Doug i think you are referring to self powered my new build is externally excited so both rollers are metal and bottom roller must be grounded.
i did wonder if my bearings would provide electrical ground have not tested yet. Going to test with some bent split washers against a static washer sprayed with graphite.
Sent from my HTC
----- Reply message -----
From: "twoten" <twoten@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: [TCML] Grounding a rotation conductor
Date: Wed, Sep 16, 2015 10:37 AM
When I built a very large vdg for a science center I made sure the lower roller was grounded. The roller was set screwed onto a shaft that was supported on pillow block bearings which were grounded. Easy and effective.
Doug <doug11642@xxxxxxxxxxx> wrote:
>The bottom rollers "BRUSH" "ONLY" needs to be connected to the discharge
>wand! No other ground needed!
>
>On 9/15/2015 10:09 PM, Matthew Sweeney wrote:
>> I need to do so my lower roller, besides an actual brush setuo on oversize
>> washers ive found a part that uses liquid metal to do the job. Pricey tho.
>>
>> Any other ideas, maybe a couple spring washers fastened to ground with
>> enough tolerance to spin against the shaft washers (alternate to actual
>> brushes).
>>
>> Any ideas greatly appreciated :)
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