how to modify 3HP Grizzly dual arm DC for sitting ontop SSD XL?

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Forum topic by Holbs posted 10-28-2018 08:07 PM 997 views 0 times favorited 2 replies Add to Favorites Watch
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2258 posts in 2631 days

10-28-2018 08:07 PM

I am purchasing the Oneida Super Dust Deputy XL to replace my aging beat up well used Thein Baffle top hat that has served me faithfully for the last 4 years. Lighter weight, easier to handle, and I’m hoping will not clog as the Thein Baffle inherently does with it’s cut out slot when it comes to planer/jointer chips. My dust collector is a 3HP dual armed Grizzly (unknown model number due to badge missing when bought used). All infeed HVAC ducting is 6”.
All of this combined takes up an irritating amount of real estate.

A number of years ago, I resigned myself to this setup taking up space. But this fall season, I’ve been really concentrating on freeing up real estate (doing a pretty good job at it too! More on that later in blogs & projects).
I approached the idea of reconfiguring the DC to sit on top of the Thein Baffle for 5 minutes, but moved on to other things.
Now, I’m trying to do things right with dust collection responsibilities. All dust collectors I see sitting on top of their Thein Baffles or SSD or cyclones only have 1 outfeed extending arm, not two like my DC has.
So my question is… could I disable one of the arms / close it off, double up the filter for the remaining arm? if you have a 3HP (do they make 2HP dual arm?) DC and sits ontop of your separator, how did you modify/take into consideration the two arms?

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

2 replies so far

View CaptainKlutz's profile


2208 posts in 2096 days

#1 posted 10-28-2018 09:32 PM

IMHO – If you want smallest footprint, Do not use the existing square tube duct work & filter bases.
Just use conventional blower on top of cyclone design, and duct outlet air to side and down into 2 filters stacked with a dust tray on bottom. It might feel like a waste of fancy hardware, but need to trash it if you really want smallest foot print.
All you need is square flange to round tube adapter, short piece of round outlet tube, and a 90, then make some plywood mounting rings to support weight of filters, and you’ll have a conventional 2 column cyclone dust collector.

There are many ways to adapt square flange to round tube.

1) Oneida sells square to round adapters for blowers. Believe the Grizzly G0562/G1030 3HP units used either a 7 or 8 inch inlet/outlet? Regardless, measure and call Oneida to get right one.

2) Spiral tube and Norfab also sell square flange to round tube adapters, but tend to be more expensive than Oneida

3) If you have a local sheet metal fab shop, they can also easily make an adapter.

4) Once you are resigned to not using the existing duct, you could also cut off the flange and small section of duct, and make your own round tube conversion from some sheet metal.

5) One last idea: New Grizzly 3HP cyclone units have a square to round port adapter on them, and is listed in parts list. Might be able to call Grizzly with dimensions of your square port, and get an actual OEM adapter like the one used on current G0441 cyclone?

PS – I have not attempted this conversion, but I plan to do it.
Still looking for used 3HP dust collector at right price.

Best Luck.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View Holbs's profile


2258 posts in 2631 days

#2 posted 10-28-2018 09:49 PM

Capt…great ideas. I have no issues at all abandoning the arms & collars to save up on real estate. I like your last idea of Grizzly cyclone square to round adaptor. Going to have to go measure existing square exhaust outlet and see if they have same measurements.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

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