static shock on domino 500

[hemlock]

I regularly get static shocks on my hand holding the domino body next to the dust hose.  [eek]

Its a festool anti-static hose hooked to a dust deputy that is hooked to a CT26.  Only tool this happens on that I notice....

Anyone else experiencing this with the domino?

I have the dust deputy grounded with a wire as they suggest and I don't notice a static problem on anything else.

I love the domino but not the shocks! 

 

[Administrator_JSVN]

Try it without the Dust Deputy and see if you still get shocked.

I just had another customer using a Dust Deputy experience the same problem but with another tool.

I'm not confident that the "grounding tape" is a well engineered solution.

If no shocks without the Dust Deputy, I'd contact Oneida for assistance.

 

[hemlock]

Now there's an idea  [big grin].  Will test tomorrow and report back....

 

[Rick Christopherson]

I'm not confident that the "grounding tape" is a well engineered solution.

I got a chuckle out of this understatement when I found this picture in the Dust Deputy owner's manual.  [big grin]

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On a high volume system, a washer laying on the floor is not going to be sufficient to fully dissipate charge for the cyclone and all of the hoses connected to it. Each of these components (regardless how conductive they are) will add to the charge build-up for the whole system. Even metal ducting will generate static charge, but we don't notice it as much because it remains homogenous for the whole surface, and any discharge point will discharge the whole system.

The washer on the floor will discharge some static, but if the rate of build-up of static is faster than the rate of discharge, then excessive static will continue to build up in the system. Within the surface area of a washer, concrete is an insulator. It takes a very large surface area (foundation of a building) for it to be considered a good grounding conductor.

It's all about surface area, and that includes the Dust Deputy itself. Grounding a single bolt may not provide a low enough resistance path to dissipate the total charge. The plastic may be classified as conductive, but that doesn't mean it is as conductive as metal. The grounding connection to the plastic needs to cover a relatively large surface area to have a low resistance.

 

[RONWEN]

The washer that Oneida suggests is pretty questionable at best -- what happens when using it on wooden floors or if the washer happens to be laying on sawdust?

I'd be more inclined to make up a special single conductor "extension cord" for the DD where the wire is attached to the GROUNDING PRONG at the plug end, no other conductors involved.

 

[peter halle]

The washer that Oneida suggests is pretty questionable at best -- what happens when using it on wooden floors or if the washer happens to be laying on sawdust?

I'd be more inclined to make up a special single conductor "extension cord" for the DD where the wire is attached to the GROUNDING PRONG at the plug end, no other conductors involved.

I hadn't thought about that Ron.  If there would be someone out there who would like to try Ron's suggestion but is not comfortable with making their own, you can get grounding probes like this:

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at most aquarium supply stores.  The hot and neutral prongs on the plug are non conductive plastic.  You could cut off the probe end and loop it around a screw attached to the copper tape.

Peter

 

[semenza]

In my set up I have some PVC pipe between the Festool AS hose and the CT. I just ran a jumper wire from the hose fittings where it attaches to the pipe , to the CT hose port. It has worked with all tools and volume. I even tested with  and without the wire. Wire no shocks, no wire shocks. So I know that it is actually working.

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I don't have a picture of the other end handy but you get the idea. The other end is secured to the inside of a hose coupler so that whatever hose is connected has a few inches of the wire pressed against it.

Seth

 

[leakyroof]

Hmm. I too own an Oneida UDD, but never get shocks/ static issues. How dry or low in humidity is your work area?
Maybe I'm lucky since I only use my Domino in my basement shop where the humidity is always higher than the rest of my house.
I installed the copper tape supplied by Oneida, but it's nowhere as thorough of a job as others have done to their Dust Deputy Units. See Corwin for a tape done , um, completely on his UDD.  [wink]

 

[RONWEN]

Hmm. I too own an Oneida UDD, but never get shocks/ static issues. How dry or low in humidity is your work area?
Maybe I'm lucky since I only use my Domino in my basement shop where the humidity is always higher than the rest of my house.
I installed the copper tape supplied by Oneida, but it's nowhere as thorough of a job as others have done to their Dust Deputy Units. See Corwin for a tape done , um, completely on his UDD.  [wink]

I've never had an issue in my part of the country either, the humidity runs on the high side.  I haven't done anything at all to ground my DD which is mounted on top of the vac.  I remember Corwin's tape job using all of the available copper tape in the NW.  [smile]

[attachthumb=#]

 

[Corwin]

... I remember Corwin's tape job using all of the available copper tape in the NW.   [smile]

Yeah, and we've been surrounded by slugs around here ever since.  [eek]

 

[thebicyclecafe]

I grounded my AS hose/dust deputy by using copper tape at the outlet, making sure it contacts the hose; that copper tape is attached to a copper wire that is wired to the grounding tab on my CT vacuum. Definitely a difference with and without, without the grounding connection I got shocked every time I used it.

 

[ceddy]

I also get this with my track saw and the UDD, now I know why!

 

[hemlock]

Thanks for great feedback!  I am in Idaho USA.  Very low humidity, typically.  Since first post i applied foil tape provided with DD to DD from grounding wire bolt to both hose inputs.  Seemed to help but need to do better test to really believe that really did it..  Will do more complete tests this weekend.  Lots of ideas now to try to solve this.  Much appreciated. 

 

[copcarcollector]

I get a shock too with the DD - and now I know why!

RONWEN, any chance for a picture of your vac set up a little further away, and from the other side too? You have 2 hose sizes on the boom arm, correct? Thanks-

 

[hemlock]

I promised some photos a while back.  So here goes.  Foil tape on DD and wire DD recommends.  Still need to do a good Domino test, but this seemed to help.  More later.....

 

[nowandthen]

I have the Midi with the Ultimate Dust Deputy. Have had it for about a year. Never got a shock. Just bought a CT26 and another Ultimate Dust Deputy. I get shocks all the time on the CT26 setup.  I added the metal tape  on the elbows from Oneida but still get shocked. I don't recall the UDD cominig with metal tape when I bought the Midi, and I did nothing special with it. But after multiple shocks off the UDD on the CT26, I installed the metal tape on the elbows, but I still still get shocked. If I push the Oneida hose against the DD before touching the the DD box then I don't get shocked. On the Midi, the hose connection is inside the body of the dust extractor (not a port on the front like the CT26). I can only surmise that the Oneida hose is conductive and on the Midi is making contact with the body of the dust extractor whereas on the CT26 with the hose connection on the front, does not allow the Oneida hose to make contact with the DE body and UDD.

I love the DD but hate getting shocked every time I touch it. I'm beginning to hate the DD. Pavlov?

It's not a humidity issue. My Midi with UDD does not shock me, my CT26 with UDD does shock me! So either the Oneida hose contacting the body of the Midi vs. not contacting the body of the CT26 is the problem or Oneida has changed the composition of the DD cyclone and/or hose.

Big fan of the UDD but not so much lately.

Not buying the washer on the floor fix... but if you buy that, I have a bridge for sale...

 

[hemlock]

Good info.  Thx.

I do wood, not electricity.   Good thing.  Like I said tape and washer seemed to help but need to do some serious dominoing to know for sure.  Interesting ct26 seems to matter.   I worry about pavlov too.    Testament to both DD and domino that I still use both  [big grin].   DD will go if I have to choose.  Duh....

About that bridge....

 

[nowandthen]

I cured the static shock problem on my CT26 with Ultimate Dust Deputy.

I took a piece of metal tape, the kind used for HVAC ducts, ran it from the hose input port on the DD (the port where the tool hose connects) ran it down the side of the DD to one of the six screws at the base of the DD. Took out a screw, punched a hole through the tape, placed a washer over the tape and reinstalled the screw. No more shocks!

 

[Wim]

I made a wooden sort of cyclone. On top were two PVC-bends were the anti-static hoses went. With the TS55 and the Domino 500 I sensed a slight form of shocks. So the anti-static hoses served a purpose and were not just a moneymaker. I folded a piece of heavy duty household alu-foil into a strip and put both ends between the hose-ends and the PVC bends when inserting the hoses. Problem solved.

 

[nowandthen]

I only got shocked using Festool tools, TS55 and maybe the OF1400,  I honestly don't recall. When I connected a DeWalt biscuit joiner or Ryobi random orbital sander I never got shocked.  ??? Everything was the same except the tool.