Rong Fu mill won't run at high speed

[ARC-170]

I have a Rong Fu mill that is currently wired for 120V. I changed the belts to run it at high speed and it would not move; it just hummed. I lowered the speed one level and it worked. Is this a motor issue or can this be solved by having the machine run on 240V? I thought maybe it was drawing too much current. It's on a 15A circuit and uses 23 A. It did not trip the breaker. Thanks!

 

[fixit]

Same problem with mine when new. Mine would start but took forever to reach top speed. Change it to 240 volts to solve your problem.

 

[markba633csi]

Your house wiring has too much voltage drop- you should configure the machine for 240 volts
If you need help with that post a pic of your motor junction box terminal strip
It's also possible that your start capacitor is weak/low value
Any motor over 1 hp should be run on 240v

 

[Shotgun]

Have you tried giving it a spin by hand before flipping the switch?
There is drag on the spindle, and the motor has very low torque on start-up. Even a little spin might get it out of the torque hole to where it has enough to overcome the drag, and then slowly start building up.
When I first had my Wrong-Fu, it would throw a breaker in high gear.

 

[mksj]

Check the motor capacitors, I would give more specifics as to the motor specifications/mill model. Surprised you would be running it on 120VAC 30A circuit, at 23A running is high, the start-up current would be higher. Switch to 240VAC.

I think my Rong Fu mill's original motor is about to die?

During the milling the motor came to a stop (with the click/relay noise) and started buzzing (like electricity energizing a transformer) as if there's load on it but there was none. I flipped the switch to off and then back on (even tried reverse) and it just made the same buzzing noise. Pressed...

www.hobby-machinist.com

 

[ARC-170]

I wired the garage for 240V. I'm about to switch over the machine. I thought it might be a capacitor, based on what I've read elsewhere, but I thought I'd ask here to get a more specific answer.

I did try to give it a spin by hand, but that didn't seem to work, IIRC.

 

[ARC-170]

Check the motor capacitors, I would give more specifics as to the motor specifications/mill model. Surprised you would be running it on 120VAC 30A circuit, at 23A running is high, the start-up current would be higher. Switch to 240VAC.

I think my Rong Fu mill's original motor is about to die?

During the milling the motor came to a stop (with the click/relay noise) and started buzzing (like electricity energizing a transformer) as if there's load on it but there was none. I flipped the switch to off and then back on (even tried reverse) and it just made the same buzzing noise. Pressed...

www.hobby-machinist.com

I'm running it on a 15A circuit, so I'm surprised it runs at all!

I'll hook it up to 240 and report back. I posted another thread about that. Go to post #34.