[Dave's_Not_Here]

... I have no experience in the elecrical side of anything other than changing light bulbs and that is a challenge... but in looking for hardware components for my mill build-up, I came across this...

Is it anything a Servo person might be interesed in? I know it is Open Loop and it seems most people don't like that... anyway, just thought that maybe it could be a find for someone... maybe not...

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1

[Dave's_Not_Here]

If anyone has any comments about this, please add to the thread. I would like to learn from you and others might as well...
Thanks! :withstupi

[Al_The_Man]

According to the manual, the 701BDC is closed loop? 700 is open loop.
Al.

[Dave's_Not_Here]

... I was wondering... just goiong by what the seller said... didn't think anyone would be interested in an open loop servo.. kind of defeats the purpose of a servo installation, doesn't it?

Is there any "value" in what he is selling for the likes of us here...?

ie. More headaches to make it "work" than what it's worth...,

only works with $5,000 servos...,

Needs $2,500 worth of additional parts to function...

Just trying to learn what is "useable" and what to stay away from...
Thanks...

[Al_The_Man]

I believe by feedback, they are refering to the fact there is speed feedback to the drive, similar to a tach on a DC servo amp, BTW this has nothing to do with positioning.
Both their models require hall effect sensors from motor to drive.
On current servo amplifiers in a CNC environment, speed feedback to the drive is not usually necessary as amplifiers are used in the torque mode and feedback to the control is via encoder back to the motion controller.
The speed feedback is usefull in non CNC applications where the manual control, for example by pot. is used a speed controller.
Al.