- Joined
- Feb 17, 2021
- Messages
- 468
have the same lathe someone told me might have something to do with pods on the circut board,,,,,,just a suggestion,,,,,,
The pots/ adjustable resistor on the board may have a dead spot.Hello,
I have a good friend who has a brand new VEVOR MX-7x14 lathe. When he turns the speed all the way up he gets 2250 RPM. But if he sets it for 1000 RPM and tries to take a light cut, the machine slows down to almost nothing. A couple of questions, if I may.
1. What type of motor is used in this lathe? Brushed or Brushless? Does the motor operate with any feedback to the controller?
2. How does the controller adjust the speed? Is it voltage, PWM or something else?
I am a retired electrical engineer. I would appreciate any thoughts about this problem.
Thanks!
sorry to say that motor is not b/l if so the lathe would be more expensive , in fact that stock brushed motor imo is garbageExamination of literature for their 7x14 on the Vevor web store shows that the lathe doesn't have a high/low transmission. This suggests that the 500 Watt motor is brushless. My experience with the 500W brushless motor on my mini mill (also sans transmission) has shown that it it has good torque at low RPMs, so it is possible that the controller in your friend's lathe is either defective or is incorrectly adjusted so it can't maintain torque under load.
do you mean speed controller on a BLDC or a VFD on an AC motor?After a small tweek to IR with no noticeable improvement. Started takeing cuts and useing the speed dial to adjust underload for a very underwelming performance untill I let the smoke out of the motor. So here is a picture of the ZYT-338 220V 120W 2500RPM DC motor.View attachment 488673 I'm thinking the best option is a VFD on a BLDC motor.
I was thinking of a VFD on a BLDC. But after some research I ended up going for a "1100w Brushless Servo Motor with Controler" $225AUD after GST. I'm now considering poly v pulleys rather than the existing. (do you mean speed controller on a BLDC or a VFD on an AC motor?