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Here's another vote for it makes no real difference.

I posted the results of testing I carried out a while back on the last post of this thread ...

Hi Randall,

Of what it's worth, I reckon the whole line about having to match cyclone rotation with fan rotation and how straightening vanes will counteract this effect is a myth. I used to...

Hi Kevin. This is without doubt a suction volume problem as you suspect. You don't say what extractor and duct size you have but I'd guess you have 2HP or less and/or 4" ducting.

i used to have a...

Hi Mike. I usually give the mating faces of the flange a sand with 100 grit paper and then bond with higher viscosity epoxy. For extra strength, a fibreglass bandage can be applied down the inside...

Hi Alan. Yes this is correct. With the female mold, the inside is rougher. This is easily fixed with a sand with a disk sander a few days after demolding when the epoxy is nice and hard.

Thanks everyone for your great feedback.

In response to Mike's query I'll try to provide a brief description on two of the methods I've used for producing inlets and transitions etc.

The first...

On a separate thread I posted some pictures of my fiberglass shop made machine dust fittings with a passing reference the cyclone I’d built. A number of people have taken the bait and requested more...

Bill,

Thanks for your kind works. Yes, these were built by me and I still have the moulds. Also my fiberglass cyclone which is visible in the background in the first two images.

If any one is...

Hi Peter.

I also have a small shed with machines connected individually to a shared 6" flex. I rebuilt my machine outlets with a tapered spigot which allows for easy fitting of the flex which...

Hi Yonak,

The more correct description is probably "exhausting outside". The fan, cyclone and dust bin are usually located inside, But instead of having filters, the fan exhaust is directed...

As someone who has gone through the process of converting my 2HP bagged 'dusty' to an outside vented cyclone I can definitely recommend this move. Better air quality, cleaner shop, easier bag changes...

Albert,

A few things you could consider before you set off spending some big $$'s which may not even solve your problem.

With a 20" fan sucking through 10" ducting, I'd guess that the...

Albert,

If I remember correctly, your motor is 4 pole running at about 1400 RPM. I believe this will be the limitation on your system. Replacing the motor with a 2 pole motor running at 2850 RPM...