RE: [CAD_CAM_EDM_DRO] Re: home switches

Yes, your correct. Maybe an opto switch is more repeatable.


Peter Homann
mailto:Peter.Homann@...
Adacel Technologies Limited,
250 Bay St, BRIGHTON, 3186, AUSTRALIA
http://www.adacel.com <http://www.adacel.com>
Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
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> -----Original Message-----
> From: david_margrave [mailto:david_margrave@...]
> Sent: Wednesday, 24 March 2004 3:32 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: home switches
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Peter Homann"
> <peter.homann@a...> wrote:
> > Hi,
> >
> > The technique I use on my TurboTaig board is to combine the home switch
> > input with the 'home' (phase 0) signal from the stepper driver. I
> checked
> > the datasheet for the 5804 and it doesn't have this output. The 3977
> or the
> > ST L297 does though. This output on these components is there to solve
> > exactly your problem.
> >
>
> Peter,
>
> thanks. I suppose I could make my own phase0 signal with some TTL
> logic based on the outputs from the 5804? If I recall correctly they
> are grounded when the given coil is activated. I'm not sure whan they
> do in the inactive state, float to the supply voltage? I'm a bit
> rusty on the electronics since I finished the board months ago and
> have been mainly working on the mechanics.
>
> Is the basic idea here that the home signal = actual position in steps
> modulo 8? that's fine if your switch error is usually within an 8
> step range but what if it is more? get a precision switch I guess.
>
>
>
> dave
>
>
>
>
>
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