Re: Bridgeport retrofit servo questions

Thanks Les.

I realize there are no gaurantees anywhere...one of the risks you
take when undergoing a task such as this. If 1:1 will work,
great...if not it still may be possible to sneak a 1:1.5 ratio setup
in the stock cover to gain a little bit. Otherwise I will have to
make reduction assemblies.

Hopefully the Rutex, while more complex than the Gecko, will
ultimately be a better setup. I like the higher voltage ceiling in
the event that I decide on different motors etc. I like the tuning
options on the Rutex as well.

-Brady

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

> Hi Brady,
>
> >Really???!!! Sounds to me like this might be a winner. If I don't
> >have to do a reduction, life just got a whole lot easier! Yes, the

BP

> >steppers DO use a 5/8" shaft...that would make these motors a no
> >brainer.
> >
> >
> Just remember I am not saying that these motors WILL work, I have

never

> used them so I cannot be sure. However they do look good and I

can't see

> any reason why they shouldn't work.
>
> >I know somewhere in my travels there was mention of someones

encoder

> >being TOO fine for the servo driver...What encoder would you
> >recommend/suggest I look into for this app? Will the surplus

center

> >one work? US Digital? Renco? Any particular model? I'm pretty sure
> >that there is a 5v limit on the Rutex & Gecko encoder supply...I
> >thought that the Campbell BO board had a power supply on there for
> >the encoders too? Am I mistaken?
> >
> >
> From my experiences with my mill 200 lines at 2.4:1 was pretty

much the

> minimum. This equates to near enough 500 lines at 1:1. I would have
> thought anything less than 2000 lines would work fine. Above that

your

> are probably going to be spending more money for no noticeable

gain.

> Both the Rutex and Gecko drives expect to use a 5V encoder. They

both

> output 5V so you don't need an independent 5V supply. I have heard

good

> things about the US Digital HEDS range of encoders. They are

reasonably

> priced and seem to work well. The lower priced encoders come as a

disc

> and a reader module. You have to find a way of mounting the disc on

the

> shaft and the reader in the right place to read the disc. You need

to

> protect them from dust and direct bright light. The more expensive
> encoders come as a complete sealed unit that looks like a small

motor.

> This can be directly driven off the motor/screw or belt driven if

it is

> more convenient.
>
> Les