Give me Your Opinion about this Idea

[David Kumm]

As Mike found out, a DC won't pull enough air through a small port because it is designed for low pressure so a shop vac impeller designed for high pressure is what is needed. Are you thinking that you could keep the filter, cut a hole in the side of the shop vac and put a 4" DC hose in it and run it with the vac on or only after it is shut off? Dave

[Mike Goetzke]

I had a 735 several years ago and seem to remember removing the internal fan (like many others) when using a dust collection system works much better.

Mike

[Jerome Stanek]

I would look at adding a Thein separator with a large collection barrel to the shop vac

[ken masoumi]

Get a dust deputy.
http://www.oneida-air.com/category.a...-B5C357DFE131}

+1.that's how I collect the dust from my DW735, I disconnect the hose that goes from DD to the shop vac(otherwise some dust still gets inside the shop vac), the force from the planer fan is so powerful that I don't even need to turn the vac on.

[Jim Dwight]

I use my shop vac with a dust deputy for everything right now. I don't have a connection for anything on my AP-10 planner so I just sweep up after it and then vacuum. I have a port on my jointer but it's 4 inch and my 1hp DC couldn't keep up so I'm sure the shop vac won't. I think I'll have to take the port off and sweep up.

But with the dust deputy, I have yet to need to empty the shop vac and only occasionally clean the HEPA filter. Even drywall dust is mostly captured by the cyclone. I makes a huge difference. If I do a DC, it will also get a cyclone. Life is too short to be cleaning a filter in a DC all the time.

[Mike Henderson]

As Mike found out, a DC won't pull enough air through a small port because it is designed for low pressure so a shop vac impeller designed for high pressure is what is needed. Are you thinking that you could keep the filter, cut a hole in the side of the shop vac and put a 4" DC hose in it and run it with the vac on or only after it is shut off? Dave

I wasn't thinking that, but some people made comments similar to that (your's was the most direct) and I'm considering that now. If I put a blast gate between the DC pipe and the vac, and keep the blast gate closed when I'm using the vac, I won't lose suction pressure in the vac. Then, once in awhile, with the vac off, I can turn the DC on, open the blast gate and suck the swarf into the DC.

The other reason I like the vac hooked to the Kapex is that I have it connected so that it turns on automatically when I turn the Kapex on. I used to often use my old miter saw without turning the DC on because I was in a hurry and I was just going to make a small cut (at least that's what I told myself).

I'll cut a hole in the bottom of the vac and make a connection to my DC. I'll let you know how it works out.

Mike

[I appreciate the suggestions for putting a "Dust Deputy" type device between the saw and the vac but I really don't have the room.]

[Rick Potter]

Mike,

That may remove the contents of the vac, but I suspect the filter will still clog quickly.

[Andrew Pitonyak]

He isn't discussing the DW735. It's a Festool Kapex saw.

hang on, I need to go bang my head against the wall a bit. Not sure how I missed that.

[Al Launier]

Rather than try an alternative to your dust collector you might want to consider using the dust collector with this in mind. I use the Dust Right hose/accessory system & for my miter saw I use http://www.rockler.com/tabletop-dust-fitting for which I attached to a made a box that encloses the rear of the MS. Works well!

[Duane Meadows]

I agree with those who are saying that the shop vac motor is not designed for unfiltered dust. It's not the same design as a dust collector, where there's a TEFC (totally enclosed, fan-cooled) motor and the dust never touches any part of the motor. It pulls ambient air through a fan to cool the motor. Shop vacs get their cooling air from the dirty air that it is sucking up. That's why the filter is upstream from the motor.

Have a look at this. Shop vacs typically use a "flow-through" motor. It's important to filter the air before it touches the fan and motor assembly.

http://www.westernwholesalevacuums.c...rs-guide2.html

The central vacuum system's equivalent of the dust collector design is the tangential bypass motor, which could be configured just like a scaled down version of a central dust collection system (dirty air goes through the fan/impeller, and is blown into a filter).

Also, I'm not sure whether your central dust collector would over-drive your shop vac, or whether it would have the opposite effect. I'm not sure I really follow the logic- it seems you're saying that you want the high static pressure of teh shop vac, but don't want the dust to accumulate in the shop vac bin. Honestly, I would just live with emptying your shop vac.

No, the dirt does NOT go thru the motor! it does, however go thru the impeller and housing! Not a good thing, as the impeller, nor the housing is designed for that. Any large chunks(like bigger than a 1/4") will likely destroy one or both. The dust deputy type pre-filter is a better idea , but leave the filter in the shop vac also.

You will notice in the pictur you linked to, that there is a fan on the top of the motor... that is what cools the motor, not dirty air. You may get a very small amount of very fine dust thru/around the seal, but it will be minimal. Else the motor will not last long! I have changed hundreds of motors and impellers in shop vacs during my career.

[Bill Sutherland]

My Kapex is hooked to Dust Deputy and shop vac and it's perfect for me

[Michael Dye]

OK, I'll bite. What is "swarf"? Obviously an acronym for something, but I am at a loss.

[Prashun Patel]

Swarf?

It's probably more onomotopoeia (doh, SNAP!) then than F.L.A. (five-letter acronym)

[Duane Meadows]

According to Merriam-Webster... "Definition of swarf. : material (as metallic particles and abrasive fragments) removed by a cutting or grinding tool." Hmm, wonder why they left woodworking out of that definition? This day and age we should probably be offended by that!

[Mike Henderson]

OK, Woodcraft had a sale on the Dust Deputy cyclone and I decided to give it a try. I had an unused 5 gallon pail with a top which I mated to the Dust Deputy. I hated to give up the work/storage space but this seemed like the best solution.
Dust-Deputy-01.jpg Dust-Deputy-02.jpg

I have to say, the Dust Deputy WORKS. I was amazed at how well it bypases the swarf into the bucket. I'm sure a bit gets to the vacuum but I won't have to clean the vacuum out very often.

Thanks to everyone who recommended this approach. It works well.

Mike

[One thing I couldn't find was a short vac hose. That's why you see the hose all curled up by the vac.]