Static Shock - Cordless table saw CSC SYS 50

[aWanderer]

I recently purchased this table saw and I love it.  Yesterday was the first time I have been able to actually use it. I was resewing a bunch of 2x4 peices and the static shock from it was BAD. So bad that I had to stop after 4 3 foot lengths of 2x4.

How am I using it you ask, well... I have a CT-15 dust collector hooked up to an Oneida Dust Deputy. From the Oneida Dust Deputy I am hooked up to the saw. The CT-15 did not come with an anti-static hose but I am not sure that is where the problem is... maybe it is the hose from the Oneida Dust Deputy to the saw. Maybe it is the weather.. IDK.

Today I will try it with the dust bag that came with the saw and see if it is still a shocking experience. Anyone else using this saw with a cyclone-type separator? Any thoughts here are greatly appreciated.

View attachment 1

 

[semenza]

Hi,

    Are you getting the shock from the hoses?   

    You need to maintain the grounding connection from the saw to the CT vac hose port. So the AS hose does matter as well as the DD and DD hose.  Try attaching a copper wire from the saw port to the vac port. Doesn't need to be any special wire just to try it out. A piece of 16ga  or the like will work. Strip some of each end, fan out the strands, and just press it into the hose port along with the hose connector.

      I've had mine set up like this to complete the connection on my set up for many years.

    [attachimg=1]

  Seth

 

[aWanderer]

The shock is coming from the saw, mainly the stand that the saw is sitting on. I can see the static on the control screen of the saw as well.. dust just clings to it until you can't read the display anymore.  I will try the wire trick as well.

 

[semenza]

The shock is coming from the saw, mainly the stand that the saw is sitting on. I can see the static on the control screen of the saw as well.. dust just clings to it until you can't read the display anymore.  I will try the wire trick as well.

I think it might still be the result of the connection being broken. 

Seth

 

[aWanderer]

I agree with you. What if I did this?  red line being the wire. Only wired to the ground of the plug. Would my intake port on the CT15 still work? The port is not really easily accessible I don't think like yours in the pic.

View attachment 1

 

[Cheese]

At each red arrow, is a hose connection interface that needs to maintain a good ground contact. If any of those connections are "electrically broken", your ground path is broken.

Also, check the electrical outlets where the saw and the vac are plugged into to make sure they are grounded back to the main panel.

I'd also install the newer anti-static hose that comes with the current CT 15. 

Several years ago, there were some discussions on the FOG about the Dust Deputy not maintaining a good ground path. I believe one of Oneida's solutions was to manufacture a cyclone from carbon loaded materials. There was also some talk of Oneida offering a conductive metal tape with specific instructions on how to apply it.

What started the discussion was some folks were complaining about zapped circuit boards on their CT vacs.
https://www.oneida-air.com/question/how-should-the-dust-deputy-be-grounded-/?_gl=1*1rztpga*_up*MQ..&gclid=EAIaIQobChMIkY-Uqa_9iwMV3zStBh2j9gwHEAAYASAAEgKjnPD_BwE&gbraid=0AAAAADzmatoFo4j96o9BoqfSXo4PWubAe

[attachimg=1]

 

[Vtshopdog]

Is the Dust Deputy itself grounded in any fashion?

The swirling wood chips in the conical separator are a great source of static.  I'm guessing it's originating there and the potential difference (voltage) is conducting to the saw and stand.

Edit post Cheese's comment:
Quick and dirty test would be running a conductor affixed to the Deputy cone to a viable ground point (electrical outlet third prong, outdoor main panel ground stake, copper water pipe, whatever is handy).  If that helps you could install something more permanent.

 

[waho6o9]

View attachment 1

I hooked up a ground wire to the trouble spot as mentioned above and it helped a lot. 

YMMV

 

[rmhinden]

Have you tried taking the Dust Deputy out of the system and see if the static problem goes away?  Just use an antistatic hose directly to the CT15.  This would tell you if that is where the static is coming from.  If it remains, then there is an electrical problem.

BTW, I doubt the Dust Deputy is needed for the table saw. 

Bob

 

[Crazyraceguy]

I would do as [member=66813]rmhinden[/member] says, eliminate the Dust Deputy from the mix. It is likely the break in the ground path.

 

[aWanderer]

Hi,

    Are you getting the shock from the hoses?   

    You need to maintain the grounding connection from the saw to the CT vac hose port. So the AS hose does matter as well as the DD and DD hose.  Try attaching a copper wire from the saw port to the vac port. Doesn't need to be any special wire just to try it out. A piece of 16ga  or the like will work. Strip some of each end, fan out the strands, and just press it into the hose port along with the hose connector.

      I've had mine set up like this to complete the connection on my set up for many years.

    [attachimg=1]

  Seth

This resolved the issue. I went and bought a roll of copper wire and ran it from end to end. Problem solved. Was able to rip 6 2x4's and not a single shock... unless I touched the copper wire

Then my batteries died

thank you!

 

[waho6o9]

Good news, bummer about the batteries.

 

[semenza]

Hi,

    Are you getting the shock from the hoses?   

    You need to maintain the grounding connection from the saw to the CT vac hose port. So the AS hose does matter as well as the DD and DD hose.  Try attaching a copper wire from the saw port to the vac port. Doesn't need to be any special wire just to try it out. A piece of 16ga  or the like will work. Strip some of each end, fan out the strands, and just press it into the hose port along with the hose connector.

      I've had mine set up like this to complete the connection on my set up for many years.

    [attachimg=1]

  Seth

This resolved the issue. I went and bought a roll of copper wire and ran it from end to end. Problem solved. Was able to rip 6 2x4's and not a single shock... unless I touched the copper wire

Then my batteries died

thank you!

Hi,

      You're welcome.  Regardless of the actual point of the problem in between, jumping over the whole set up was most likely to solve the problem.  At some point if you want to get rid of the wire you could try tracking it down. But I think there are several components in the chain that are causing a break in the connection.

  Oh, and welcome to the forum!  [smile]

Seth

 

[mino]

...
The CT-15 did not come with an anti-static hose but I am not sure that is where the problem is...
...

Pretty sure this was a typo, but for those reading a year later:

The black hose attached to the CT is anti-static. The CT 15 did ship initially with non-AS hoses, but those were grey. All the black Festool hoses are AS type. So that is a proper Festool AS hose on the pictures. And it does(would) work if attached directly to the saw port.

The "connection break" would be the Dust Deputy. Lets just say the AS credentials*) of the clear plastic DD kits are not the best .. the OP did the right thing here.

*) I am yet to see transparent plastic that is actually conductive and able to carry a charge through. Not just "reduced risk of discharge" type "anti-static". The properties of the plastic are probably enough to not have charge generated by it accumulate, but not enough to allow a charge to pass-though - like the Festool AS hoses do.

 

[aWanderer]

Thank you ALL for the help and suggestions to resolve the issue.

I did not know that black hose that came with my CT-15 is an anti-static hose - this is good to know.
I did try it without the Dust Deputy (DD) and there were no issues.
I do have the metal tape that came with the DD setup correctly, as per instructions.
I told the wife I need a CT-26 and the CT Cyclone Pre-Separator.

 

[Packard]

Hi,

    Are you getting the shock from the hoses?   

    You need to maintain the grounding connection from the saw to the CT vac hose port. So the AS hose does matter as well as the DD and DD hose.  Try attaching a copper wire from the saw port to the vac port. Doesn't need to be any special wire just to try it out. A piece of 16ga  or the like will work. Strip some of each end, fan out the strands, and just press it into the hose port along with the hose connector.

      I've had mine set up like this to complete the connection on my set up for many years.

    [attachimg=1]

  Seth

This resolved the issue. I went and bought a roll of copper wire and ran it from end to end. Problem solved. Was able to rip 6 2x4's and not a single shock... unless I touched the copper wire

Then my batteries died

thank you!

Hi,

      You're welcome.  Regardless of the actual point of the problem in between, jumping over the whole set up was most likely to solve the problem.  At some point if you want to get rid of the wire you could try tracking it down. But I think there are several components in the chain that are causing a break in the connection.

  Oh, and welcome to the forum!  [smile]

Seth

The 4” diameter hose I ordered from Rockler som 30 years ago came with a length of thin bare copper wire that I was supposed to feed through the hose.

It would seem that an awful lot of posting was done here “just to avoid a bit of static shock”.  Of course that is not the issue.  The airborn sawdust behaves like a volatile gas and if ignited will explode like one too. 

I have not read about any dust collection systems blowing up, but I have heard about some grain silos doing so (they also have a lot of airborn dust).

The DeBruce grain elevator explosion is probably the best known.  I found this article fascinating—and it will give anyone a new-found respect for dust.  (7 dead; 10 injured)
https://dustsafetyscience.com/debruce-grain-dust-explosion/#

The Dust Explosion Pentagon

The Dust Explosion Pentagon illustrates the five elements necessary for a dust explosion:

Fuel: Combustible dust particles.

Oxygen: Present in the air.

Heat Source: An ignition source like a spark, hot surface, or flame.

Dispersion: Dust particles must be suspended in the air.

Confinement: The dust and or dust cloud must be within an enclosed or semi-enclosed space.

 

[bobtskutter]

I have a Numatic industrial vacuum cleaner that has a steel drum which acts as a primary cyclone, and a separate filter drum with bag.  It sits on 4 large rubber wheels and the power head is also insulated from the steel drums.  I've seen blue sparks jump from the drum to the power head if it's got a lot of fine dust inside it.  Opening up the machine you can see where the fine dust has been swirling around and creating the static charge.  I'm pretty confident your plastic cyclone and drum is creating the static charge when the fine dust swirls around inside the bucket.

Bob

 

[aWanderer]

Yep. No doubt about it.