Re: [CAD_CAM_EDM_DRO] Re: loosing steps

medium speed is about 60 on the EMC scale for feed override . it makes a
clicking sound and then it goes but out of sync.

mariss92705 wrote:

>
> Gene,
>
> One winding goes to 3,4 and the other winding goes to 5,6. It makes
> no difference if 3 and 4 are interchanged (or 5 and 6). All that will
> happen is the direction will change.
>
> What is a medium speed? When you say it skips, does the motor stall
> or does it keep running? From where are you getting the +5VDC that
> goes to terminal 10?
>
> If you want to, give me a call at 714-771-1662. That might be quicker.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@y..., Gene <capper@i...> wrote:
> > I'm using gecko 201 drives. Phase current is 82k for 4.5 amp motor.
> > transformer is rated at 10 amps. cap is 20000 uf. I can set the
> > transformer at 40 volts or 70 volts. It does all right at slow
> speeds.
> > at medium speed it skips. the only thing im not sure about is the
> order
> > the 2 A phase and 2 B phase are connected to the geckos.does each
> phase
> > have a + or - ?
> >
> > mariss92705 wrote:
> > >
> > > Gene,
> > >
> > > Whose drives are you using?
> > >
> > > At what speed (full steps per second) are loosing steps? If it is
> at
> > > low speeds (below 600 full steps per second), a higher voltage
> will
> > > not help. At higher speeds the motor will simply stall and not
> finish
> > > the move.
> > >
> > > Are you sure you are using the correct phase current?
> > >
> > > Describe your power supply. What size filter capacitor (uF)?
> Current
> > > rating of the transformer?
> > >
> > > Unless you are meaning to overheat and damage your motor, please
> > > observe the "nebulous" 20-25 voltage ratio. It was arrived at by
> > > testing many many motors instrumented with thermocouples and
> > > measuring dissipated power versus supply voltage.
> > >
> > > Mariss
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., Gene <capper@i...> wrote:
> > > > 8 wire motors in parallel
> > > >
> > > > Jon Elson wrote:
> > > > >
> > > > > Gene wrote:
> > > > >
> > > > > > If I turn it up much it will go over the 20-25 voltage ratio
> > > > >
> > > > > So, it is more important to satisfy a nebulous ratio handed
> down
> > > > > from who knows where, than to have a system that performs to
> > > > > your needs.
> > > > >
> > > > > Do you know what will happen if you exceed this ratio?
> probably,
> > > > > nothing. At worst, the motors will run a little warmer.
> Check
> > > > > with Mariss if you are using Gecko drives, but I suspect that
> if
> > > the
> > > > > driver is rated for higher voltage, there will be no harm in
> > > testing
> > > > > that way. If the motors get too warm for your liking, you can
> > > > > look into other motors and other solutions. But really, the
> > > > > fundamental differences between running a 2 V winding motor
> > > > > at 40 V and 70 V should not be very significant. The 70 V
> > > > > power supply should allow you to go nearly twice as fast
> before
> > > > > losing steps.
> > > > >
> > > > > Are these 4 , 6 or 8 wire motors?
> > > > >
> > > > > Jon
> > > > >
> > > > > Addresses:
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> there, for OT subjects, that are not allowed on the CCED list.
> > >
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> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this as a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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