There is a much smaller CNC mill ( with 4th axis, I think) for sale on Public
Surplus. As of today it is listed at $355. Akron, Ohio.
http://www.publicsurplus.com/sms/uakron,oh/auction/view?auc=1528956
On Tuesday, January 26, 2016 11:35 PM, Dave Cole <[email protected]>
wrote:
On 1/26/2016 11:47 AM, andy pugh wrote:
> On 26 January 2016 at 07:00, Dave Cole <[email protected]> wrote:
>> If Siemens can't get standard AC squirrel cage motors to position
>> precisely, I doubt that anyone can.
> They can't with standard induction motors. But induction servo motors
> do exist and Siemens make them:
> https://support.industry.siemens.com/tf/ww/en/posts/asynchronous-servo-motor-v-s-asynchronous-motor/75942/?page=0&pageSize=10
The term "servo motor" does not necessarily imply a positioning drive.
This is Siemens explanation since they make so many drives and motors
for different uses:
https://mall.industry.siemens.com/mall/en/WW/Catalog/Products/10045149?tree=CatalogTree
Notice that the 1PH8 motors are Simotics M main motors and they say they
are for precise and smooth running of rotary axes.
The Simotics S is the true positioning servo motors that are put on CNC
machines for position drives.
Years ago (early 90's) when I was working for Siemens, I visited a
company in or near Cleveland, OH that was making high end spindle drives
and motors.
I forget the company's name. But the company contacted Siemens since
they wanted to use Siemens drives with their motors. I think I was one
of the first guys to visit the company from
Siemens. At the time, the existing Siemens drives could not control
their motors. Their motors were a hybrid motor that could be act as an
induction motor at high speeds yet could do very accurate positioning at
low speeds with decent torque. It was a near perfect motor for a
machine tool spindle. About a year later Siemens bought the company
and acquired their patents and dissolved the company. I met the
company owner and I think he was happy to sell out to Siemens. I'm
sure that he did very well in the sale.
Dave
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