Shopsmith Forums

charlese wrote:I went from the standard - small size dust hood to the medium sized and was very pleased with the increased air flow. Lately, I changed to the large dust hood and was wowed with the yet increased air flow. The dust pickup with the large hood has been enhanced quite a bit. No measurements - just observations.

Concerning dust buildup inside the hood - the larger hood is much easier to shake the stuff loose than either of the smaller hoods. There is even a zipper fly (about 10" long) on the large hood. I supposed I could reach in there with a scraper and actually scrape down the walls of the hood. Haven't done that but am thinking of opening the zipper a peering inside.

I seem to remember reading somewhere, likely here that the "cake" buildup on the inside of the bag enhances the dust removal from air aspects of the large bag. Yeah I had to unzip my bag to peer inside once. Looks pretty cool. Jim

fjimp wrote:I seem to remember reading somewhere, likely here that the "cake" buildup on the inside of the bag enhances the dust removal from air aspects of the large bag. Yeah I had to unzip my bag to peer inside once. Looks pretty cool. Jim

Enhanced dust 'removal'(captures smaller particles) obtained by cake buildup is most likely at the expense of air 'flow'.

The larger the bag, the finer the filtering(not sure why?).

The larger the bag the more area for the air to pass through so increased air flow makes sense. However, are the bags using the same filter 'media'?

Perhaps the larger bag results in lower air velocity through the bag 'sides'.

JPG40504 wrote:...The larger the bag the more area for the air to pass through so increased air flow makes sense. However, are the bags using the same filter 'media'?

Perhaps the larger bag results in lower air velocity through the bag 'sides'.

Yes, agree! I once posted a long diatribe telling that a larger bag will produce less back pressure therefore more air flow. Nick quickly chimed in and said the large bag has a finer weave in order to reach the rated dust removal. Haven't found those posts

Now that I have the larger bag, I somewhat disagree with the finer weave, (can't prove it) but it does easily remove more dust quicker.

charlese wrote:Yes, agree! I once posted a long diatribe telling that a larger bag will produce less back pressure therefore more air flow. Nick quickly chimed in and said the large bag has a finer weave in order to reach the rated dust removal. Haven't found those posts

Now that I have the larger bag, I somewhat disagree with the finer weave, (can't prove it) but it does easily remove more dust quicker.

Probably finer 'weave' AND more air flow.

How does one 'weave' felt?

I think of felt as being 'pressed'.

I still think there is plenty of room inside the DC3300 to install baffles that would cause a vortex effect and may help even more in dust removal.

As i understand it the vortex idea is to spin the air which by centrifugal force eliminates some particals but also lenghtens the air flow thus slowing it down so the dust has more time to fall out.

The area just under the mid section of the DC3300 seems like an ideal spot to have a vortex funnel set in place

Ed in Tampa wrote:I still think there is plenty of room inside the DC3300 to install baffles that would cause a vortex effect and may help even more in dust removal.

As i understand it the vortex idea is to spin the air which by centrifugal force eliminates some particals but also lenghtens the air flow thus slowing it down so the dust has more time to fall out.

The area just under the mid section of the DC3300 seems like an ideal spot to have a vortex funnel set in place

The main problem in doing this seems to be capturing the air flow inside of the machine and channeling/ducting it to a funnel.

Ed,
yep it is an either or... Dust deputy (which has the virtue of being 'off the shelf') OR a Thein Baffle, which is a shop build project. A third option is to build a chip drop box. Somewhere down in southeast GA is an incredible shop built by a very talented fellow name Marty. I started following his build on the Sawmill Creek forums, then followed him over to Family Woodworking.org (where I'm currently a Moderator). Marty built a Dream Shop, documenting it step by step from concept to finished product. His dust collection system is a thing of beauty, using industrial grade piping beneath the floor and a plenum chamber and a drop box which does the same task as the dust deputy.
the thread where it starts seriously talking about the dust collection is here and for those who are crazy enough to read the second half of the build (first half was on sawmill creek, and while that's still in existence, Marty left SMC for Family Woodworking) can be found here.

I'm leaning towards a dust deputy at the moment, I know right where their HQ is, so shipping would be next to non-existent, and I know my fabrication skills... off the shelf is a big plus in my book.

Ed in Tampa wrote:I still think there is plenty of room inside the DC3300 to install baffles that would cause a vortex effect and may help even more in dust removal.

As i understand it the vortex idea is to spin the air which by centrifugal force eliminates some particals but also lenghtens the air flow thus slowing it down so the dust has more time to fall out.

The area just under the mid section of the DC3300 seems like an ideal spot to have a vortex funnel set in place

The DC3300 'blows' down from an off center location into a flimsy plastic(not a good cylinder/cone) bag.

I am quite curious how one would 'baffle' it effectively. An additional 90 degree deflection would be needed. And the center is plugged by the motor/blower(the center of the thein/vortex is the air escape path).

JPG40504 wrote:The DC3300 'blows' down from an off center location into a flimsy plastic(not a good cylinder/cone) bag.

I am quite curious how one would 'baffle' it effectively. An additional 90 degree deflection would be needed. And the center is plugged by the motor/blower(the center of the thein/vortex is the air escape path).

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.

I don't have a DC3300 because a planer that I purchased came with a free Grizzly 1hp DC. I just wanted to offer the plastic separator lid as an option to the dust deputy.

The lid fits on a standard metal trash can (33 gallon if memory serves) and has 4“ inlets and outlets for hose connections. Standard metal cans are not easy to find and you can't use the plastic ones because the vac pressure will cause them to collapse.

At any rate, this system works great for me. Plus, an added benefit is less emptying of the trash can because it holds more. I have noticed that it is less effective when the trash can is about 1/2 full...probably because of lack of airflow.

I keep telling myself I will check my bottom bag every month to see how full it is (is a cloth bag) but I haven't checked it in a long time.

I just wanted to offer an alternative to the dust deputy. I'll happily take and post pictures if you'd like.

Thanks
Geo