Re: [CAD_CAM_EDM_DRO] Need Source for Large Servo Motors

Mariss increased the I term to smooth out the motion at low speeds. In
my experience with tuning motors, increasing I slows down the response
rather.

I used treadmill motors from www.surpluscenter.com. These ones are
similar to the ones I bought:
<http://www.surpluscenter.com/item.asp?UID=2006082403061875&item=10-1783&catname=electric>
They are cheaply made motors but they do use ball bearings. Torque and
velocity ripple are surprisingly low. They will turn smoothly on a 1.5V
D cell. I don't know the maximum continuous rated torque. I run mine on
80VDC, geared 3:1 on my Bridgeport and they work very well. The only
time I can get one hot is to do a lot of deep peck drilling (the quill
has a lot of viscous friction so it takes a lot of power to rapid).

Les

> You should note that Mariss of Gecko Drives had to modify his G320 drive
> to run Keling's motor
> without excessive torque and velocity ripple. Gecko is not selling the
> modified servo drive yet.
> I don't know if they will sell a special model. In other words, there
> motors were not really
> made for positioning servo work.
>
> Jon
>
>