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Different Nova 3K motor question

Hi all! I've had a Nova 3K for about 18 months. It came with a 1 HP A/C motor which I've been happy with. The motor would not stall, but when I got a catch the workpiece may stall and the belt would scream, but the motor would not stall. I was tired of changing pulleys to change speed, and even with all the comments about broken motor shafts, I broke down and recently bought a 1 HP DC motor (Leeson) and controller. I turned a few pens with my new setup and was happy with it. Then I mounted an ash bowl blank ( 8" diameter, 3" thick, not green but not dry either). I rough turned the outside without difficulty, but when I started to hollow it out the motor bogged down and would stall without to much effort on my part. Different pulley combinations would make it somewhat better, but not much. My tools are sharp! With my old A/C motor I could be aggressive and cut ribbons until the tool got too hot to handle! I don't think that will be a problem anymore. I finished the bowl but had to take very light cuts to aviod stalling the motor. I called the vendor (CSUSA) and they were helpful with a few suggestions, but it's difficult to describe this over the phone. I'd like to know if anyone else has had this experience. Is it just me? Am I still low on the learning curve? Is there a way to determine if the motor/controller may be defective? I feel like I'm working with a sewing machine motor! Thanks in advance for any advice/comments/suggestions.

Reply to
dale olsen
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dale olsen wrote: (clip) I finished the bowl but had to take very light cuts to aviod stalling the motor.(clip) ^^^^^^^^^^^^ Assuming that your DC motor does indeed develp a full horsepower, it will do so only at full speed. Since you bought the conversion to eliminate the bother of shifting belts, it stands to reason that you are using the variable speed control instead. This means that you are reducing the horsepower proportionately, as you reduce the speed. Previously, you increased the torque as you reduced the speed. The question is, if you use the belt to get lower speed and higher torque with the DC setup, running the motor full out, does it stall more than the AC motor did?

You may need more than a 1 HP DC motor to be satisfied.

Reply to
Leo Lichtman

It should still be constant torque anywhere below base rated motor speed. Which means it should pull as well as the AC on the same pulley combinations.

There's a good chance that the internal resistance compensation is not properly set. That is an internal adjustment labeled IR COMP in most drives. I'm not familiar with your particular drive - been years since I did any serious drives work, but... Call CSUSA again, and ask specifically how you should set that pot.

Jim

Leo Lichtman wrote:

Reply to
jim swank

I don't know which controller you have but the regular one and its setting has an effect on the motor. You should not have the controller set below 50% on the dial. Lower the speed on the bilet/pulley so that you can keep the moter controls at least to the 50% mark or higher. The torque is effected by the control setting....

Reply to
Darryl

Hi, I too got tired of changing belts on my 3K but I bought a 3 phase motor and VFD from Dealers Electric. I'm using a 1 1/2 HP and it is much stronger than my old 1 HP. The variable speed is beautiful I still change pulleys when I am really hogging out stuff but otherwise I pretty much leave it be. A 2 HP would have easily fit, seems like 3 phase motors are physically smaller than regular AC or DC of the same size. Try finding a local turning club and see if that type of setup might work for you and if you like it you can easily sell off the present motor setup you have now. Either way, good luck!!

Reply to
guy

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