I have a 24v bldc 400w motor, and I’m planning on using it for a lathe. These are usually used with a battery setup, but I’m planning on using a switching power supply. I’ve been reading up on electric scooter motors and it sounds like they draw 1-5 amps with no load. I found a diagram for my motor
On this diagram it shows a 40 amp switch/40 amp fuse. This is over current protection right? I was planning on using a 500w power supply to play it safe, and give myself some headroom. Is this going to draw a lot of amps if I’m turning metal? I wouldn’t think it would need as much power as pulling a 200lb person up a hill. Will my power supply suffice?

 

Depending on the size of the lathe, I suspect you may need gearing!
But I would set up a decent capacity supply and take some definitive measurements on the torque capability.
Max.

 

Depending on the size of the lathe, I suspect you may need gearing!
But I would set up a decent capacity supply and take some definitive measurements on the torque capability.
Max.

One step ahead, already working out a manual adjustment system with old bicycle gears and chains, and making a tension system to reduce start up jerk,
But probably not as important since I have a speed controlled one now,

 

Depending on the size of the lathe, I suspect you may need gearing!
But I would set up a decent capacity supply and take some definitive measurements on the torque capability.
Max.

Also small lathe, only bought a 4 inch chuck. Planning on turning precise metal parts for models (plastic models so a barrel or pipe) in 1/35 scale, I have left over silver so maybe a ring, but mostly I’m interested in making mini machines and engines such as flame licker, steam and sterling

 

Many options that some take is to look for Junk or give-away Treadmills, they are a good source of DC motors, 2HP and up, and also the variable speed controllers.
Max.

 

I have a 24v bldc 400w motor, and I’m planning on using it for a lathe. These are usually used with a battery setup, but I’m planning on using a switching power supply. I’ve been reading up on electric scooter motors and it sounds like they draw 1-5 amps with no load. I found a diagram for my motor View attachment 206611
On this diagram it shows a 40 amp switch/40 amp fuse. This is over current protection right? I was planning on using a 500w power supply to play it safe, and give myself some headroom. Is this going to draw a lot of amps if I’m turning metal? I wouldn’t think it would need as much power as pulling a 200lb person up a hill. Will my power supply suffice?

Just using the motor ratings and Watt's Law: P= IE or I = P/E: I = 400/24. Hence I = 16.66A

 

Many options that some take is to look for Junk or give-away Treadmills, they are a good source of DC motors, 2HP and up, and also the variable speed controllers.
Max.

Ahhhh there was a 60$ treadmill I saw a while back but neglected the opportunity Will look into them if this doesn't work.

 

Just using the motor ratings and Watt's Law: P= IE or I = P/E: I = 400/24. Hence I = 16.66A

Thanks for the formula, I was wondering if it was draw over that amount if more load was applied than would require 16.6 amps.