Re: [CAD_CAM_EDM_DRO] Why is my feedrate slow with stepper motor

In a message dated 22-Mar-02 22:06:14 Central Standard Time,
rnichol1@... writes:

> Is this normal for stepper motors? I'm thinking of designing a
> current limiting or chopper(?) circuit but do not know electronics.
>
> I'm guessing others have been here already. Will a chopper circuit
> work? could the k-cam software be part of the problem (I get
> a "stop" for one cycle every rev that gets more pronounced with speed
> rate)
>
> Any comments / advice?

Roger: This is what it's all about! A properly designed stepper-motor
driver of either the "old" L/R type, or the new ("only kind to even consider
these days!") "bipolar chopper drive" usually takes-in at least 24 VDC, and
feeds the motor with "constant current" (well, ideally, anyway). 12 VDC is
way-low!

Why re-invent the wheel? A couple of guys on this group manufacture/sell
bipolar-chopper drives, and MY choice is Mariss' Gecko Drive G210. It does
what you want, AND will keep the speed "up", if your DC supply is at least 24
volts. Maybe on up to 80! Mariss might comment. HIS advice is gospel!

Jan Rowland


[Non-text portions of this message have been removed]