My dust system is driving me nuts!

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Forum topic by newwoodbutcher posted 03-26-2012 09:34 PM 2329 views 1 time favorited 10 replies Add to Favorites Watch
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777 posts in 3052 days

03-26-2012 09:34 PM

I running a Delta 50-760 1 ½ H.P. DC. I ran 4” black sewer pipe to my table saw and used a JDS automatic blast gate since the DC was in the other garage. I screwed and taped all the joints and used 45 degree turns with a short spacer to ease the turns. The table saw run is about 24 feet long with 9, 48 degree turns. All was well. Then, I added my 8” Delta Jointer and 15” Delta planner to the system with two more JDS blast gates. I attached a Y connector directly to the input of the DC. The table saw run comes off of one leg of the Y and the jointer and planner come off the other leg. The jointer and planner share a run for about 5 feet then split into another Y, one for the jointer the other for the planner. The jointer run is about 3 feet long ( after the Y) with two 45 degree bends and a short piece between the 45s. The planner run goes about another 8 feet with three 45s directly to a smooth sided flex line. The suction on the table saw run works fine but there is hardly any suction for the jointer or planner. I’ve checked and rechecked all the joints for leaks and blockages. The only little bit of leak I can detect is through the JDS blast gate on the table saw run when opening the gates on the jointer or planner. It’s very very slight. So, my question is: What’s going on? Can you put the JDS blast gates in backwards to cause these leaks? It’s hard for me to imagine the very very small leaks at the blast gate are the problem but I have no clue what else to look for. BTW now that I’m trouble shooting this problem I’m revaluating the JDS blast gates. The almost look like they were designed to leak. Any advice or input you all ay have will be appreciated. I’m pulling my hair out and don’t have much of that to lose. I’m attaching pictures of my set up. I apologize for the orientation but can’t figure out how to rotate them for you.

-- Ken

10 replies so far

View AandCstyle's profile


3179 posts in 2458 days

#1 posted 03-26-2012 11:34 PM

I am no expert, but I think that the diameter is too small for the length and the additional bends. IIRC Bill Pentz’s site has info that you can use to determine the CFM loss due to diameter and corners.

-- Art

View Fred Hargis's profile

Fred Hargis

5176 posts in 2695 days

#2 posted 03-27-2012 11:33 AM

That’s not a very efficient set up, but can you try some things before blaming the blast gates? Completely block the table saw leg near the collector (as in disconnect and cap) and then try the jointer or planer and see if it does what you want. If it does, you are losing too much air movement to the TS leg (leaks or such). If it doesn’t, then you may have blockage in the J/P leg, or you just don’t have enough of a DC, or the duct work is the culprit (a good bet). There could be several other things as well, but you need to start somewhere and this seems as good a place as any.

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

View newwoodbutcher's profile


777 posts in 3052 days

#3 posted 03-27-2012 03:27 PM

Thanks Art, I’m thinking the size of the pipe is OK since the table saw leg which is longer and has the same number of 45s works fine, even now.

-- Ken

View newwoodbutcher's profile


777 posts in 3052 days

#4 posted 03-27-2012 03:32 PM

Thanks Fred,
That sounds like a solid and logical approach. I’ll check it out. To Art’s point, does anyone know the math for calculating the appropriateness of my pipe sizes, turns and run? If so, I could use some help, I’m a dimwit when it comes to that stuff.

-- Ken

View Grandpa's profile


3261 posts in 2877 days

#5 posted 03-27-2012 03:42 PM

Try this link. I think you can calculate your needs here.

View Gregn's profile


1642 posts in 3185 days

#6 posted 03-27-2012 03:55 PM

Just my guess. I think your wye at the collector is your problem. Your drawing air from 2 sources at the same time instead from one source.
Bills site should help as Art mentioned.

-- I don't make mistakes, I have great learning lessons, Greg

View Tomj's profile


204 posts in 2583 days

#7 posted 03-28-2012 03:42 AM

The Delta 50 760 (I have one not piped up yet but these are the numbers I came across on another site in regards to this dust collector) according to these numbers The 50 760 can handle about 5” of static pressure/resistance -6”-45= .27” S.P (static pressure) 4” 45=.21”sp, 6” 90=.54”sp, 4”90=.42”sp, 6” strait pipe (non flex) =.045”sp per foot, 4” strait pipe=.07” sp per foot, 6” flex pipe = .135”sp per foot and 4” flex pipe=.21 per foot. Just look at your system and add everything up and see where your at. These are test results based on tests done with a bunch of Dust collectors from some magazine ( sorry I don’t remember) They were posted from someone else on another site. I’m not saying to trust them (I don’t doubt them) it’s what I am using to set up my system so it’s up to you what you want to do. If I can find the thread I got these numbers from I’ll post the link. Good luck.

View Tomj's profile


204 posts in 2583 days

#8 posted 03-28-2012 08:14 AM

Meaning add what fittings and pipe you have in your system up based on the numbers above and see if your above or below 5” static pressure, oh and the wye’s that come off your main line for example a 6” by 6” by 4” would count as a 4” 45. Again good luck.

View canadianchips's profile


2613 posts in 3198 days

#9 posted 03-28-2012 11:59 AM

Part of your problem is the “Y” connector right at the cyclone. Try to have as much straight pipe as possible going into the cyclone. You are creating a turbulence right at the start. Air efficiency travels in circular motion. (Look at a tornado)
The second thing I would do is run main pipe to Jointer or planer, these machines have larger particles which requires more air to move them.
Not sure of the layout of our shop ?

-- "My mission in life - make everyone smile !"

View newwoodbutcher's profile


777 posts in 3052 days

#10 posted 04-10-2012 04:58 PM

Turns out the Y on the top of the DC had two reinforcing strips across the inside of the Y that were blocked with chips from the jointer. The table saw leg was ok as the saw dust from the TS went through them without clogging. Not sure what those strips were for but I cut them out and all is well. Thank you all again for your generosity and wisdom.

-- Ken

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