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Tool Talk Discussion Forum

Dust collector

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CH (upstate NY)

10-17-2007 17:40:13




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I'm just finishing up my new woodworking shop, 30x48'. I'm going to reinstall my Delta dust collection system and this time ground the tubes. I'm using 4" pvc. Do I tape the ground wire on the outside? I would think if you put it inside you'd spend most of your time cleaning clogs.




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Pooh Bear

10-19-2007 18:28:24




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 Re: Dust collector in reply to Blue3992(N Illinois), 10-17-2007 17:40:13  

maplehillfrm said: (quoted from post at 23:30:29 10/17/07) why are we grounding plastic pipes????,, just a question.


Metal pipes are more likely to have a path to ground somewhere in the system.

Plastic pipes won't conduct electricity but they will store a static charge.

Take a plastic comb and rub it on wool then use it to attract small bits of paper.

A plastic comb and some wool will create a small static charge.

Moving sawdust thru a PVC pipe for an hour will create a large static charge.

If you get zapped it is like touching a spark plug on a lawnmower.

And fine sawdust is explosive. All you need is that spark.

That is why you ground the plastic pipes. And metal pipes too.

Pooh Bear

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maplehillfrm,pat

10-20-2007 07:37:53




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 Re: Dust collector in reply to Pooh Bear, 10-19-2007 18:28:24  
thank you, I kind of thought that the day after I asked the question, I appreciate it, pat



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wyod

10-19-2007 09:52:46




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 Re: Dust collector in reply to CH (upstate NY), 10-17-2007 17:40:13  
Hey CH, According to the experts, the BEST way to ground is to run the wire inside the piping... some say that wrapping the wire around the outside of the pipe will work as well. The bottom line is that you need a continuous ground from the dust collector to each machine that is connected to the system. I built my system with galvi pipe... used a short section of flex hose to run from the end of the pipe to each machine. I stripped a bit of the "spring steel wire" from the flex hose and used self tapping screws to attach the wire to the end of the steel pipe on one end, and to some metal part of each machine on the other end. Be sure to use some sort of a "jumper wire" around blast gates or any other interruption in the system. HTH
D

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ray_woods

10-19-2007 09:27:18




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 Re: Dust collector in reply to CH (upstate NY), 10-17-2007 17:40:13  
Thats a big shop. I'd start with out it if you're working solo low volume. I run a couple of 2400cfm chip extractors through PVC. The machines are grounded. Talking to the local experts this is what was decided would work. The wire inside will catch something eventually. Next time around I'm going 6" diameter.



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Rob in Ore

10-18-2007 07:58:23




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 Re: Dust collector in reply to CH (upstate NY), 10-17-2007 17:40:13  
Inside. I've never had any clogging related to the wire. Use lots of blast gates to "disconnect" machines that aren't in use.



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Dusty MI

10-18-2007 06:16:38




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 Re: Dust collector in reply to CH (upstate NY), 10-17-2007 17:40:13  
I've been told that a bare copper wire is put inside the pipe. #12 I think.

Dusty



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Arkandan

10-18-2007 03:49:27




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 Re: Dust collector in reply to CH (upstate NY), 10-17-2007 17:40:13  
I"m curious too. Does that thing build up a static charge that needs to be drained off, thus the ground? If so, I'd surely think the outside of the pipe would be the place to tie it in.



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maplehillfrm

10-17-2007 21:30:29




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 Re: Dust collector in reply to CH (upstate NY), 10-17-2007 17:40:13  
why are we grounding plastic pipes????,, just a question.



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Dale in WV

10-18-2007 10:14:12




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 Re: Dust collector in reply to maplehillfrm, 10-17-2007 21:30:29  
it was my understanding it was static electricity caused by the movement of particles....



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