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

nothing spectacular, 550 in/oz 34 frame reduced 10:1 to a 1.25" dia.
pinion, with a gecko 201 drive..
As long as you keep available powergreater than required power (with a
decent margin), you'll never stall a stepper.
I"ve taken to running the table at 120 ipm rapids, as it allows me to
accelerate much quicker.
It does howver make rapids from one end of the table to the other
somwhat tedious to watch.

erie

R Rogers wrote:

>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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