Static in hoses

[derekcohen]

Yesterday, I was cleaning out the dust bin of the Dust Collector. It had overfilled as I was pushing the last of the thickness/planing. The wood was Rock Maple, and shavings are quite fine off the Hammer A3-31. While mopping up the dust in the bin, using a CT26e and antistatic hoses, I could feel a static charge through the hose. It left a tingling in my fingertips. I tried a second hose with similar results.  Later I used the hose elsewhere, and there was no similar experience. This is the first time I have experienced static. The CT26e is about 10 years old.

I put this down to the high flow of the fine Rock Maple chips. Could there be another explanation?

Regards from Perth

Derek

 

[mino]

Assuming the vac was properly grounded (not a given), it can be that the hose/vac was the *only* thing that was grounded in the area at that moment.

I had this confuse me once where me as well as the stock and the worktable got charged up. Was sanding and got a jolt as I grabbed the hose. Then both me and the vac got another one as I touched the table .. which just leads me to remember now .. the source was with a new-ish Bosch 5" sander that had a non-conductive body. It was at a good price .. ahem. It was attached to the Festool AS hose, but that was no good as it just transferred all the charge to me/table/stock.

Point being, it does not have to be the hose/tool that is charged to get a jolt .. unless all things are grounded, including tools, it can happen.

 

[woodferret]

The AS hoses will still allow static to build.  Once the voltage is high enough though (usually when it gap sparks) is when it lets the electrons flow down to ground.  Until then, it's still just an insulating plastic... and your arm hairs will react to it appropriately.

 

[Coen]

The AS hoses will still allow static to build.  Once the voltage is high enough though (usually when it gap sparks) is when it lets the electrons flow down to ground.  Until then, it's still just an insulating plastic... and your arm hairs will react to it appropriately.

It's not an insulating plastic. That the hose might not be perfectly connected at the end (needed a certain voltage to blast through) doesn't make it insulating.