Re: Has anyone made their own servos from DC Motors?

How 'bout a link to the surplus center you are referring to?
Googling it brings up a bit more than I care to sift through.

Thanks,
Rod


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

> Hi Chris,
>
> I used 110V treadmill motors from Surplus Center on my Bridgeport

Series

> 1 mill. The motors have a handy flange on the front that can be

used for

> mounting. Surplus center also sell a very small servo motor with a

200

> line encoder. I used the encoders off of these on the treadmill

motors.

> They work very well with Gecko or Rutex drives and I am extremely
> pleased with the results.
>
> I haven't yet got round to making up covers for the rear of the

motors

> but I must remedy that soon. Having exposed encoders on a mill is

a

> recipe for disaster.
>
> Les
>
> lcdpublishing wrote:
>
> >Has anyone made servos (that work well) from DC motors? I am not
> >sure but unless I am missing something, it seems very possible to

do

> >and affordable too.
> >
> >There are a host of 90 Volt DC treadmill motors out there for

very

> >cheap ($20.00 ~ $50.00). While the claimed HP is 2.5, I suspect
> >they are more close to 3/4 ~ 1 HP, which should be fine for small
> >servos on a home shop machine.
> >
> >Most of these motors have a small shaft on the back end which is
> >usually for a fan blade of some sort. This could be used to

attach

> >a rotary encoder with relative ease. Rotary encoders can be
> >purchase new from US Digital for around $35.00.
> >
> >This gets you a motor and encoder for less than $100.00
> >
> >Next up is an enclosure of sorts for the motor to make it

suitable

> >for use in a metalworking shop. This could be any form of

aluminum

> >from square tubing to round tubing (if the id matches the od of

the

> >motor). Incorporating a flange for mounting should also be

pretty

> >easy to do. I suspect this would add another $40.00 or so.
> >
> >In the end, you could have a decent sized servo for around

$140.00

> >give or take a few bucks.
> >
> >I don't know what else is different about a servo than from what

was

> >just described (I am sure they are little more heavy duty for
> >industrial use). The electricals is something I am unsure of.
> >Encoders are encoders - that isn't much of a problem. But not

all

> >DC motors are the same (I am guessing).
> >
> >Has anyone done this and how did it work out for you? Any
> >suggestions on what type of motor to use or avoid? What about a
> >servo driver, Gecko or other?
> >
> >TIA
> >
> >Chris
> >
> >
> >
> >
> >
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