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Re: Photos-index pulse sensor

 

--- In mach1mach2cnc@..., Andy Wander <awander@v...>
wrote:
I like it, except I'm clumsy enough that I would be sure to
destroy it while
sliding something thru the spindle bore.
It clears the bore area. Bending the wires a little more will give
extra clearance, and a smaller/different sensor may fit better. For
me, the system will stay clean here.
John (bloy)
Re: Question on index pulse

Les Newell
 

Hi Andy,
If you average a steady state PWM signal (apply a low pass filter) you get a DC voltage. At 0% PWM you get 0V, at 50% PWM you get 1/2 voltage and at 100% PWM you get full voltage and so on.
Now if you slowly change the pulse width your DC voltage will slowly change to follow it.

A VFD changes the pulse width in a sinusoidal pattern and the motor inductance acts as the filter. As long as the PWM frequency is much higher than the sine wave frequency (say 10kHz or highter) all the motor will see is the sine wave. By varying the pattern the VFD can control the sine wave frequency and voltage.

Les


Andy Wander wrote:

Les:
Thanks for the explanation-what I still don't understand about it is how the
"Sine Wave", which is generated by the "filtering" of the motor, will vary
in frequency, if the only thing that is done to it is to change the PWM duty
cycle. This would seem to me to get us to a "Sine wave" which has different
values for it's Positive and Negative half-cycles, but I can't see how the
frequency would change unless the frequency of the PWM changed.
Andy Wander
Verrex Corporation
Changing the background and color?

John D. Guenther
 

Hi All,

How do you change the backgroun and the background color on the Mach2
screen layouts. I have looked in the screen editor and screen
tweeker and can not seem to locate how to make these changes.

Thanks

John Guenther
Sterling, Virginia
Re: Photos-index pulse sensor

Andy Wander
 

I like it, except I'm clumsy enough that I would be sure to destroy it while
sliding something thru the spindle bore.

Andy Wander
Verrex Corporation

-----Original Message-----
From: Bloy2004 [mailto:jmnotions@...]
Sent: Monday, March 01, 2004 1:04 PM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Photos-index pulse sensor

Uploaded to "Bloy2004".... an idea for mounting sensor to Lathe
spindle of 3 in 1 machine (Shoptask specific)



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Photos-index pulse sensor

 

Uploaded to "Bloy2004".... an idea for mounting sensor to Lathe
spindle of 3 in 1 machine (Shoptask specific)
Re: Question on index pulse

Andy Wander
 

Les:

Thanks for the explanation-what I still don't understand about it is how the
"Sine Wave", which is generated by the "filtering" of the motor, will vary
in frequency, if the only thing that is done to it is to change the PWM duty
cycle. This would seem to me to get us to a "Sine wave" which has different
values for it's Positive and Negative half-cycles, but I can't see how the
frequency would change unless the frequency of the PWM changed.


Andy Wander
Verrex Corporation

-----Original Message-----
From: Les Newell [mailto:les@...]
Sent: Monday, March 01, 2004 12:54 PM
To: mach1mach2cnc@...
Subject: Re: [mach1mach2cnc] Re: Question on index pulse

A VFD creates an approximation of a sine wave by pulse width modulating
a high frequency carrier. The carrier frequency is high enough that the
motor effecively filters it out, leaving the sine wave. The frequency of
the sine wave is varied to control the speed of the motor.

This is not really much use to Mach2 as it is only the commanded speed
to the motor. It does not mean the motor will actually turn at that
speed. The best thing to do is fit a sensor on the spindle and have done
with it. That way Mach2 always knows the true speed of the spindle.

Les


Andy Wander wrote:

I can't speak about the intricacies of the VFD, but PWM is Pulse Width
Modulation, where the ONLY thing that is varied is the width of the "ON"
pulse(not both ON and OFF). This means that the frequency of the pulses
does
NOT change, just the ratio of ON-time to OFF time of a (quasi) square
wave.

If the width of both the ON and the OFF pulse changed(and was identical,
you
would NOT have PWM, you would have FM(frequency modulation) of a square
wave.

Andy Wander
Verrex Corporation




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Re: Question on index pulse

Les Newell
 

A VFD creates an approximation of a sine wave by pulse width modulating a high frequency carrier. The carrier frequency is high enough that the motor effecively filters it out, leaving the sine wave. The frequency of the sine wave is varied to control the speed of the motor.

This is not really much use to Mach2 as it is only the commanded speed to the motor. It does not mean the motor will actually turn at that speed. The best thing to do is fit a sensor on the spindle and have done with it. That way Mach2 always knows the true speed of the spindle.

Les


Andy Wander wrote:

I can't speak about the intricacies of the VFD, but PWM is Pulse Width
Modulation, where the ONLY thing that is varied is the width of the "ON"
pulse(not both ON and OFF). This means that the frequency of the pulses does
NOT change, just the ratio of ON-time to OFF time of a (quasi) square wave.
If the width of both the ON and the OFF pulse changed(and was identical, you
would NOT have PWM, you would have FM(frequency modulation) of a square
wave. Andy Wander
Verrex Corporation
Re: Question on index pulse

Andy Wander
 

Of course, by changing the width of the ON pulkse, while the frequency stays
the same, the width of the OFF pulse is changed also, in the opposite
direction.

For example a 50% PWM pulse train will look just like a square wave at that
frequency, because the ON pulse will be 50" of the period, and so will the
OFF pulse.

A 20% PWM will have the ON time at 20" of the period, and the OFF at 80%.

Etc..

Andy Wander
Verrex Corporation

-----Original Message-----
From: Andy Wander [mailto:awander@...]
Sent: Monday, March 01, 2004 12:40 PM
To: 'mach1mach2cnc@...'
Subject: RE: [mach1mach2cnc] Re: Question on index pulse

I can't speak about the intricacies of the VFD, but PWM is Pulse Width
Modulation, where the ONLY thing that is varied is the width of the "ON"
pulse(not both ON and OFF). This means that the frequency of the pulses does
NOT change, just the ratio of ON-time to OFF time of a (quasi) square wave.

If the width of both the ON and the OFF pulse changed(and was identical, you
would NOT have PWM, you would have FM(frequency modulation) of a square
wave.

Andy Wander
Verrex Corporation

-----Original Message-----
From: washcomp [mailto:jeff@...]
Sent: Monday, March 01, 2004 12:36 PM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Re: Question on index pulse

Unless I'm mistaken, (wouldn't be the first time), the way the
frequency variation manifests itself is by modulating the pulse
width. Pulses shorter and closer together = higher frequency.

Please correct me if I'm wrong.

Jeff

--- In mach1mach2cnc@..., Andy Wander <awander@v...>
wrote:
Of course, VFD means Variable Frequency, so is this actually a PWM
signal?
I'm so confused...

Andy Wander
Verrex Corporation

-----Original Message-----
From: washcomp [mailto:jeff@w...]
Sent: Monday, March 01, 2004 8:42 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Question on index pulse

I notice that "index pulse" can be checked on the parallel input to
pick up the true speed of a machine. Can the PWM frequency of a
VFD
be used for this? If so, can it be scaled in MACH2 to correspnd to
the speed (I believe speed is a linear function to frequency, but
the
numeric value of one will not be the same as the other.

Jeff





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Re: Question on index pulse

Andy Wander
 

I can't speak about the intricacies of the VFD, but PWM is Pulse Width
Modulation, where the ONLY thing that is varied is the width of the "ON"
pulse(not both ON and OFF). This means that the frequency of the pulses does
NOT change, just the ratio of ON-time to OFF time of a (quasi) square wave.

If the width of both the ON and the OFF pulse changed(and was identical, you
would NOT have PWM, you would have FM(frequency modulation) of a square
wave.

Andy Wander
Verrex Corporation

-----Original Message-----
From: washcomp [mailto:jeff@...]
Sent: Monday, March 01, 2004 12:36 PM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Re: Question on index pulse

Unless I'm mistaken, (wouldn't be the first time), the way the
frequency variation manifests itself is by modulating the pulse
width. Pulses shorter and closer together = higher frequency.

Please correct me if I'm wrong.

Jeff

--- In mach1mach2cnc@..., Andy Wander <awander@v...>
wrote:
Of course, VFD means Variable Frequency, so is this actually a PWM
signal?
I'm so confused...

Andy Wander
Verrex Corporation

-----Original Message-----
From: washcomp [mailto:jeff@w...]
Sent: Monday, March 01, 2004 8:42 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Question on index pulse

I notice that "index pulse" can be checked on the parallel input to
pick up the true speed of a machine. Can the PWM frequency of a
VFD
be used for this? If so, can it be scaled in MACH2 to correspnd to
the speed (I believe speed is a linear function to frequency, but
the
numeric value of one will not be the same as the other.

Jeff





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Re: Question on index pulse

 

No, it is the same base frequency. The width of the pulse ( length of time
it is high ) determines the energy it can deliver. 80% PWM = 80% of the time
it high and 20% is low.
Jim

----- Original Message -----
From: "washcomp" <jeff@...>
To: <mach1mach2cnc@...>
Sent: Monday, March 01, 2004 11:36 AM
Subject: [mach1mach2cnc] Re: Question on index pulse


Unless I'm mistaken, (wouldn't be the first time), the way the
frequency variation manifests itself is by modulating the pulse
width. Pulses shorter and closer together = higher frequency.

Please correct me if I'm wrong.

Jeff

--- In mach1mach2cnc@..., Andy Wander <awander@v...>
wrote:
Of course, VFD means Variable Frequency, so is this actually a PWM
signal?
I'm so confused...

Andy Wander
Verrex Corporation

-----Original Message-----
From: washcomp [mailto:jeff@w...]
Sent: Monday, March 01, 2004 8:42 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Question on index pulse

I notice that "index pulse" can be checked on the parallel input to
pick up the true speed of a machine. Can the PWM frequency of a
VFD
be used for this? If so, can it be scaled in MACH2 to correspnd to
the speed (I believe speed is a linear function to frequency, but
the
numeric value of one will not be the same as the other.

Jeff





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M=274551.4550177.5761904.1261774/D=egroupweb
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of
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Re: Question on index pulse

washcomp
 

Unless I'm mistaken, (wouldn't be the first time), the way the
frequency variation manifests itself is by modulating the pulse
width. Pulses shorter and closer together = higher frequency.

Please correct me if I'm wrong.

Jeff

--- In mach1mach2cnc@..., Andy Wander <awander@v...>
wrote:
Of course, VFD means Variable Frequency, so is this actually a PWM
signal?
I'm so confused...

Andy Wander
Verrex Corporation

-----Original Message-----
From: washcomp [mailto:jeff@w...]
Sent: Monday, March 01, 2004 8:42 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Question on index pulse

I notice that "index pulse" can be checked on the parallel input to
pick up the true speed of a machine. Can the PWM frequency of a
VFD
be used for this? If so, can it be scaled in MACH2 to correspnd to
the speed (I believe speed is a linear function to frequency, but
the
numeric value of one will not be the same as the other.

Jeff





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M=274551.4550177.5761904.1261774/D=egroupweb
/S=:HM/A=2019528/rand=446470174>

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Re: Still problem w/ Pulse Frequency

 

You may need to try the special driver. I believe there is a .BAT file that
will install it.
Jim

----- Original Message -----
From: "bartelian" <bartelian@...>
To: <mach1mach2cnc@...>
Sent: Monday, March 01, 2004 9:56 AM
Subject: [mach1mach2cnc] Still problem w/ Pulse Frequency


I just downloaded Mach2Mill and tried to configure it. The manual
says I should have about 24,600 Hz. My Puse Frequency starts high
but goes down to 1100-1200 Hz., the program will keep running (very
slowly) until the screen saver kicks in. Then when I hit a key to
return to the regular screen the P/Freq will go up to 25,500 Hz for
about 15 sec and then drop dramatically low again. I cannot
maintain
a consistant Pulse Freq. over about 1300 Hz.

I am running M2M Release 1.90 on a Compaq 2.6GHz, 512 Mb. So far I
checked to make sure Quicktime (Qtask.exe) is not installed, made
sure LAN is set to 100Mbps, disabled the screensaver, cleaned the
system with SpyBot, and started with a clean boot. So far nothing
works.

Thanks in advance for any help. The Program is just what I want,
but
don't know if it will work on my computer. Bill B









Yahoo! Groups Links
Re: Question on index pulse

Andy Wander
 

Of course, VFD means Variable Frequency, so is this actually a PWM signal?
I'm so confused...

Andy Wander
Verrex Corporation

-----Original Message-----
From: washcomp [mailto:jeff@...]
Sent: Monday, March 01, 2004 8:42 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Question on index pulse

I notice that "index pulse" can be checked on the parallel input to
pick up the true speed of a machine. Can the PWM frequency of a VFD
be used for this? If so, can it be scaled in MACH2 to correspnd to
the speed (I believe speed is a linear function to frequency, but the
numeric value of one will not be the same as the other.

Jeff





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/S=:HM/A=2019528/rand=446470174>

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Re: Still problem w/ Pulse Frequency

Art
 

Hi Bill:

Sounds like some driver or application is shutting down the timer. I would
do a msconfig from the run button and uncheck everything in the startup tab.
Then try again. If all else fails, reinstall Windows on top of itself at
that point, it sometimes helps...

Art
www.artofcnc.ca
Re: Still problem w/ Pulse Frequency

Robert W Williams
 

I would start in your services app and shutdown any services that are not
necessary. Possibly change from automatic to manual for those services that
can be changed. It sounds as if some apps are running in the back ground.
Are you connected to a network, if not such down those services with network
involvement.

-----Original Message-----
From: bartelian [mailto:bartelian@...]
Sent: Monday, March 01, 2004 10:56 AM
To: mach1mach2cnc@...
Subject: [mach1mach2cnc] Still problem w/ Pulse Frequency


I just downloaded Mach2Mill and tried to configure it. The manual
says I should have about 24,600 Hz. My Puse Frequency starts high
but goes down to 1100-1200 Hz., the program will keep running (very
slowly) until the screen saver kicks in. Then when I hit a key to
return to the regular screen the P/Freq will go up to 25,500 Hz for
about 15 sec and then drop dramatically low again. I cannot
maintain
a consistant Pulse Freq. over about 1300 Hz.

I am running M2M Release 1.90 on a Compaq 2.6GHz, 512 Mb. So far I
checked to make sure Quicktime (Qtask.exe) is not installed, made
sure LAN is set to 100Mbps, disabled the screensaver, cleaned the
system with SpyBot, and started with a clean boot. So far nothing
works.

Thanks in advance for any help. The Program is just what I want,
but
don't know if it will work on my computer. Bill B







Yahoo! Groups Sponsor

ADVERTISEMENT


Click HereClick Here

<
/S=:HM/A=2019528/rand=763117604>


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<> .
Still problem w/ Pulse Frequency

bartelian
 

I just downloaded Mach2Mill and tried to configure it. The manual
says I should have about 24,600 Hz. My Puse Frequency starts high
but goes down to 1100-1200 Hz., the program will keep running (very
slowly) until the screen saver kicks in. Then when I hit a key to
return to the regular screen the P/Freq will go up to 25,500 Hz for
about 15 sec and then drop dramatically low again. I cannot
maintain
a consistant Pulse Freq. over about 1300 Hz.

I am running M2M Release 1.90 on a Compaq 2.6GHz, 512 Mb. So far I
checked to make sure Quicktime (Qtask.exe) is not installed, made
sure LAN is set to 100Mbps, disabled the screensaver, cleaned the
system with SpyBot, and started with a clean boot. So far nothing
works.

Thanks in advance for any help. The Program is just what I want,
but
don't know if it will work on my computer. Bill B
Re: Question on index pulse

Art
 

Jeff:

the read out make sense in RPM. Is
there a way to scale in MACH2 between the pulses and the RPM?


YEs, Mach2 will scale the input automatically and display RPM. I believe
even Mill can do this as long as the index or timing mark inputs are hooked
up and activated. Have you hooked them up yet??

Thanks,
Art
www.artofcnc.ca

----- Original Message -----
From: "washcomp" <jeff@...>
To: <mach1mach2cnc@...>
Sent: Monday, March 01, 2004 10:32 AM
Subject: [mach1mach2cnc] Re: Question on index pulse


Olivier:

Actually, this question revolved around my Bridgeport mill. In this
case I'd like to get "feedback" to MACH2 and to a readout of RPM, but
I don't think the number is as critical as in a lathe. I just
thought it made sense to use the pulses from the VFD to drive the
readout. An error of a percent or two probably wouldn't matter for
this application. It's just that the number of pulses would have to
be able to be scaled to make the read out make sense in RPM. Is
there a way to scale in MACH2 between the pulses and the RPM?

Jeff

--- In mach1mach2cnc@..., "Digital audio Pro"
<digitalaudiopro@w...> wrote:
Not enough precision for threading. Even if you could do a PWM to
pulse
convertor it will not work. You will need a true encoder, home made
or not.
More, it will be simpler.

For threading you don't only need the exact speed of the spindle,
but his
absolute position too with a good accuracy. Can only be done with
an encoder
with index + eventually other pulses for low or medium speed
applications.

Olivier.





Yahoo! Groups Links
Re: Question on index pulse

 

don't think. Art and others will confirm. But a PWM signal is not a pulse
signal. it will be complicated to convert it. Mach2 accept only index
pulses.



Olivier.
Re: Raster to Vector Converion

Ted Gregorius
 

I have been using WinTopo and I have had great results

Ted Gregorius (Pres)
TAG Systems Racing Products, Inc.
www.tagrace.com

----- Original Message -----
From: Robin Szemeti
To: mach1mach2cnc@...
Sent: Sunday, February 29, 2004 11:02 PM
Subject: Re: [mach1mach2cnc] Raster to Vector Converion


On Sunday 02 March 2003 14:27, Robert Campbell wrote:
> Peter,
>
> I have used Adobe Streamline in the past. It worked very well. I have also
> done a manual trace with Rhino. Corel Has a program called Corel Trace.

google for 'raster vector' and there is a freeware program called 'win topo'
.. seems to work for me.

>
> Bob Campbell
> Bob@...
> www.campbelldesigns.com
> Breakout board
> THC board sets
> CNC router plans
> Stepper Motors
> ----- Original Message -----
> From: "Peter Cruickshank" <crankshaft_sg@...>
> To: <mach1mach2cnc@...>
> Sent: Sunday, February 29, 2004 12:50 AM
> Subject: [mach1mach2cnc] Raster to Vector Converion
>
> > Hi;
> >
> > Rather than me re-inventing the wheel, has anyone evaluated the
> > varoious utilities for converting raster images to vector ??
> >
> > I am interested in this primarily to use MACH for engraving and
> > since it's a hobby the best balance of functionality & price are of
> > course important.
> >
> > I'm not sure what features I should look for, I guess the ability to
> > clean up images, smooth curves etc would be useful, i guess they all
> > export in .dxf format which is compatible with MACH ??!
> >
> > Any recommendations greatfully accepted !
> >
> > Thanx
> >
> > PeterC
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
>
> Yahoo! Groups Links
>
>
>

--
RapidCut CNC Technology

CNC Plasma Cutter



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Vb6/OCX - Motor tuning ?

Mark Tucker
 

Art

Is it possible to access the motor tuning through the ocx and vb6?.
I know i can call the motor tuning dialog but there is no way of
passing variables or reading variables is there?.Other than through
manual input once the dialog is on screen.If there is a possible
route using this method i could write a vb6 prog to tune the motors
and give graphs of results etc.Interesting don't you think.

Regards
Mark
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