Re: [CAD_CAM_EDM_DRO] Re: VFD tachometer sanity check

You may be able to use a digital panel meter the calibrate it to read what
you want.
Jim

----- Original Message -----
From: "andyolney" <andy@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, November 22, 2003 1:54 PM
Subject: [CAD_CAM_EDM_DRO] Re: VFD tachometer sanity check


> Harbor Freight has some digital multimeters for $3 at the momont and
> it occurred to me that at that price you could afford to hack one of
> these up for a tachometer display. Andy
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "James Cullins"
> <jcullins@c...> wrote:
> > 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@w...>
> > 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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> > >
> > > 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.
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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
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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>