Re: [CAD_CAM_EDM_DRO] weird motor problem on my cnc mill

Hi Rick

Do your servo amps take an analog command signal such as 0-10V? Maybe with
tach feedback? Seems like I have had a similar problem when the gain and
offset pots on the servo amp were not adjusted properly. I used a precision
voltage reference box hooked to the command input on the servo amp to adjust
and balance the amps.

Bob

----- Original Message -----
From: "skykotech" <rick@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, July 09, 2005 10:11 AM
Subject: [CAD_CAM_EDM_DRO] weird motor problem on my cnc mill


> I am experiencing a strange problem on my x axis motor on my cnc
> mill. The motor is a Fanuc 0, 56V DC brush, 4 pole. One direction
> the motor runs smooth, the other direction it growls and shudders.
> I took out each of the four brushes and they look perfect. Peering
> at the commutators, they look perfect too. The bearings *feel* ok
> when you turn the shaft of the motor either direction by hand. I
> ran the motor off of a 1 volt supply and it spins in both directions
> without stalling.
>
> On the mill, running it with a gecko g340 drive, the direction
> changes from cw to ccw are harsh (but strangly smooth from ccw to
> cw). At certain speeds in the ccw direction, there is a shuddering
> of the motor, but not in the cw direction.
>
> Any ideas what could be the culprit? If you can even find a used
> Fanuc 0 motor on ebay, they run $200 to $500 in unknown condition...
>
> Thanks for any help
>
> Rick
>
>
>
>
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