Re: [CAD_CAM_EDM_DRO] EMI Rehab (Caps over brushes?)

Thanks Tom!

I'm still wondering what to do about placing caps over the sherline's DC
spindle-motor brushes.
Do I just wire a cap over the two power wires, or connect caps to the
brushes themselves?

Thanks!
Abby

>Hello Abby,
>
>
>
>>.Grounding.. foot bones goes the uh.. leg bone, leg bones goes to the..
>>uh uh oh! Okay, so the chassis will be grounded, the EMI filter ground
>>is common to the chassis ground (well, it's connected actually) but what
>>about the parallel port cable? Do I ground the outer shell of that to
>>the chassis, or leave it off? Wouldn't grounding this cause the cable to
>>be grounded at both ends (PC and controller chasis) and therefore cancel
>>out the effect?
>>
>>
>
>Cable shields should be tied to chassis ground at one end only. That
>chassis should be tied to ground via the third wire on your power
>connector, as it would be with the EMI filtered power entry module that
>you are using.
>
>Chassis ground should NOT be the same as signal ground or return,
>although it often is. For example, cars and boats usually use the
>chassis as signal return.
>
>Various cables sometimes use the shield as signal return or ground.
>Avoid cables that do this. An ohmmeter will tell you if the shield is
>connected to any pins. If so, those pins should not be used for signals.
>The pins might just be connected to the shield for diagnostics.
>
>Tom Hubin
>thubin@...
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