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

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "lcdpublishing"
<lcdpublishing@y...> wrote:

>
> Hi Les,
>
> I think I know which motors you are referring to. They have a round
> flange on the front but also have a bracket for base mounting. They
> are somewhat Gold in color and have a 1/2"-13 left hand thread on
> the large output shaft?
>
> I have one of those motors I just got working for a high speed
> spindle I designed/built for my CNC router. Even at 3:1 pulley
> ratio to get the RPMs up, the motor still has plenty of power for
> driving the cutter. This is what got me to thinking I could use
> these motors for servos.
>
> You say this combination worked well on both Geckos and Rutex. Was
> one easier than the other to setup and get running good?
>
> Are the 200 line encoders good enough, or would you prefer to have a
> higher resolution?
>
> TIA
>
> Chris
>

Chris,
After having had a word with Les only the other day i am also going
down this path.
I have two motors but struggling to find a third.
We have plenty of threadmills here but they are 240 V Dc working.

You are correct about the description of the motor. i have stripedone
for a good look and they are built to a price, most of the
construction being pressed steel.
In my case one problem is the extended pressed steel bearing housing
on the end.

http://tinyurl.com/5ezdt

This carries a standard 6203 metric bearing17mm ID x 40mm OD x 12mm wide.
I have started making a new thick alloy carrier to take a heavier
bearing, a 6303 which is 47mm OD x 14mm wide.
This will up the load rating from 9,900 Cr to 14,500 Cr
This is enough room to go up to 50mm without any other mods.
This will also have tapped holes in the end to be a direct replacement
for the original motors on the mill.

I also aim to extend the shaft anout inch and do away with the 1/2"
lefthand thread, just having a parallel keyed shaft for the pulley to
sit on.
I havn't decided just whatto do on the other end, whether to modify
the existing brush housing to take an encoder or to make a complete
new brush housing.

John S