I have had my HFDC for several years now, originally stock, then with the Wynn 35A canister, and finally with a couple of home made cyclone type mods. My last mod finally got it built in and piped. Well, we sold that place and bought a smaller one that promises a permanent shop that doesn’t turn back into a garage every night so the DC had to be moved and I can’t do that without tinkering a little more with the system so here is the new setup that I have been using for a couple of days now.

This picture shows the trash can that collects the big stuff. If you look closely you will see it also gets a lot of the fine dust, most in fact. It is attached to my piping with a friction fit between the PVC and the inlet elbow. It is sealed on top with a piece of pipe insulation.

It sits a couple of feet from a support frame screwed to the wall.

The can is covered with a disc of MDF a with a hole cut to fit a five gallon pail with the bottom removed. The pail is also sealed with pipe insulation….

… and seated snugly on its top ring. My idea here is that a large volume column of rising air from the bucket will travel at slower speed than a smaller diameter one and carry less dust with it. ….. seems to work.

Next is the plywood base that everything else mounts on. A quick tap on the friction fit PVC pipe and you can lift the trash can end an inch or two and remove the can very easily.

Here the motor/fan unit has been placed on top. It is sealed with some self stick weatherstrip. It’s considerable weight makes all the bits below seal very well. A heavy duty trash bag has been fitted in the other hole.

Now the diverter ring is in place and the securing strap attached under the plywood to hold the bag.

Finally the filter, a Donaldson p181099 is added and secured with light chain and turnbuckles. Again a little weatherstripping seals the joint.

Outside the room my minimal piping serves the ShopSmith with a flex hose that reaches all the various places that the SS tools emit dust and shavings.

The hose swings up out of the way when not in use.

Here she is running with the bag all puffed up.

That’s it for the setup. As for the performance I can say the following:

1) For my purposes this system works wonderfully. I get only a very small amount of fine dust in the bag (which could be much smaller) and I get NO fine dust floating around when I’m using my tools, even MDF dust on the SS tablesaw.

2) The p181099 (99.9% efficient @ merv 15) probably gives me only half of the surface area that the Wynn 35A did but it is many times the area of the original bag and to be honest, I can’t tell the difference from the Wynn.

3) The Donaldson filter can be purchased locally in almost any city and costs under $50 compared to over $175 for the Wynn.

4) If you do want to have the equivalent area of the 35A, the p181038 is under $100 and equally accessible.

The old and the new

That’s a wrap I know the subject of HFDC mods has been done to death but maybe some of you can take something from this one. The only thing I may still do is to put a vortex cone in my separator ring to reduce the fine dust making it to the filter but so little does that it isn’t a priority.

Thanks for looking in.

Paul