Gene Heskett schrieb:
/snip/
> But I wanted something at about 40 volts for the lathe & wound up making an
> unregulated linear for 10% of the cost of a switcher at the time. Loaded
> up, its doing about 37 volts so I missed my target, but it gets the job
> done, moving the lathe at very good
A well designed rotary converter can help some
with providing usable 3 phase to a VFD, but a
static converter is useless because, unlike an
actual motor, the VFD has no inductance to work
with for phase shifting.
Steve Stallings
> -Original Message-
> From: Kirk Wallace [mailto:kwall..
On Wed, Nov 21, 2012 at 2:37 AM, Claude Froidevaux wrote:
> If you put neutral on terminal L1 and phase on terminal 2 and 3, it
> will simply parallel 2 leg of the rectifier, this will change nothing.
>
Well, my original idea assumed that the 3phase input would have the Y / wye
configuration, so
I have a rather interesting datasheet from Allegro. They have a sensor
that detects either a magneic codewheel, or a gear tooth (with a
biasing magnet behind the sensor).
The neat part is that the pulse width is 45uS in one direction, and
90uS in the other.
It is intended for crankshaft sensing, wh
As much as I know, all VFD are 3 phases connected (without central
connection available) (some are only 2 phases, but there is still a full
bridge rectifier)
The scheme you wanted to use will make a doubling of the voltage, most
probably killing the VFD (about 640Vdc on the bus if main line is
On Wednesday 21 November 2012 15:46:42 Peter Blodow did opine:
> Gene Heskett schrieb:
>
> /snip/
>
> > But I wanted something at about 40 volts for the lathe & wound up
> > making an unregulated linear for 10% of the cost of a switcher at the
> > time. Loaded up, its doing about 37 volts so I
On Wednesday 21 November 2012 16:05:50 andy pugh did opine:
> I have a rather interesting datasheet from Allegro. They have a sensor
> that detects either a magneic codewheel, or a gear tooth (with a
> biasing magnet behind the sensor).
> The neat part is that the pulse width is 45uS in one direct
I have used these on a competition robot before.
They were set up to detect sprocket teeth.
Worked great until the mount got a little loose, then it got ground to dust
(the magic smoke leaked out at that point).
Ray
--J. Ray Mitchell Jr.
jrmitche...@gmail.com
(818)324-7573
A foolish faith in au
Hello!
I have Ubuntu 12.04 on my laptop and I have LinuxCNC 2.5.1-33-g03be66a
sim-only package installed.
What I am not sure about is - how am I supposed to install my
kinematics module in this case? Is it the same way as usually -
install linuxcnc-dev package, get source from git and then "sudo
On 21 November 2012 21:10, Gene Heskett wrote:
> A 100mm wheel is a bit large for my small lathe, but probably fine for the
> 9" and up stuff, and if its quadrature direction sensing too, or 2 sensors
> could be made so, then it sounds like something that would be a heck of a
> lot less fuss to i
On Wednesday 21 November 2012 17:49:39 andy pugh did opine:
> On 21 November 2012 21:10, Gene Heskett wrote:
> > A 100mm wheel is a bit large for my small lathe, but probably fine for
> > the 9" and up stuff, and if its quadrature direction sensing too, or
> > 2 sensors could be made so, then it
On 21 November 2012 22:57, Gene Heskett wrote:
> Ahh, so. Do you have a link so we are on the same page with our thinking?
http://www.allegromicro.com/en/Products/Magnetic-Speed-Sensor-ICs/Transmission-Sensor-ICs/ATS692.aspx
> Am I to understand that turning one way its a 90 degree duty cycle
On Wednesday 21 November 2012 18:41:41 andy pugh did opine:
> On 21 November 2012 22:57, Gene Heskett wrote:
> > Ahh, so. Do you have a link so we are on the same page with our
> > thinking?
>
> http://www.allegromicro.com/en/Products/Magnetic-Speed-Sensor-ICs/Transm
> ission-Sensor-ICs/ATS692.
On 21 November 2012 23:53, Gene Heskett wrote:
> And I am thinking that an index for that could be obtained by drilling a 2
> or 3mm hole in the added disk and setting a 2nd such device to sense the
> hole going by.
I think it makes sense to do index the same way as engines do, just
have a short
I've finally been able to circle back to this, thanks for the feedback. I
do use pncconf and have the spindle display selected with encoder feedback,
but it looks to me like the filtered and abs signals are from the encoder
feedback input rather than the motion command output and so not suitable
f
On Wednesday 21 November 2012 21:30:14 andy pugh did opine:
> On 21 November 2012 23:53, Gene Heskett wrote:
> > And I am thinking that an index for that could be obtained by drilling
> > a 2 or 3mm hole in the added disk and setting a 2nd such device to
> > sense the hole going by.
>
> I think
andy pugh wrote:
> I have a rather interesting datasheet from Allegro. They have a sensor
> that detects either a magneic codewheel, or a gear tooth (with a
> biasing magnet behind the sensor).
> The neat part is that the pulse width is 45uS in one direction, and
> 90uS in the other.
> It is intend
On Wednesday 21 November 2012 21:33:16 Scott Hasse did opine:
> I've finally been able to circle back to this, thanks for the feedback.
> I do use pncconf and have the spindle display selected with encoder
> feedback, but it looks to me like the filtered and abs signals are from
> the encoder fee
Gene Heskett wrote:
> A 100mm wheel is a bit large for my small lathe, but probably fine for the
> 9" and up stuff, and if its quadrature direction sensing too, or 2 sensors
> could be made so, then it sounds like something that would be a heck of a
> lot less fuss to install & make work. IOW,
On 11/20/2012 11:28 AM, Gene Heskett wrote:
> But I wanted something at about 40 volts for the lathe & wound up making an
> unregulated linear for 10% of the cost of a switcher at the time. Loaded
> up, its doing about 37 volts so I missed my target, but it gets the job
> done, moving the lathe at
On Thursday 22 November 2012 01:07:50 cogoman did opine:
> On 11/20/2012 11:28 AM, Gene Heskett wrote:
> > But I wanted something at about 40 volts for the lathe & wound up
> > making an unregulated linear for 10% of the cost of a switcher at the
> > time. Loaded up, its doing about 37 volts so I
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