Re: [CAD_CAM_EDM_DRO] Re: Servomotors & Minimill - do these need speed reduction or not?

erie <erie@...> wrote:
Fred,
In that instance (mini mill with fine pitch leadscrew) you are correct,
however, outside of that small cosmos, steppers are quite valid. In fact,
I'd welcome you to come over and take a ride on my 13' long gantry (~800
lbs) rapiding at
300 or so ipm, hasn't missed a step in 3 years.

You must have one hell of a stepper motor on that......

bet I can get those $20
servos to fault in 5 seconds
or less on my machine...:)

I'd bet you arent using a $20 Ebay copy machine stepper motor.

All kidding aside, there are instances where servos outperform steppers,

They always outperform steppers. Do a google for servo verses stepper graph.

but when both are operated within
their limits (with suitable reserves for accleration) they can both
perform well.

erie

>Try $25 cheap servo motor with encoder + $65 driver = superior
>performance on a hobby budget. No more 8 inches per minute rapids
>(unless you "like" to waste your leisure time with things like
>watching water boil, or corn grow) = steppers, or lost steps =
>steppers. The decision is much more toward the servo solution today.
>
>
>

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