I have had no end of trouble with the 880Kv motors from jDrones, these past few months, and want to know if anyone else is having similar issues. I would not normally bring up a topic on a particular supplier part but these are one of the recommended motors for the DIY Arudcopter. I have now had 3 separate motor orders and each time I am lucky if I get one good motor. So far I have ordered 10 motors and have 5 unusable with the following problems:
1. One Motor burnt out on first power up after roughly 1 minute of operation. Inspection showed the motor casing had metal burs left over after machining. I fact I have found a few like this.
2. 3 motors are making a louder grinding noise due to premature bearing failure / tolerance issues. I got roughly 2-3 flights out of these motors.
3. One motor out of the last batch (arrived last week) has been tapped twice on the motor shaft which came loose on a third flight damaging my copter. I had noticed on the first test the motor was vibrating more than the others (without props fitted). After the minor crash today I found the motor when manufactured had a cross-threaded grub screw which was not able to hold the center shaft.
I have attached a couple of photos below of the latest motor because having two tapped holes on one side of the shaft leads to imbalance. You might want to check if you have one of these faulty motors.
Perhaps the DIY store needs to look for another supplier of the 880Kv motors? There have been some posts on the 880Kv motor recently. New bearings were mentioned being used in new motor batches.
It would be nice to have more than 2 flights before having to replace motors