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Posted: Sun Jan 06, 2013 10:45 am
by JPG
Ed in Tampa wrote:Redirect the off center outlet into the plastic bag by using deflection baffles aiming it into a vortex cone suspended within the plastic bag with the outlet at the bottom so exhaust air would have to travel from the fan into a vortex funnel eventually coming out toward the bottom of the pastic bag before it would turn and flow upward and out the dust cover at the top.
A 'vortex' type separator has the heavier debris 'fall' out the bottom after being 'thrown' to the outside of the cone, while the less dense air goes out the top after being 'migrated' to the center.
The DC3300 'throws' the air/debris mixture towards the bottom of the bag. The denser debris stays at the bottom, while the lighter air/dust reverses and heads for the top. All those 'baffles' and cones would accomplish is restricting the process.
Posted: Sun Jan 06, 2013 4:01 pm
by fjimp
I have enjoyed this discussion yet feel it time to add a fascinating point. Several years ago I was worried about larger debris destroying my DC3300 fan assembly. This purchased a spare which still resides unopened on a supply shelf. Once I ordered that replacement part, I also became more careful about NOT allowing larger items to be sucked up. Shopsmith really has built a tough and highly efficient dust collector. The only thing that I would change in regard to how they sell them, would be to offer either the small or large bag as original purchase option. I still have that small bag and feel I wasted money and materials when forced to purchase it. Jim
Posted: Mon Jan 07, 2013 3:55 am
by JPG
fjimp wrote:I have enjoyed this discussion yet feel it time to add a fascinating point. Several years ago I was worried about larger debris destroying my DC3300 fan assembly. This purchased a spare which still resides unopened on a supply shelf. Once I ordered that replacement part, I also became more careful about NOT allowing larger items to be sucked up. Shopsmith really has built a tough and highly efficient dust collector. The only thing that I would change in regard to how they sell them, would be to offer either the small or large bag as original purchase option. I still have that small bag and feel I wasted money and materials when forced to purchase it. Jim
The same scenario applies to most of the 17 most often . . . parts. They all are easily damaged and prudent care may prevent their demise(or getting 'lost').
I agree re the bag!
more air flow???????
Posted: Tue Jan 08, 2013 5:23 pm
by oldc6
Installed the tall upper bag on dc300 today. I noticed with only one hose
connected and other two plugged the plastic bag has no swirling action.
open other two ports and it looks like a tornado in plastic bag.. So, it would
appear that we would have more air flow with the ports open. Any theories ??? pictures are not real clear but, you can see on the one that the
sawdust is lifted up......[ATTACH]19870[/ATTACH]
[ATTACH]19871[/ATTACH]
Posted: Tue Jan 08, 2013 8:44 pm
by JPG
No theories, just facts.
More 'ports' open = less resistance to flow.
More hose = more resistance.
Bigger bag = less resistance.
It all 'interacts'.
Posted: Tue Jan 08, 2013 8:52 pm
by fjimp
I claim no superior expertize. However my testing illustrated the best mix of sawdust pick up with a hose on one open port, a second port full open. Third port closed. However if a long segment of hose connected (as when I reach a lathe 20' from the 3300), I need the third port 1/2 open as well. I hope this is somewhat helpful. Jim