Re: [CAD_CAM_EDM_DRO] motor types

From what I remember Wayland that's it. Servos are handy obviously because
the rotor is not going to always be in the exact spot the controller tells
it to be 100% of the time. Servo's sometimes have a tachometer as well to
measure the actual rotor speed. The encoder will be at the end of the motor
and will have little wires coming out which give the feedback, make sure the
ones on the motor your pop has aren't just the supply for the motor. Servos
are smooth running, quiet, quick and accurate. They're expensive as well.
Not so much the motors but the things needed to run them which can be
'pricey' compared to steppers. If you are planning to fit the servos to a
large, accurate machine that will be running under quite a demand (I.e. must
work quickly and accurately) then it's worth it. If you are fitting them to
a Sherline to just mill bits that you don't mind taking a little longer it's
best to go with steppers. Where is your pop finding all these darn motors
anyway? I know you mentioned him working with was it printers and
photocopiers?

John

> Howdy John~!
>
> So you mean to tell me that a "servo" is
> just a "brushless dc" motor with an encoder attached? (:o)
>
> So, if my Pop tells me he has a "brushless dc" motor with
> a little round black box attached to the back of it
> that has wires coming out of it, I should run, not walk, to go get it?
>
> I can't believe it's that simple...Brushless DC + Encoder = Servo.
>
> Thanks, John.
>
> Weyland