Re: [CAD_CAM_EDM_DRO] Re: VFD tachometer sanity check

Jeff
Ok, you are reading the RPM as a voltage of 0 to 10v and converting it to
RPM reading, should work fine, are you using a digital display?
Jim


Jim

----- Original Message -----
From: "washcomp" <jeff@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, November 22, 2003 1:09 PM
Subject: [CAD_CAM_EDM_DRO] Re: VFD tachometer sanity check


> Jim:
>
> Yes. I was figuring on using the max RPM reading (on a voltmeter)
> to be calibrated to 10 volts analog output which is linked to the
> frequency.
>
> Jeff
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "James Cullins"
> <jcullins@c...> wrote:
> > Jeff
> > I have been thinking about that myself. Wouldn't you need a way
> to set up
> > the max RPM
> > to indicate the RPM correctly?
> > Thanks
> > Jim
> > ----- Original Message -----
> > From: "washcomp" <jeff@w...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Saturday, November 22, 2003 7:40 AM
> > Subject: [CAD_CAM_EDM_DRO] VFD tachometer sanity check
> >
> >
> > >
> > > I'm thinking of buying a variable frequency drive for my
> Bridgeport.
> > >
> > > The 10 Volts off the analog contacts of the VFD can be set to be
> > > proportional to the frequency.
> > >
> > > If the RPM is linear to the frequency (after slip has been taken
> > > into account), and if the voltage is linear to the frequency,
> then
> > > shouldn't the voltage be linear to the speed?
> > >
> > > If this is the case (the real question I'm asking), once the
> setup
> > > is calibrated, this should give the ability to have an accurate
> > > electronic analog tachometer on the control pendant I'm designing
> > > without resorting to an additional optical encoder.
> > >
> > > I figure a tachometer would be useful for "manual" machining and
> > > sanity checks on CNC milling.
> > >
> > > Any thoughts, comments or suggestions would be appreciated.
> > >
> > > Jeff
> > >
> > >
> > >
> > >
> > >
> > >
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> 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 to be 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........
> bill
> List Mom
> List Owner
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