Re: [CAD_CAM_EDM_DRO] which steppers to buy?

marble here wrote:

> Ok Group every one is saying to use at least a 200oz
> stepper .I called Smithy and asked then what they
> would suggest stepper s for the 17X20 3 in 1 they sell
> I was told that a 150 oz stepper and a 3:1 timing gear
> now I am confused is this rating they say too small I
> do have these stepper s now. I thought I should give
> them a try just for the heck of it . Am I looking for
> trouble using a small stepper I know that I can not
> get any real speed out of them , but going slow I
> think may be go till I learn more.

Well, there is no specific motor size required. It is always
a speed/acceleration/torque tradeoff. You could use a very
small motor and a high belt reduction ratio, but the top speed
will be more limited. You have which motors now, the 150 Oz-In?
If you already have the motors then probably you should start with
them, especially if they are already mounted on the machine.
Now, you should be aware that the larger motors require a higher
current driver, so if you haven't already bought the drivers,
you might keep in mind that a few extra dollars now could
prevent you having to completely replace the drivers if you
want to upgrade the motors later.

Another concern is the software. If the software can't deliver
higher rates anyway, then bigger motors won't buy anything at all.

Jon