Electric Spark between planer and dust collector - Woodworking Talk - Woodworkers Forum
 
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post #1 of 10 Old 01-14-2013, 10:01 PM Thread Starter
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Electric Spark between planer and dust collector

I have a dewalt 734 planer and a harbor freight dust collector. I put a 4" dryer vent hose between them. I noticed that I was getting small sparks from the planer to the wire inside the hose where it was close to the unit or the base. I have both units plugged into the same circuit, but can't figure out what is going on. The sparks only happen when it starts to plane the wood. While running and not planing I don't have this happening. Any suggestions?
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post #2 of 10 Old 01-14-2013, 10:09 PM
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Sounds like good old static electricity causing the problem.

Some folk recommend all metal duct to prevent such issues since all metal duct will conduct the static to ground without sparking.

If you are using duct which is non-conductive, such as sewer pipe, or the dryer vent hose which is likely steel wire inside plastic, this does not conduct.

When the planer is not generating dust, then no static in the duct.

It is likely the planer dust has static, and this is carrying over to the plastic duct, which insulates until the spark ignites.

This is not easy to solve without changing to all metal duct.

You can try running a grounding wire, bare copper, along the inside of the duct to the dust collector, and grounding at the dust collector.

Wrapping the outside of the plastic duct with a ground wire will not solve the problem.
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post #3 of 10 Old 01-14-2013, 10:19 PM
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I had that problem when I was using a metal dryer hose to a garbage can with my planer. Ended up just running a grounding wire to the base of the planer from the hose and it solved the problem. The chips flying through the hoses are what's causing your static.
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post #4 of 10 Old 01-14-2013, 10:36 PM
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static sparks are common

The solution is easy. You have a planer, a hose, a plenem, an upper bag, a lower bag, and a motor/blower unit on a metal base. They are not connected "electrically" so the static builds up when the dust travel along either hose. I had the same problem UNTIL I "grounded" the plenum to the motor/blower with a copper wire. You can also ground the planer to the plenum after it's "grounded" to the blower. You need to electrically ground all the components of the system to avoid the static. The hoses do not electrically connect or ground the components since there is no metallic connection within the hose....it's all plastic or in the case of the dryer hose some metal depending.

You can just barely see the wire in this photo by the door hinge:

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 01-14-2013 at 10:39 PM.
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post #5 of 10 Old 01-14-2013, 10:43 PM
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Perfect solution.
I noticed the date on a piece of tape on your dust collector. Is that to remind you to empty it periodically?
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post #6 of 10 Old 01-14-2013, 10:44 PM
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yep

It's dated on the last cleaning.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #7 of 10 Old 02-16-2013, 12:27 PM Thread Starter
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That fixed it. I was in the local Grizzly store and they had a kit to do just that. Ran the wire inside the duct and grounded it to each unit. Thx for the info.
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post #8 of 10 Old 02-16-2013, 05:24 PM
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That wire will likely create an issue with buildup in the ducting. Make sure you check it periodically to make sure it stays clear.
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post #9 of 10 Old 02-16-2013, 06:02 PM Thread Starter
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Great tip....will do.

thx
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post #10 of 10 Old 03-05-2013, 07:36 PM
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I want to thank everyone about this thread. I ran a small copper wire (no insulation) from my DeWalt DW734 Planer in a small hole (that I drilled) to the inside of the plastic hose, down the hose to the inside of my shop vac. I then connected the wire to a metal screw that held the motor in place. I hooked every thing back up and turned both units on and started planning again. Only this time without that pesky Static Electricity.
WOW! WHAT A RELIEF IT IS!
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