CAD CAM EDM DRO - Yahoo Group Archive

Re: VFD tachometer sanity check

Posted by washcomp
on 2003-11-22 15:48:28 UTC
Oh, what the heck. I just bought this on E-Bay:

http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&item=2573683479&ssPageName=ADME:B:EOAB:US:6

I'm not 100% sure that its what I'm looking for, but its promising
and cheap enough to give it a shot.

Jeff


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "James Cullins"
<jcullins@c...> wrote:
> You may be able to use a digital panel meter the calibrate it to
read what
> you want.
> Jim
> ----- Original Message -----
> From: "andyolney" <andy@o...>
> 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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> > > > > timg@k...
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> > > >
> > > > OFF Topic POSTS: General Machining
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> > 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/
> > > >
> > > >
> > > >
> >
> >
> > Addresses:
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wanliker@a...,
> timg@k...
> > Moderator: pentam@c... indigo_red@q... [Moderators]
> > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> > 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/
> >
> >
> >

Discussion Thread

washcomp 2003-11-22 05:40:28 UTC VFD tachometer sanity check James Cullins 2003-11-22 06:07:42 UTC Re: [CAD_CAM_EDM_DRO] VFD tachometer sanity check turbulatordude 2003-11-22 06:41:54 UTC Re: VFD tachometer sanity check washcomp 2003-11-22 11:03:43 UTC Re: VFD tachometer sanity check washcomp 2003-11-22 11:09:23 UTC Re: VFD tachometer sanity check James Cullins 2003-11-22 11:31:41 UTC Re: [CAD_CAM_EDM_DRO] Re: VFD tachometer sanity check washcomp 2003-11-22 11:54:52 UTC Re: VFD tachometer sanity check andyolney 2003-11-22 11:55:06 UTC Re: VFD tachometer sanity check washcomp 2003-11-22 13:14:43 UTC Re: VFD tachometer sanity check James Cullins 2003-11-22 14:12:07 UTC Re: [CAD_CAM_EDM_DRO] Re: VFD tachometer sanity check James Cullins 2003-11-22 14:12:11 UTC Re: [CAD_CAM_EDM_DRO] Re: VFD tachometer sanity check washcomp 2003-11-22 15:48:28 UTC Re: VFD tachometer sanity check Jon Elson 2003-11-22 17:39:04 UTC Re: [CAD_CAM_EDM_DRO] Re: VFD tachometer sanity check washcomp 2003-11-22 18:55:27 UTC Re: VFD tachometer sanity check