Dewalt DW735 dust collection question

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Forum topic by jtm posted 03-09-2015 05:16 AM 1883 views 0 times favorited 9 replies Add to Favorites Watch
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230 posts in 1598 days

03-09-2015 05:16 AM

Hi all,

I have a question/problem with my DW735 dust collection. I’ve researched this quite a bit, but I wanted to toss this out there for opinions.

Right now, my DW735 is connected to a 4” PVC piped system. The length from the planer to the 2HP Grizzly dust collector is only about 12 feet. If you look at the picture, you’ll see that I only have a foot or so of flex hose between the planer and the PVC, with a metal blast gate in between.

Now, when I plane a board, the chip extractor is so strong on the DW735 that it literally expands the flex hose and forces small dust through the open slit on the blast gate (I have duct tape over it in the picture). I know tons of people have their 735’s hooked up to dust collection, so I’m curious if any of you have this problem.

For the record, I plan on doing two things:

First, the blades are probably due to be changed. I’ve run a decent amount of wood through it, so maybe they are too dull, causing more fine dust than chips.

Second, I plan on replacing the dust collector bag, as it’s definitely getting full. Maybe that will increase suction, as the last time I let it get too full, it literally blew the filter right off.

9 replies so far

View TimberMagic's profile


114 posts in 1141 days

#1 posted 03-09-2015 05:57 AM

I have same planer, but has about 12 feet of flex to my Laguna 2HP DC. I have not plumbed my basement shop yet, I just use Rockler’s DustRight quick ports on my tools, and move the hose around as needed. I have not noticed any issues with expansion of flex hose, but it may be that since I am using a long run of it, it just better absorbs the pressures.

I can relate to the force from the chip extractor. The first time I used the planer, I used the included long, slender “nozzle” that came with the planer. I’ll bet I still have some chips hiding in corners of my shop 5 years later. I’m not really sure of the value of that device!

-- Lee

View Fred Hargis's profile

Fred Hargis

4944 posts in 2455 days

#2 posted 03-09-2015 11:22 AM

You might want to check your filter as well, if it has clogged a little that can really decrease air flow. Personally I wouldn’t rely on that flapper to clean it, or at least verify it does clean it. Use it and then dismount the filter and have a look.

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

View OSU55's profile


1624 posts in 1951 days

#3 posted 03-09-2015 12:14 PM

Have the same planer and use a 10’ 4” flex hose connected to a HF DC. The flex hose jumps quite a bit when the planer is turned on. The blower in the 735 is very strong. Not sure you will completely eliminate leakage around the blast gate. Perhaps there is a better designed blast gate that seals better. One option is to disconnect the 735’s blower motor internally so it doesn’t run and let your DC do it all. If the wires can be pulled off terminals or unplugged, it would be very simple to reverse.

View MikeDilday's profile


10 posts in 421 days

#4 posted 02-22-2017 04:36 AM

Have you checked your DC pipe? Maybe there is a partial obstruction?

-- Michael Dilday, Suffolk, Va.

View TungOil's profile


901 posts in 457 days

#5 posted 02-22-2017 05:02 AM

I have the same planer and contacted dewalt about the same issue. They advised me to NOT hook this unit up to a dust extractor. If your dust collector cannot keep up with the internal blower in the 735 you will have the issue you are seeing. If your extractor can pull more CFM than the planer can put out you run the risk of overspeeding the internal blower and damaging the machine.

I eventually settled on the Rockler kit that turns a trash can into a cyclone and added an old DC bag to the discharge. This way the 735 does all the work. Works fine.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View pintodeluxe's profile


5616 posts in 2775 days

#6 posted 02-22-2017 05:07 AM

When I ran my 735 with a single stage collector, it would start to fling chips around when the bag was more than 2/3rds full.

I have since upgraded to a hard piped cyclone and collection on the 735 is excellent.

Metal gates shouldn’t leak chips though. I have several brands of metal gates, and even automatic gates, and none leak dust.

I experimented with removing the fan on the 735. You can unbolt it (it’s powered by the main planer motor). I wanted to see if it would help with the noise. It didn’t make any difference so I put it back on. So I switched to a shelix head which helped quite a bit.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View coxhaus's profile


90 posts in 856 days

#7 posted 02-22-2017 05:46 AM

Looks like you have an extra 4 inch port on the dust collector you could connect the planer directly to. I might try that rather than going up and over.

View clin's profile


825 posts in 958 days

#8 posted 02-22-2017 04:40 PM

I connect my 735 directly to a large filter bag. Works great. As you’re seeing, if the DC can’t keep up with the 735 blower, the DC actually inhibits air flow. As TungOil pointed out, if the DC is too strong you run the risk of damaging the 735 blower. Though I’ve not seen anyone claim that has happened to them.

-- Clin

View Jim Finn's profile

Jim Finn

2647 posts in 2884 days

#9 posted 02-23-2017 01:46 AM

I have this same planer and have four feet of 4” flex connected to it and to my six in dust collector duct. No problems. I have a 2 HP Grizzly dust collector.

-- Website is

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