Thread: Dust Extraction

Wayne

Do you know the size of your impeller?

Is it made of steel?

Do you know if the impeller is different for the 3 hp motor.

Although I have looked at some DC units and guessed at sizes I could not be too sure of sizes.

Cutting the template of the Cyclone to me seems the easier part of the project.

Thanks

Pulpo

Pulpo,

I actually got all this info from Carbatec before purchasing.

Both the 2hp and the 3hp use the same 12" Impeller. They are also the Backward Curved type that Bill recommends and are made of heavy gauge steel. They are designed for material hits so are very, very strong.

BTW: The arbor size is 3/4".

Size of a 2 hp impeller for a dust collector with minimum ducting or flex hose should be 12" in diameter with six or eight blades each 3" tall. See the pictures on my web pages for blade shapes and such. For a 2 hp impeller driving a cyclone and a little ducting it should be a 13" diameter impeller.

For a real 3 hp motor driving a cyclone and a full two-car garage sized shop should be a 14" impeller. This is what I recommend to those who ask. Here are the dimensions on my Jet 14" impeller that Jet sells with their 3 hp dust collector. The base is made of 3/16" thick steel and the vanes from 1/8" thick steel. Each vane or blade is held on with four steel rivets. The center arbor presses into the a hole on the center of the impeller and then is held in place with four bolts. There is one long set screw that goes in and hits the 3/16" keyway and another placed 135 degrees away that presses against the motor shaft.

bill

Bill,

The problem is getting a Jet Impeller in Australia as a spare. I emailed their agent here (Gregories in Bris. - Woodman Group) and they did not carry them as spares, did not want to order one and thought that it would be quite expensive anyway. They suggested I just buy the 2hp Jet D/C as it was very good (in their opinion).

These guys make their own Cyclones but only BIG commercial units.

Wayne,

The impellor I have on my Hafco machine looks very simlar to the one in Bill's picture with a dia of 12". As I said it is mounted on a 2hp motor 7.5A 2950 rpm motor. Is that in the ball park of what you are running?

At the moment apart from the lathe and a scroll saw my other equipment is moveable, table saw & router table. So at this stage I'm thinking that I can get away with about 6m of 6" main duct with maybe 5x 6" 45deg lateral tees with 6" flex to machines so I do not see a high inherent SP loss.

If I go to a paper cartridge type filter on the top of the single stage collector, I am wondering if a relatively simple drop box/separator will still give me enough suck?!?!

OK I may add a band saw and othe bits but I can only ever use one at a time!!

Just trying to sort through this maze - got a copy of Nagys - + a whole lot of letters - book from the library but I suspect he is still very much pre fine dust extraction so the advice may be limited.

Jamie.

Jamie,

That is exactly what I am running as mine is the Hafco (Hare & Forbes) 2hp which are identical to the Carbatec, etc. economy ones.

I totally agree with Bill regarding going for 3hp and 13/14" impellers it just that I found it impossible to get one in Oz at a reasonable price. The same goes for the Farr/Torit filters - $250++ when they are $50-$70US!!! Gives you the !

The other thing is that the 3hp draws over 9.5 amps so that knocked it out for my standard household power supply.

So, that is why I went the 2hp/12" combo. One day, when I build a proper shed down the back I WILL get it wired up with enough juice (3 phase maybe) to run 3hp/14". When that happens I will build a new Cyclone in the optimum height (3:1 Cone to Drum).

Mine works fine as I have a small shop and everything is pretty close together. It is probably not getting 100% of the fine invisible stuff but it would be pretty close (guessing 98%+).

Wayne

Have you enlarged your inlet to the 6"?

If I did that and just went for a drop box/seperator would I get enough suck???!! You seem to have plenty so the extra drop on a simple separator is going to cost me what???

Sorry but I have a boat as well and you know what that stands for!!!

Bring Out Another Thousand!!!

Besides on a fine day it is a big decision to turn or to launch - f#$% lifes full of difficult decisions!!!

Jamie,

I forgot to mention - when you say simple drop box/separator will still give me enough suck you mean a Trash Can separator inbetween the D/C and the Machines? If you do, forget it as the 2hp will just empty it as the suction is to high for these things -check Bills FAQ at http://cnets.net/~eclectic/woodworki...lone/FAQs.html and search the page for 'separator'.

As for the Big cartridge filters that replace the Bags - for the money you pay for them you would have the Cyclone with a proper filter! And I don't think those $400 Paper ones from H&F or CT are really 1 micron even if they say they are. Jet's one is 2 micron real and it is lots more money ($686 at Gregories) so I cannot believe that the cheaper paper ones are 1 micron.

Build a Cyclone - you will love it and so will your lungs/family/etc.

Jamie,

I was typing the last response while you were posting but I seemed to answer one of your questions.

As for enlarging the Blower inlet - No, not yet. I don't want to stuff up the warranty as they H&F guys know I was using it for a Cyclone. I may do in a years time when its up.

Wayne'

Thanks - noticed that - Think my first approach will be to install a modified inlet plenum which I should be able to do with a ply and 6" piece of pvc arrangement - if I have a problem then I can reinstall the 5" factory job. Will also look at upgrading the transfer duct from 5" to 6" between the fan housing and the separator.

Mind you I turned a bowl from an unidetified timber today - pine-ish but no nose to confirm it, and the shavings were like steel wool!!! Even a bowl gouge with the finest cut produced a mat like angel hair, that did not get past the guard on the collector and reinforces the need for a cyclone - damn it - I want to turn not spend more time rooting aroung with more equipment installations. Thanks again for you input,


Jamie.

Wayne'

Thanks - noticed that - Think my first approach will be to install a modified inlet plenum which I should be able to do with a ply and 6" piece of pvc arrangement - if I have a problem then I can reinstall the 5" factory job. Will also look at upgrading the transfer duct from 5" to 6" between the fan housing and the separator.

Mind you I turned a bowl from an unidetified timber today - pine-ish but no nose to confirm it, and the shavings were like steel wool!!! Even a bowl gouge with the finest cut produced a mat like angel hair, that did not get past the guard on the collector and reinforces the need for a cyclone - damn it - I want to turn not spend more time rooting aroung with more equipment installations. Thanks again for you input,


Jamie.

Jamie,

Do what I (and everyone else I know) did with the safety grid on the Blower inlet - cut it out! Safe so long as you have pipe always attached and stops the D/C blocking up every five minutes.