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Hi all:

I have dealt with many bugs for the next release and have added some DXF
functions such as separate spindle speed, feedrate, and plunge rate for all
layers. Empty layers are flagged as well and turned off. Optimization has
been made better and more DXF types will load.

I still have a few bugs to go before release though, so it will be a few
days before 9.0 is released. I am looking for the reported step/dir spindle
bug at the moment and will have a couple new port commands for macro's as
well with any luck.

Thanks,
Art
www.artofcnc.ca

Art,

Would it be possible to configure Mach2 so that X axis and one
theoretical axis (Y) could be triggered just as Z axis is triggered
for threading? If that was possible then I could run two separate
Mach2 applications with one being the Z axis motion and the second
one being X and Y (theoretical axis) with motion coordinated to the
first application by the index pulse from the first. I would then be
able to turn shapes other than round such as elliptical piston skirts
and camshafts.

Servo

Steve,

If you need a linear frequency response from an RC network look up op-
amp integrators.

Bernard

--- In mach1mach2cnc@..., Steve Blackmore <steve@p...>
wrote:

On Sun, 10 Aug 2003 05:21:34 -0700 (PDT), you wrote:

I have hardware that will provide you with 0 to +10VDC and the

resolution is extremely accurate. If you were to configure Mach2 at
45kHz with the PWM at 45Hz and the MAX RPM for the Pulley Ratio set
at 1000 you would get +.001VDC per 1 revolution. The hardware that I
offer has a low offset that will allow the voltage scale to start
from 0 along an adjustable high gain that will provide up to and
including +20VDC, +10VDC being in that range. The hardware requires a
+24VDC isolated power supply along with filtering of the PWM voltage
through an RC circuit prior to input. I will up load a photo of the
hardware, title will be analog amplifier.

Thanks, but I've already thrown enough money at this problem. There
are people using step/dir or PWM, I'd just like to know how they did
it. 45Khz is out of the question, without buying yet another

computer!

I can get very even resultion by fooling Mach2 that my top speed is
higher than I want and forgetting speeds below 100rpm. There must

be

a better way though. The problem is that as op amps get close to

rail

values they cease to function very well, but you just gave me a nice
clue by mentioning 24V. If I increase my input voltage some more

(12V

currently), I can set top and bottom end to work at other than 10 &

0V

and just use the linear bit in the middle ;)

What values are you using for RC circuit?

The only reason I started playing with PWM is the problem RC7.2 has
with step/dir. Perhaps Art's next offering will fix it?

--
Steve Blackmore

Steve,

You can use either 1k Ohm resistance with 200 MFD capacitance or 10k
Ohm resisitance with 20 MFD capacitance. You are correct when you
state that an OP AMP has a problem with 0VDC. It is for that reason
that I went in search of the hardware that provides a low voltage
offset along with the high voltage gain.

Servo

--- In mach1mach2cnc@..., Steve Blackmore <steve@p...>
wrote:

On Sun, 10 Aug 2003 05:21:34 -0700 (PDT), you wrote:

I have hardware that will provide you with 0 to +10VDC and the

resolution is extremely accurate. If you were to configure Mach2 at
45kHz with the PWM at 45Hz and the MAX RPM for the Pulley Ratio set
at 1000 you would get +.001VDC per 1 revolution. The hardware that I
offer has a low offset that will allow the voltage scale to start
from 0 along an adjustable high gain that will provide up to and
including +20VDC, +10VDC being in that range. The hardware requires a
+24VDC isolated power supply along with filtering of the PWM voltage
through an RC circuit prior to input. I will up load a photo of the
hardware, title will be analog amplifier.

Thanks, but I've already thrown enough money at this problem. There
are people using step/dir or PWM, I'd just like to know how they did
it. 45Khz is out of the question, without buying yet another

computer!

I can get very even resultion by fooling Mach2 that my top speed is
higher than I want and forgetting speeds below 100rpm. There must

be

a better way though. The problem is that as op amps get close to

rail

values they cease to function very well, but you just gave me a nice
clue by mentioning 24V. If I increase my input voltage some more

(12V

currently), I can set top and bottom end to work at other than 10 &

0V

and just use the linear bit in the middle ;)

What values are you using for RC circuit?

The only reason I started playing with PWM is the problem RC7.2 has
with step/dir. Perhaps Art's next offering will fix it?

--
Steve Blackmore

On Sun, 10 Aug 2003 05:21:34 -0700 (PDT), you wrote:

I have hardware that will provide you with 0 to +10VDC and the resolution is extremely accurate. If you were to configure Mach2 at 45kHz with the PWM at 45Hz and the MAX RPM for the Pulley Ratio set at 1000 you would get +.001VDC per 1 revolution. The hardware that I offer has a low offset that will allow the voltage scale to start from 0 along an adjustable high gain that will provide up to and including +20VDC, +10VDC being in that range. The hardware requires a +24VDC isolated power supply along with filtering of the PWM voltage through an RC circuit prior to input. I will up load a photo of the hardware, title will be analog amplifier.

Thanks, but I've already thrown enough money at this problem. There
are people using step/dir or PWM, I'd just like to know how they did
it. 45Khz is out of the question, without buying yet another computer!

I can get very even resultion by fooling Mach2 that my top speed is
higher than I want and forgetting speeds below 100rpm. There must be
a better way though. The problem is that as op amps get close to rail
values they cease to function very well, but you just gave me a nice
clue by mentioning 24V. If I increase my input voltage some more (12V
currently), I can set top and bottom end to work at other than 10 & 0V
and just use the linear bit in the middle ;)

What values are you using for RC circuit?

The only reason I started playing with PWM is the problem RC7.2 has
with step/dir. Perhaps Art's next offering will fix it?

--
Steve Blackmore

Luis,

If you are doing primarily mechanical design, then Alibre would be my first
choice. If you need to do complex surfaces including text, then Rhino would
be a good addition. All of the high end programs like Solid Works are
recommending Rhino as an addition. Rhino alone can do most of what you want,
but Alibre will allow you to build mechanical parts faster.

For your Cam part VisualMill is a great product. I went to California about
a week ago for a dealers update class on VisualMill 5.0. I am very impressed
with the product. They have added in all of the 2D functions that were
missing. 5.0 should be a great seller.

I am currently using Alibre design, Rhino 3D and VisualMill.

My recommendation would be to download all three demos and try them.

When you are ready to buy, I can help you. I plan on having a support type
page on my web page for VisualMill. There is also a VisualMill user group
on Yahoo.

If there is anything that I can do to help, please let me know.

Bob Campbell

Hi Art,

Still having some issues with the A-Axis in Mach1/2

If I run a part that ends at 360 degrees and G92 it to zero, reseting
will cause the DRO to jump back to 360, if I run the part again then
it will jump to 720 and so on for subsequent program runs. It seems
that internally the axis is remembering the total of it's previous
moves and returning to this value.

Regards,
Rab

Steve,

I have hardware that will provide you with 0 to +10VDC and the resolution is extremely accurate. If you were to configure Mach2 at 45kHz with the PWM at 45Hz and the MAX RPM for the Pulley Ratio set at 1000 you would get +.001VDC per 1 revolution. The hardware that I offer has a low offset that will allow the voltage scale to start from 0 along an adjustable high gain that will provide up to and including +20VDC, +10VDC being in that range. The hardware requires a +24VDC isolated power supply along with filtering of the PWM voltage through an RC circuit prior to input. I will up load a photo of the hardware, title will be analog amplifier.

Servo

Steve Blackmore <steve@...> wrote:
Hi All

I finally managed to get a PWM signal to operate properly via an opto.
The pulse rates match perfectly, albeit inverted. (That isn't the
problem;). Nice square pulses with no spikes or rounding.

The PWM on/off time seems perfect, for full speed its high all the
time, half speed it's half on half off, etc and seems very linear.

What I can't get is a linear voltage to match.

I've tried a simple RC circuit and an LM358AN Op amp.

I'm looking for 0-10V across the speed range, instead of a linear
output it seems to follow a curve?

For example, if I pick a 0-1000rpm range, and set 500rpm to give me
5V, at 250rpm it's 2V and 750rpm it's 8V and the nearer the limits,
the worse it gets.

How are you PWM people getting around this? Are you fudging it and
setting a wider speed range than you really want and just using the
"linear" bit? Can someone suggest values for a resistor and capacitor,
I've tried several without much success.

--
Steve Blackmore


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Hello all,

I have a question for any of you that could help. Now I have my mill
hardware working with excellent results due to the Geckos (stepper
drives) and Art?s soft combination, they are so good that the
motivation has increased dramatically and now I am looking to find
the soft CAD CAM solution.

And here is the question, after researching the web during some
hours and reading previous post I end up thinking that an Alibre 3D
CAD plus VisualMill CAM or Rhino plus VisualMill would make it for
me. I design mechanical pieces and I have been working with Autocad
(2d) for time, now I would like 3D solid design. My conclusions have
been that Alibre would be Ok. but Rhino is a very attractive
solution due to the free surface modeling but what I don?t know is
if Rhino is capable alone to create solids with regular shapes also
in a practical way. Why I ask this is because I have seen some
bundles of both (Alibre+Rhino) together with makes me think Rhino is
not so good alone to work 3D apart of the NURBs surfaces.

Thank you in advance for your comments.

Hi All

I finally managed to get a PWM signal to operate properly via an opto.
The pulse rates match perfectly, albeit inverted. (That isn't the
problem;). Nice square pulses with no spikes or rounding.

The PWM on/off time seems perfect, for full speed its high all the
time, half speed it's half on half off, etc and seems very linear.

What I can't get is a linear voltage to match.

I've tried a simple RC circuit and an LM358AN Op amp.

I'm looking for 0-10V across the speed range, instead of a linear
output it seems to follow a curve?

For example, if I pick a 0-1000rpm range, and set 500rpm to give me
5V, at 250rpm it's 2V and 750rpm it's 8V and the nearer the limits,
the worse it gets.

How are you PWM people getting around this? Are you fudging it and
setting a wider speed range than you really want and just using the
"linear" bit? Can someone suggest values for a resistor and capacitor,
I've tried several without much success.

--
Steve Blackmore

--- In mach1mach2cnc@..., Art <fenerty@a...> wrote:

Derek:

Sounds like you need the special driver, have you tried it?

Art
www.artofcnc.ca

That was it. I tried it before but I guess I didn't load it properly.
I tried it again and it worked fine.

Thanks
Derek

Very Cool, this is exactly the type of example I was seeking.
Thanks,
-Lee



--- In mach1mach2cnc@..., "barker806" <barker1@m...>
wrote:

Here is the macro that I have made and it seems to work very well.
What it will do is retract the spindle to Z-.1 (mach) You change

the

tool and move it where ever you like. Than it will rappid back to

the

XYpos and do the height offset for the tool you loaded.

I hope you like it
Brian

M6start


tool = GetSelectedTool()
x = GetToolChangeStart( 0 )
y = GetToolChangeStart( 1 )
z = GetToolChangeStart( 2 )
a = GetToolChangeStart( 3 )
b = GetToolChangeStart( 4 )
c = GetToolChangeStart( 5 )

code "G00 G53 Z-.1"


SetCurrentTool( tool )

M6END

tool = GetSelectedTool()
x = GetToolChangeStart( 0 )
y = GetToolChangeStart( 1 )
z = GetToolChangeStart( 2 )
a = GetToolChangeStart( 3 )
b = GetToolChangeStart( 4 )
c = GetToolChangeStart( 5 )


code ("G43 Z-.1 H" & tool)
code ("G00 X" &x & "Y" &y & "A" &a)

Many thanks Mike,

Rab

--- In mach1mach2cnc@..., "madmike43613" <mmanrow@b...>
wrote:

Rab,
The wider of the 2 is the neutral. The way I've always remembered

is-

wide-white-silver. In other words the white wire goes to the silver
screws on the receptacle which is the wide plug.

Mike

--- In mach1mach2cnc@..., Steve Blackmore <steve@p...>
wrote:

On Thu, 07 Aug 2003 15:05:39 -0000, you wrote:

Linearity is only defined over the range 1kHz to 10khz, see note 5

in

the spec sheet. For practical purposes it extends from about

200Hz

to 12 - 13kHz, the bottom end depends on the filter capacitor. I

am

retired now and without the necessary test equipment I can't do

full

tests, but from empirical tests the response falls very rapidly,

e.g.

@4.25kHz Vout= 2.5 @8.5kHz Vout=5, @12.75kHz Vout=7V & @17.5kHz

Vout=

7.3V.

Have a look at the graph "Tachometer linearity Vs R1" on page 6

With an input voltage of 12V, Frequency of 1000Hz and a R1 value of
350K it's 0.2%

I'm missing something as I can't extrapolate a frequency response
from this graph. In your earlier post you mentioned a frequency
response of 500kHz, is this the graph you were referencing?

The input frequency is set by steps per unit and velocity, get your
min/max step rate between 1KHz and 10K and it's about as linear as

it

gets.

Maximum resolution is obtained by dividing the Kernel Frequency by
Motor RPSec, this gives steps per unit. The purpose of the warning
was to advise group members that the LM2907 has a frequency limit way
below what M1/M2 is capable of outputting. From direct email I know
that there are a lot of queries about this chip, and while it is
possible to maintain it within linear limits by manipulating the
tuning paramaters, the pre-scalar prevents one source of non
linearity and makes for very simple motor calculations.

I will post a hand drawn circuit of my revised circuit later to-

day.

Are you putting it in Mach1Mach2 files section?

Listed as FtoV with Pre-scalar.

Bernard

--
Steve Blackmore

Rab,
The wider of the 2 is the neutral. The way I've always remembered is-
wide-white-silver. In other words the white wire goes to the silver
screws on the receptacle which is the wide plug.

Mike

Thanks for the info on the LAVA card.

I have searched for it at a number of online sites and they all want
from $30 to $45 plus shipping. Where do you buy the Lava PCI Parallel
card for $16.

Thanks,
Tom

--- In mach1mach2cnc@..., Steve Blackmore <steve@p...>
wrote:

On Sun, 27 Jul 2003 17:48:55 -0000, you wrote:

Any ideas on where I can buy a PCI parallel port card,

inexpensively

($10 - 20)that is guaranteed to work with both Windows XP and
Win2000. Most of the PCI cards are around $30 plus shipping when
bought new and the cards on ebay have no guarantee that they will
work on 2000/XP. I bought a dual parallel PCI card on ebay and it
only has drivers for win/95/98/ME and the manufacturer says they
aren't going to have drivers for it for 2000/xp. Any information
would be appreciated.

Tom - valuable lesson, don't buy anything off ebay unles you have
researched it! All is not lost though - just resell it back on ebay!

Then - Buy a Lava PCI card, they work fine and are available for $19
!!
--
Steve Blackmore

Derek:

Sounds like you need the special driver, have you tried it?

Art
www.artofcnc.ca

How about mapping the wheel of a wheel mouse
for the feedrate override. It would be easy to use.
Once you have a hold on the mouse, you can go
back to looking in the work zone. (Good
human engineering)

Maybe a toggle between FRO and Spindle Override?

Hey Art, can you put that one on the to-do list?


Dave G

Message: 4
Date: Thu, 7 Aug 2003 19:25:33 +0100
From: "John Prentice" <JAPrentice@...>
Subject: Keyboard/Mouse software

Hi

Does anybody know of any software (e.g. keyboard remapper, mouse hot keys

functions etc.) that will turn clicks on an IntelliMouse's scroll wheel into
keystrokes?

It potentially seems to be an excellent interface for feedrate override if

only one could generate some suitable keystrokes to trigger the Mach2
override control buttons.

John Prentice

Hi All,

I've just received a couple of Bosch routers from the US,
they have polarised plugs, ie. two spades, one wider than the other,
could any of the US members tell me which is the Live and which is
Neutral ? Do any of the UK members know where I can get some suitable
sockets ?

thanks,

Rab Gordon

Hi Art
Welcome back

I'm putting together a new system for my router. It's a Aopen
motherboard with a 700mhz intel celeron running Win2K. I installed
mach2 rc7 and manually installed the driver. When I tried to open
mach2 the splash screen starts up but immediately shuts down the
system causing a restart. I tried uninstalling and installing rc3.0
and got the same results.
Any ideas on this?

Thanks
Derek