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Readout flickers with motor running (glass scales)
#1
I just finished installing 1um glass scales on my 6x12 surface grinder. Unfortunately, there was no good place to install the Z-axis scale, other than right next to the motor. The motor itself is a 3/4hp 3-phase, 220V unit, running off a VFD.

The reading is dead stable with the VFD powered up, but once the motor is up and running, the 4th decimal flickers 1-4 tenths. On a mill or lathe, this wouldn't be a concern... But on the surface grinder, tenths matter.

Is there any way to shield the scale, or otherwise eliminate noise? I've read that the iGaging scales benefit from a 0.01uF cap soldered from VCC to GND... Is there something similar that can be done on the glass scales?

Any help would be greatly appreciated.
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Readout flickers with motor running (glass scales) - by MidniteMachinist - 07-26-2021, 02:44 PM

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