Pillar Drill switching off at full speed

[Hemsby]

Need advice please,

My pillar drill has a single phase 1HP motor that I have just had rewound. The original plate on the motor states 2.8 amps full load.

All works well unless I change the belt for max speed and the switch trips #-o .

It is a MEM start/stop switch which has a sliding adjuster set at 2.8 amps, I assume it is an overload setting :?: not sure if it has accidentally been moved during the machine overhaul.

Is the motor max of 2.8 amps too close to the overload setting of 2.8 amps :?: Should I change it to next setting of 3.1 amps or leave alone and assume there may be a problem with the rewind (unlikely) and call in a man who knows :?:

Thank you

 

[CHJ]

Going up a notch on the trip should not be a problem.

It could just be that during the re-wind the number of turns fitted into the field coils was slightly less * resulting in a small increase of run-time current.

* Nearest modern Wire gauge size, less than perfect winding technique, thicker insulating materials etc.

Just check the motor casing when used for a long period on the high speed and see if it rises above hand temp.

I would also have expected the current trip to go on lower speeds and heavy cuts (large diameter saw tooth bit for instance) though if just the higher gearing of spindle speed causes it.

 

[Hemsby]

Going up a notch on the trip should not be a problem.

It could just be that during the re-wind the number of turns fitted into the field coils was slightly less * resulting in a small increase of run-time current.

* Nearest modern Wire gauge size, less than perfect winding technique, thicker insulating materials etc.

Just check the motor casing when used for a long period on the high speed and see if it rises above hand temp.

I would also have expected the current trip to go on lower speeds and heavy cuts (large diameter saw tooth bit for instance) though if just the higher gearing of spindle speed causes it.

Thanks for the response.

I have not “worked” the drill since the rewind, just ran it through its paces when I found the problem. Did not want to change the trip setting without some advice so left well alone.

I will move the trip to 3.1 amps and try it on full speed if that is successful I will give it a proper cut test through the speed range.

Again thanks.