Am I starving my d/c?

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Forum topic by CrazeeTxn posted 04-23-2013 02:13 AM 1009 views 1 time favorited 10 replies Add to Favorites Watch
View CrazeeTxn's profile


151 posts in 2188 days

04-23-2013 02:13 AM

So I have a used Jet 1 1/2hp d/c. I put a Wynn filter on it (smart move on my part ;) ). It has a 6” inlet and right now I have a Y that goes into 4”. I have one hose running to my tablesaw then the other one on what ever tool I’m working with at the time. I only use one hose at a time and I don’t have a blast gate yet so I just swap the hose out and keep the other hole covered.

I notice when I turn it on there’s some action in the clear bag, but if I crack the cap off the other inlet all he!! breaks loose in the bag. By that, I mean I see more action. Should I be keeping the lid cracked or just let it all suck through the one 4”?

10 replies so far

View Fred Hargis's profile

Fred Hargis

5236 posts in 2731 days

#1 posted 04-23-2013 11:36 AM

Are you getting the performance you expect at the machine? I wouldn’t judge what to do by what you see in the bag. If the DC is clearing the dust as you want, then don’t worry about it. That said, a 4” line will only allow somewhere in the neighborhood of 400 CFM…and such a load would be a piece of cake for your DC (in terms of motor load). Opening another port will likely reduce the flow from the machine in use, as well as allow more air (from the second opening) to increase the motor load…so opening the other port doesn’t seem to make sense.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 2186 days

#2 posted 04-23-2013 11:41 AM

Go with 6” pipe it will make a huge difference in flow. I have just started plumbing mine. Right now I am making 6” blAst gates.

View toolie's profile


2148 posts in 2866 days

#3 posted 04-23-2013 12:08 PM

and add a baffle to the drum ring. it slows down the air movement in the lower bag, sends more of the collected debris to the collection bag that usually goes to the filter keeping the filter cleaner longer for better suction. here’s how i modified mine:

and here’s a link to phil then’s site. lots of good info on dust collection:

-- there's a solution to every just have to be willing to find it.

View CrazeeTxn's profile


151 posts in 2188 days

#4 posted 04-23-2013 12:44 PM

Fred – I am getting the performance I believe I want. It’s a huge step up from a DD on a shop vac. I know I’m not going to get it all, but I’ve seen more in the bag from the t/s quicker than I ever did and there is very little left in the saw.

Shawn – Eventually 6” pipe/hose is in order.

Toolie – I’ve seen alot of folks put the baffle or even a wok in the d/c. That’s one of those, evetually I’ll get around to it.

View HorizontalMike's profile


7770 posts in 3151 days

#5 posted 04-23-2013 12:54 PM

It doesn’t have to be purdy or expensive, and it really is a game changer in a positive way. Here it the separator that I built and still use:

-- HorizontalMike -- "Woodpeckers understand..."

View gtbuzz's profile


427 posts in 2679 days

#6 posted 04-23-2013 01:29 PM

Since you don’t want to use more than one machine at once with this DC (I wouldn’t recommend it either), I’d would absolutely pop off that splitter. Run 6” hose to the machines and just use a 6-4 reducer at the connection. You’ll get a LOT more airflow that way.

I had pretty much an identical setup; Jet DC1100 and Wynn Filter. The design of this DC is nice in that it allows you to put a separator inside the ring itself. That’ll help keep the filters from clogging up as fast and it also has the added benefit of not having a static pressure hit like a preseparator. I built one for mine and it worked pretty well (definitely better than no separator) but:

- It didn’t perform as well as a preseparator, IMO. Perhaps I didn’t get the dimensions right. Want to stress again though, that it was MUCH better than no baffle at all
- there’s no added benefit of a preseparator. I sucked in way too many things into the impeller and that prompted me to change to a cyclone-type setup (cleaning up a busted jar of Shellawax was NOT fun!!)

View Lee Barker's profile

Lee Barker

2170 posts in 3088 days

#7 posted 04-23-2013 02:15 PM

I am wondering about load on the motor with the second leg plugged. Does it change pitch significantly between plugged and unplugged?



-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View Fuzzy's profile


298 posts in 4226 days

#8 posted 04-23-2013 04:29 PM

The job of the dust collector (much like a vacuum cleaner) is to move AIR. If the air contains debris, it should move the debris to the central collection point as well. When you plug the inlet on a vac or d.c. ... AND … the motor speeds up … it is NOT because of the load the plug places on the system … it is because the system is not moving any air, so there is no load on it. This is the reason why larger home d.c. systems will pop a breaker if you run them in open air without any ductwork connected to them … they are doing too much work, which overloads the motor, causing the breaker to trip.

If you are using only one tool at a time, and are already moving the hose from one tool to another as needed, you would do well to lose the splitter and utilize the larger diameter hose.

-- - dabbling in sarcasm is foolish … if you’re not proficient at it, you end up looking stupid … ... ...

View MT_Stringer's profile


3183 posts in 3468 days

#9 posted 04-23-2013 04:34 PM

I put my separator upstream of the fan in a 32 gal plastic drum. Everything except for the very fine dust winds up in the drum. There is less than a pint of dust in the bag after two weeks use. The drum has the rest in it.

A plus for this setup is unwanted items such as screws, and other small hard pieces never make it to the impeller.

-- Handcrafted by Mike Henderson - Channelview, Texas

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 2186 days

#10 posted 04-23-2013 04:45 PM

If you go 6” then put 6” ports on your tools. When I first set mine up I had4” flex reduced to 2” after sucking up a bunch of dust I split the hoses and I could hear all kinds of stuff Shute through the pipe

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