DeWalt table saw connected to Shop Vac output

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WanaGo

149 posts

Master Geek

#301925 16-Oct-2022 09:57

Hello,

I am just starting out to set up my workshop to do some wood working.

I have a brand new DeWalt DWE7491 table saw (2000W model), and I want to connect it to a Shop Vac to start with for dust collection. There are a number on the market that have Power Takeoff, and are designed for connecting power tools so the Vac starts when you turn the tool on, etc.

However the ones I have seen only have like 1000W - 1200W PTO output capability, and my saw is 2000W.

I do not know if the saw actually pulls 2000W, or if this is the peek, or if that is what the motor is rated for but the actual draw is much less. I have seen others use the shop vacs I am looking at, but on first looks the numbers dont add up.

One vac for example is: Karcher 30L WD6 Premium Wet And Dry Vacuum Cleaner (Instructions state 1000W max for connected tool)
Another is: Ozito 1200W 35L Wet And Dry Vacuum (Instructions say 1200W max for connected tool)
Another is: AEG 1500W 30L Wet and Dry Vacuum Cleaner (Instructions state 1000W max for connected tool)
Another is: Full Boar 40L 1200W L-Class Wet / Dry Vacuum With PTO (Instructions state 1200W max for connected tool).

Anyone have any thoughts?
I have seen plenty of people using a range of these to get started with, before they move to full on Shop Dust Collection options.

Thanks

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1069 posts

Uber Geek

#2983302 16-Oct-2022 13:05

Been running the 7491 through the Karcher WD6 for a couple of years without any issue. I don't tend to run the 7491 for long periods at a time - normally maximum a minute to 90 secs, switch off, next item to rip, back on etc.

tweake

2348 posts

Uber Geek

#2983304 16-Oct-2022 13:20

1200w vac + 1200w tool = 2400w total load which is max for 10amp outlet. no doubt why it better to go separate systems so each is on its own power outlet.

richms

28050 posts

Uber Geek

Trusted

Lifetime subscriber

#2983307 16-Oct-2022 13:29

The power outlet on vaccums is made for little sanders and stuff.

I have a smart socket on my vacuum that I use for the vacuum as its thru a wall from where I use it because its a real screamer of a motor, just use alexa to turn it on and off as needed. I guess you could put the saw on a smart socket with load monitoring and then use that to trigger the vacuum, but it takes some time to get the airflow up and the cyclone separator stabilized so if it was to spin up as the the saw was started it would be too slow unless you waited a few seconds before starting the cut.

Richard rich.ms

WanaGo

149 posts

Master Geek

#2983309 16-Oct-2022 13:39

Thanks guys

Yeah in my new workshop I have a range of outlets, 10A, 15A, 32A, so no issue with running everything off one socket in terms of the house burning down or tripping etc.

I guess these vacs are designed for a standard 10A circuit, which is why 2400W etc - yep.

cshwone:

Been running the 7491 through the Karcher WD6 for a couple of years without any issue. I don't tend to run the 7491 for long periods at a time - normally maximum a minute to 90 secs, switch off, next item to rip, back on etc.

Given you have had no problems, I assume the saw is not actually pulling 2000W to either start or cut typical things. I was thinking it is max load, so if you stall the motor out, then it could pull 2000W. I guess that is something I need to test before committing to a system.
But given you have it working on this setup, that is good to know.

I eventually want to get a DeWalt planer, and at that point I will need a dust collector system, rather than a shop vac, as the number of shavings/dust that comes off it, will just overwhelm a shop vac setup. But at $1800 from Mitre10 etc, I am still a little way off getting one of those.

I have not gone down the path of looking for a separate load switch which detects load on one switch, to enable another. I assume they exist. If you know of one that can do this, please let me know. Not keen on doing Alexa type solution, would prefer it all hard wired, or at least local - not via the cloud.

Thanks again

WanaGo

149 posts

Master Geek

#2983360 16-Oct-2022 13:58

I may just end up building one actually.

Using an isolated AC current sense like this, which you just pass the phase wire thought the coil, and it will close the switched output when it detects current load (so put this on the line feeding the saw).
Then have the switch trigger an AC-AC relay, to switch another circuit to turn on the dust collector / vac.
Or feed DC through the switch, and also then put in a timer to have it run for 5-10 seconds after the saw stops, to keep the Vac running etc.
Should work nicely.

Can then use any Vac system or Dust Collector I want, without having to have one specifically with a PTO.

Items such as this
https://www.aliexpress.com/item/1005003844540160.html
or
https://www.aliexpress.com/item/1005004089897872.html

and

https://www.aliexpress.com/item/32907942305.html

Basically what would be inside the Vacs with a PTO, but with the ability to use 2 different sockets if required.

tigercorp

668 posts

Ultimate Geek

#2983373 16-Oct-2022 15:15

To avoid having to get a shop vac with power take off I use these remote controlled mains adapters and highly recommend them. (although technically I have Arlec branded ones that I bought from Bunnings 3 or so years ago but these seem identical)

A single remote can control multiple adapters, I've got the shop vac on one adapter and the dust collector on the other.

What ever you end up doing, it's definitely worth getting some sort of automated or semi-automated dust collection. Because if the dust collection process is too manual/too much grief then you simply won't do it.

If you're going to use a shop vac, I can't stress enough the usefulness of a dust cyclone which reduces the amount of dust and debris clogging up the vac's filter or filling up the vac's bag (if you use one). The cyclone combined with some vac tube combined with a couple of Mitre10 buckets (two because the suction of the vac will destroy a single bucket) works amazingly well.

WanaGo

149 posts

Master Geek

#2983377 16-Oct-2022 16:03

tigercorp:

To avoid having to get a shop vac with power take off I use these remote controlled mains adapters and highly recommend them. (although technically I have Arlec branded ones that I bought from Bunnings 3 or so years ago but these seem identical)

A single remote can control multiple adapters, I've got the shop vac on one adapter and the dust collector on the other.

Thats a pretty neat solution, have not seen these ones before.

Not a bad price for Jaycar either (given their 70% markup)

Mighty Ape

Shop now on Mighty Ape (affiliate link).

k1w1k1d

1486 posts

Uber Geek

#2983449 16-Oct-2022 19:04

I use an Arlec remote control plug for my shop vac.

I would also highly recommend a cyclone to stop the vac bag clogging up.

WanaGo

149 posts

Master Geek

#2983452 16-Oct-2022 19:17

Excellent, thanks

That cyclone looks neat.

So that will get most of the debris/dust into a bucket/barrel, and very little ends up going into the vacuum itself, right?

WanaGo

149 posts

Master Geek

#2983454 16-Oct-2022 19:23

tigercorp:

If you're going to use a shop vac, I can't stress enough the usefulness of a dust cyclone which reduces the amount of dust and debris clogging up the vac's filter or filling up the vac's bag (if you use one). The cyclone combined with some vac tube combined with a couple of Mitre10 buckets (two because the suction of the vac will destroy a single bucket) works amazingly well.

What is the difference between options B and D in the link you sent? Cant find where it states it.

WanaGo

149 posts

Master Geek

#2983455 16-Oct-2022 19:26

Actually the same thing can be found on Trademe, and it works out cheaper than Aliexpress with shipping, and it would be faster to get to - local NZ stock

https://www.trademe.co.nz/a/marketplace/business-farming-industry/industrial/manufacturing-metalwork/dust-collectors-extractors/search?search_string=cyclone%20dust

WanaGo

149 posts

Master Geek

#2983624 17-Oct-2022 09:54

https://www.youtube.com/watch?v=VHgaBxTPEPM

MikeAqua

7769 posts

Uber Geek

#2984184 18-Oct-2022 09:15

I have a decent Karcher Vac (WD-6) but it struggled a little to suck dust etc from my table saw, through a cyclone and into the vac.

I ended up buying a cheap but powerful Tooline steel drum vacuum, which I use with the dust cyclone for my table saw/router table and drop saw. Works really well.

The Karcher I just use for the floor and with smaller tools (sanders, drill etc). I made a reusable bag for the Karcher. This is the disposable fabric bag that came with it. I cut it along the bottom seam, folded it over a couple of times and used a piece of flat timber and some of those black steel bulldog clips to close it. Works well. Every now and then I pull the filter out, take it outside and blast it clean with an air gun.

Mike

WanaGo

149 posts

Master Geek

#2984186 18-Oct-2022 09:22

MikeAqua:

I have a decent Karcher Vac (WD-6) but it struggled a little to suck dust etc from my table saw, through a cyclone and into the vac.

I ended up buying a cheap but powerful Tooline steel drum vacuum, which I use with the dust cyclone for my table saw/router table and drop saw. Works really well.

The Karcher I just use for the floor and with smaller tools (sanders, drill etc). I made a reusable bag for the Karcher. This is the disposable fabric bag that came with it. I cut it along the bottom seam, folded it over a couple of times and used a piece of flat timber and some of those black steel bulldog clips to close it. Works well. Every now and then I pull the filter out, take it outside and blast it clean with an air gun.

Interesting how you found the WD-6 not sucky enough...

The tooline unit you got, was it like the Tooline DC10002 or something?

What cyclone did you end up going with? something like those Aliexpress/TM units? They only seem to have a 50mm port on them, and this Tooline unit has a much bigger hose. High Pressure vs High volume, I assume...

Any more detail on your setup I would love to hear about. Thanks

richms

28050 posts

Uber Geek

Trusted

Lifetime subscriber

#2984213 18-Oct-2022 11:10

WanaGo:

Interesting how you found the WD-6 not sucky enough...

The tooline unit you got, was it like the Tooline DC10002 or something?

What cyclone did you end up going with? something like those Aliexpress/TM units? They only seem to have a 50mm port on them, and this Tooline unit has a much bigger hose. High Pressure vs High volume, I assume...

Any more detail on your setup I would love to hear about. Thanks

There is a larger aliexpress cyclone, but my order was cancelled twice so I am assuming that they couldnt ship it at the time. Might be worth trying again I guess.

I have my rusty bucket ryobi shopvac style vacuum going thru the 50mm aliexpress cyclone and its enough to pull in from my dropsaw and sanders, but when I tried blocking up the bottom of the table saw, it didnt have enough pull to stop most of it just sitting in the bottom of the saw and there wasnt enough thru the blade slot, I guess the holes for all the adjustments let too much other air in.

Richard rich.ms

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