RdR24
Plastic
- Joined
- Feb 26, 2021
- Location
- Netherlands
VFR and Digital RPM meter on drill press, "mysterious" behaviour...cannot find answer
Goodday,
I've upgraded my 220V drill press with a VFD and a 3x220V motor. That works great.
Because the transmission ratio's has changed i've ordered a simple digital RPM meter to get an accurate RPM readout.
I've mounted a magnet on top of the rotating main shaft and made a bracket/mount for the sensor.
First there seemed to be no problem. Digital readout was good when manually tested.
But, after assembly on the drill there was no readout as soon as I switched the machine on.
I tested and tested and finally found out that when the sensor touched the metal of the drill the display only showed stripes.
When I held the sensor in my hands though it showed the RPM, one step forward!
So I isolated the holder and thought that would solve the issue.
Unfortunately not. When the sensor is in the holder the RPM readout switches continuously...
I thought of vibrations that maybe could trigger the sensor? So I welded the support for extra rigidity. No luck sofar...
Does any body know a solution?
Thanks
Rob
Goodday,
I've upgraded my 220V drill press with a VFD and a 3x220V motor. That works great.
Because the transmission ratio's has changed i've ordered a simple digital RPM meter to get an accurate RPM readout.
I've mounted a magnet on top of the rotating main shaft and made a bracket/mount for the sensor.
First there seemed to be no problem. Digital readout was good when manually tested.
But, after assembly on the drill there was no readout as soon as I switched the machine on.
I tested and tested and finally found out that when the sensor touched the metal of the drill the display only showed stripes.
When I held the sensor in my hands though it showed the RPM, one step forward!
So I isolated the holder and thought that would solve the issue.
Unfortunately not. When the sensor is in the holder the RPM readout switches continuously...
I thought of vibrations that maybe could trigger the sensor? So I welded the support for extra rigidity. No luck sofar...
Does any body know a solution?
Thanks
Rob