Re: [CAD_CAM_EDM_DRO] SPINDLE INDEX PULSE

Oops that wont work, Here it is :-)

///////////////////////////

Hi

I am using the same cnc4pc board on my 20,000 rpm spindle using a
50mm dia disc and it only has a 5mm slot in and using the supplied
sensor,and it tracks the speed perfectly from 0 - 20,000rpm so i do
not think the slot width would be a problem.

Regards
Mark


--- In mach1mach2cnc@yahoogroups.com, "Arturo E. Duncan"
<aduncan@...> wrote:

>
> Steve,
>
> You mentioned you had the same cnc4pc sensor as Donny has and had
> similar symptoms. In your case the problem was solved by widening
> the slot to 45 degrees. You state your disk is 3" and run at 4500
> rpms. That will require at least a 5.4 deg slot or 0.150" slot.

That

> would give you a 200uS exposure. That is what is required by

mach.

> If you have anything bellow that I guess it could be possible you

got

> those symptoms. Would you please confirm what size of slot you had
> before?
>
> Donny's slot gives him a 400uS, which I believe is plenty.

According

> to the sensor's datasheet, it will react at 8uS.
>
> Arturo Duncan
> http://cnc4pc.com
>
> --- In mach1mach2cnc@yahoogroups.com, "Stvracer" <stvracer@> wrote:
> >
> > Donny,
> > The disk is 3 inch diameter and the slot is 1.5 inch around the
> outside.
> >
> > Steve K
> > SKFab
> >
> >
> > ----- Original Message -----
> > From: "hodarthestrange" <hodarthestrange@>
> > To: <mach1mach2cnc@yahoogroups.com>
> > Sent: Sunday, April 30, 2006 5:51 PM
> > Subject: [mach1mach2cnc] Re: Index Pulse Card setup with campbell
> breakout
> > board
> >
> >
> > > Steve,
> > > How wide is the bottom of your slot?
> > >
> > > Donny
> > >
> > >
> > >
> > > --- In mach1mach2cnc@yahoogroups.com, "Stvracer" <stvracer@>
> wrote:
> > > >
> > > > Donny,
> > > > I have the same sensor and had the same symptoms as you
> describe,
> > > today I
> > > > opened the slot to about 45 degrease of the rotation and it
> seem to
> > > correct
> > > > the rpm up to 4200 rpm which is my top spindle rpm hope this
> helps.
> > > >
> > > > Steve K
> > > > SKFab
> > >

wanliker@... wrote:

In a message dated 5/12/2006 2:57:05 P.M. Mountain Daylight Time,
rogersmach@... writes:

used with like a 90 degree section missing


That would be a horrible disc, something has to be wrong to need that. IMHO

bill


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