Re: Best source for Servo's ??

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <lesnewell@f...>
wrote:

> That 2.5hp is intermittent duty, force air cooled, In practise they
> should be rated more like 3/4 HP.

3/4 continuous ?

I have a couple old printer motors. Brushed, one is 35 volt 1.1 amps
both have encoders.

Both cog nicely. (if cogging is something you are looking for ) It
will offer a base from which to start.

I also have those Pitman motors (16 watt) from the hp plotters.

At least I'll have a place to start. pitman to treadmill motors...
it is a shame I don't have a real servo in the surplus.

Dave

>
> Les
>
> Jon Elson wrote:
>
> >>
> >>
> >For servo motion control or spindle? For axis drive, 2.5 Hp is

WAY

> >overkill. I'm running a Bridgeport
> >with motors rated for 1/8 HP (continuous) at 1725 RPM! I would

advise

> >using motors
> >slightly larger than this, as my acceleration is just a bit

limited with

> >this. Assuming a
> >2:1 peak torque rating for this motor, I develop a theoretical 715
> >pounds of linear force
> >on the table. (I can actually go twice that high, at least.)

That is

> >still plenty of force to
> >break cutters off at the collet. So, there's really no purpose

served

> >with these MASSIVE
> >servo motors people talk about, unless you need to accelerate in

1/4" to

> >400 IPM speeds.
> >Some router applications need this, but it is just not needed for

a home

> >shop CNC mill.
> >
> >Jon
> >
> >
> >
> >