to impart a downward velocity to incoming material. I see this design on Bill Pentz's cyclone. I see it on the Clearview and I see it on the better cyclones. So, why would that not be part of a dust collectors design?

Now to the part that REALLY bothers the hell out of me.... Dust comes in and only falls when it is heavy. All the rest goes straight up in to the pleated filter.

There is no internal ring (or "Donut") inside the barrel above the inlet, with a hole in the centre.

This is present on my generic 2hp which must be over 10 years old. It makes sense. It forces the material to loose energy and fall, where lighter cleared air swirls up the centre hole to the filter.

Why would they have left this off? Is a clear unimpeded tube better? (I think not, for a quick test of big bucket of dust left a considerable amount of it in the filter).

Would it be in my interest to make one and install it?

Lastly, if I were to add a "donut", should I also add a "wok"?

These articles discuss woks and you see the "donuts" present on every single one of them...

Shop-made Vortex Dust Collector Woks On - Popular Woodworking Magazine
Dust Collector WOK! - Baffle / Vortex Cone and Table Saw Collection: 5 Steps (with Pictures)

Thanks in advance for all wisdom.

edit1: donut may be called a separator ring?

**Lappa** · 20th August 2017, 11:48 AM

Just had a look at my 2hp and the inlet on that is at 90o BUT it does have the separator ring to direct the airflow.

I would think that without a separator, you would want some degree of downward flow otherwise you are just redirecting the air back into itself. Can you see a distinct downward spiral action in the collection bag? I can definately see one in mine.

I put my cleaned pleated filter back on last week (that's another story) and I was astounded by.
a) how much dust was on top of the separator ring - provably 6mm plus
b) how much dust cane out of the needle felt filter when I removed it.

i would say that the only thing in the collection back is chips and all the dust is up above the separator. Sure some of it falls down when you turn it off but up it goes as soon as you turn it on.
I took some back pressure manometer readings just before the entrance to the separator (not an ideal location but it's the easiest) with
a) no filter, just the collection bag
b) needle felt filter fitted
c) "blocked" pleated filter
d) cleaned pleated filter straight away and after 19 minutes of running

I'm going to fit the wok next week and see
a) if it reduces the dust above the separator
b) if it affects the back pressure, which is my main concern

I'd be interested to hears other views

**woodPixel** · 20th August 2017, 12:54 PM

I was thinking of building a Thein baffle either underneath the inlet or directly into the barrel itself.

If its exterior then it will be a shorter storage unit, but at least it will be easy to clean. Not too hard either, as I can use the nozzle to plug on the hose as the outlet. Just like this video: https://youtu.be/RpUbhA-6fbM

If it's inside the machine, I'm thinking of how the dust from the upper section gets to the lower area when it's cleaned.

Have to admit, not having a separator ring is very irritating.

**Lappa** · 20th August 2017, 04:11 PM

To my mind, the wok is similar to the Thein except the wok has a gap the whole way around the circumference instead of just a 3/4 of it. I have a home built small Thein on my 35mm vacuum cleaner and it works a treat. It catches all the chips, shavings and most of the dust. Only the very fine dust seems to get through to the VC. I know there will be the unbelievers

but the system is regularly checked for leaks and the area it sits in with the VC stays remarkably clean. There is a filter on the outlet of the cyclone VC which does require changing every 6 months and the outlet is directed out of the shed for good measure.
My only concerns with additions to my main extractor are a reduction in flow.

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Timecon DC-1750. A question on design and a deficiency?

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