Re: [CAD_CAM_EDM_DRO] Using Gecko with Flashcut - was Re: best servo drives

Steve, others,

FlashCut has recommended replacing the opto's with transistors in the
past. I believe they have a mod documented for this.

I missed my opportunity to investigate this further for a friend.

Alan KM6VV


"Steve Stallings " wrote:

>
> Interfacing issues are probably the cause of the
> problems here. Both the Gecko and Flashcut products
> are well respected, but have interface requirements
> that are sometimes not met when connected to other
> equipment.
>
> Gecko drives have a step/direction signal hold time
> requirement that may not be satisfied by the Flashcut
> system.
>
> Flashcut uses opto-isolators in their standard output
> configuration. This would likely cause problems if
> the standard configuration was used with a motor
> driver that also contained opto-isolation of its
> own. This is because opto-isolators are not well
> suited to driving other opto-isolators and signal
> rise time issues result. Some Flashcut users have
> bypassed the internal opto-isolators and reported
> success.
>
> There may also be issues with signal polarity and
> timing being set properly in the Flashcut configuration.
>
> I have been talking to a Flashcut user who is having
> this type of problem and hope to borrow his system
> in an effort to sort out the problems using a
> storage scope. If all goes well I will report on
> the results in a week or so.
>
> Regards,
> Steve Stallings
> www.pmdx.com