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Steve:

Annoyingly no, I haven't found the problem yet. It may be that my version
doesn't have it. I think I found the toggle bug, but I'm not sure yet.
Almost all the other bugs are done..Still Looking..

BTW: Send me your lathe.xml file will you, it may help...
Thanks,
Art
www.artofcnc.ca

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%

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.

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

Are you putting it in Mach1Mach2 files section?

--
Steve Blackmore

Hi Steve:

Thanks for the bugs. YOur right, I hadn't considered the poor tool tables
or fixture table. I will implement new ones for lathe only.
The touch off, should be done in your example by entering 30 in the touch
correction and turning it on. then do touch of the bit to the stoch and hit
"touch" on the X, 30 will appear. If you use a guage, enter 30 + guage block
in the corretion and the proper diameter will appear. Turn off correction
and toush the Z to zero it or enter a length if you wish.

There are no special G-Codes for lathe yet, only G32 is active. I will
look into the error's but that is a holdover from EMC which at the time the
interpreter code was written, did not tripo errors on some types of
problems.

Lathe is still pretty early, but as soon as the bugs are gone in the next
version of mill, I'll start to strengthen it up and add more codes. I'm
considering some code options in the way all these lathe codes will be
handled. Since the EMC interpreter cannot handle them and most of them are
"cycle" type of codes, I am still figureing out how best to handle this
option.

Thanks,
Art
www.artofcnc.ca

Here are a few problems with toolchanges

Lathe tooltable overwrites Mill tooltable
Entries are listed as Z,X rather than X,Z?
Using Jog screen to touch entries off always overwrites tool 0 even if
a different number is typed in tool number box.

How is the touch correction supposed to work?

My job X0, Z0 is center of stock diameter, say 30mm from end, and all
my gcode coordinates work from there - if the stock is 10mm diameter
- how do I let mach2 lathe know this?

Also have you got a list of supported G & M codes for lathe, I've
noticed if it doesn't recognise a Gcode it simply skips that line -
that could be nasty - surely it should error and stop?
--
Steve Blackmore

--- In mach1mach2cnc@..., "sciciora" <ciciora@C...> wrote:

That's it; I don't think I'm going to post from Yahoo anymore...

How

were the previous two for my first post... :-(

I need to buy a new computer so I can run Mach1/2, and am looking

for

recomendations. I'm sure it's been discussed, but after an hour of
searching the archives, I've come up dry.

It seems that a 2.2 gig celeron is a good price breakpoint. Anyone
have experience with this processor running Machx? Is it good

enough

to run win XP home/pro/Win2k? I'm a win98 user, so I don't know how
much ghz is required to run these operating systems and cad

programs.

Is it worth $100 to make the jump to a 2.4GHz p4?

What about operating systems? What's the difference (to a cad/cam
operator) running XP Home, XP Pro, or Win2K? Is it worth $70 to
upgrade?

Thanks for putting up with my goof posts, and my newbe questions.
I've seen Mach2 running a Taig, and am now willing to spend as much

as

my Taig for new computer/software to make mine run that nice.

(CNCPro

on a P1 around 233 MHz current configuration).

- Steve

I'm sure others will weigh in here. You don't need a 2.2G machine to
run MACH1 or 2. The thing that you do need is to have a machine
dedicated to the controller task and not running a bunch of other
known (or unknown) programs. I have a 700Mhz little AMD board I
picked up for virtually nothing and it runs MACH1 or 2 just fine. I
prefer WIN2000 (no flames here guy's) and find it to be extremely
stable. My shop machine is a 900MHZ clone and has never had a
problem with any of the MACH2 releases. I made sure NOTHING else is
running but the bare essentials to keep WIN2000 happy. I do have it
networked with my other machines and was careful to set the network
card up NOT to auto negotiate the link speed. Since I don't need the
45Khz pulse rate to drive my table to full rapids I run in 25KHZ
mode. Like my father once observed when I showed him my hot new
muscle car (1960's) with 130 on the speedometer: "Son, why would
anybody need to go that fast?"

For my money I would rather have the 2.2 G machine as my CAD/CAM
design station and keep my old slow 900 as a dedicated controller.
While the subject of the best OS borders on a religious descussion, I
was still using WIN98 on several of my machine up until this year.
It wasn't broke, so I didn't fix it! I finally upgraded so that I
would have a consistant interface and not have to remember the
different places to go for common Windows functions.

In your choice of machines, opt for one that has a separate video
card rather than video on the mother board. Most of those designs
share system memory and cause problem with MACH2.

--- In mach1mach2cnc@..., "japrenticeuk" <john@c...>
wrote:

--- In mach1mach2cnc@..., "caudlet" <thom@t...> wrote:

Gentlemen:

I agree that the limit switches are there to save a crash and

should

do two things:

Instantly stop the motors on all axis
Issue an e-stop signal back to the software.

<snip>

Many thanks for original point and everyone's contributions to

this.

In light of them I have decided to strengthen the advice in the
Mach2Mill manual to use a totally hardware EStop, limits strategy.
Look out for this in the next release which documents the new F-key
screen switching and XML profiles.

John, If it would help I think I have an electronic copy of a
schematic for a strictly electromechanical (relays and switches) of
providing a failsafe limit. Let me know if you want it for inclusion.

TOM C

Best wishes

John Prentice

That's it; I don't think I'm going to post from Yahoo anymore... How
were the previous two for my first post... :-(

I need to buy a new computer so I can run Mach1/2, and am looking for
recomendations. I'm sure it's been discussed, but after an hour of
searching the archives, I've come up dry.

It seems that a 2.2 gig celeron is a good price breakpoint. Anyone
have experience with this processor running Machx? Is it good enough
to run win XP home/pro/Win2k? I'm a win98 user, so I don't know how
much ghz is required to run these operating systems and cad programs.
Is it worth $100 to make the jump to a 2.4GHz p4?

What about operating systems? What's the difference (to a cad/cam
operator) running XP Home, XP Pro, or Win2K? Is it worth $70 to
upgrade?

Thanks for putting up with my goof posts, and my newbe questions.
I've seen Mach2 running a Taig, and am now willing to spend as much as
my Taig for new computer/software to make mine run that nice. (CNCPro
on a P1 around 233 MHz current configuration).

- Steve

Brian:

code ("G00 X" &x & "Y" &y & "A" &a)

Wow, string formatting within a macro.. Great Work!!!

Art
www.artofcnc.ca

Hi All

I am trying to improve the macro section in the Manual and must share a bug in the manual and a feature in Mach2 with you.

My "bug" is in the definition of the Param3() function in Appendix 5. Param3() actually gets the value of the S word in a macro call e.g. if macro M55 contains a VB Script line "valu = Param3()" and the macro is called in a part program by "M55 S3000" then variable "valu"will be set to 3000. The manual (Rev A1) says it is the L word that corresponds to Param3.

The "feature" is that the S word is checked against the current pulley setting by Mach2 before it is passed to the macro. If it is too high or too low then it is not passed. You need to beware and only use this word to pass a valid spindle speed to a macro. P & Q will pass any value.

I hope the next version of the manual will have some helpful macro examples in it.

Best wishes

John Prentice

--- In mach1mach2cnc@..., "John Prentice"
<JAPrentice@i...> wrote:
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

One of the best remaper I have come across is AIMKeys


Don't know if this will work as I don't have an intellimouse.

John S.

On Wed, 06 Aug 2003 16:50:47 -0300, you wrote:

Definitely noise on the step pin. When you jog, the DIR pin gets set and
dosent change until you change diretcion, thats why it creeps in the last
direction.

Fixed that - I had broken the screen wire on the connector!

Another problem just cropped up, not used tooltables until now, lathe
tooltable seems to overwrite mill tooltable & vice versa. Also can you
set it as X,Z offset not Z,X offset or is there a reason for this?
Also store touch facility is missing?
--
Steve Blackmore

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)

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

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the mach1mach2cnc
group.

File : /FtoV with Pre-scalar.jpg
Uploaded by : bwr2fixit <bwjarandall@...>
Description : FtoV with pre-Scalar

You can access this file at the URL



To learn more about file sharing for your group, please visit



Regards,

bwr2fixit <bwjarandall@...>

Steve,

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.

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

Bernard

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

On Thu, 07 Aug 2003 00:36:53 -0000, you wrote:

Hi All,

A warning to anyone using a LM2907/2917 Frequency to Voltage
converter for spindle control. The chip data sheet does not

specify

an upper frequency limit, I have found that it is very non linear
above about 13KHz, I did not realize the problem with Mach1

because I

was using a D-FF as a pre-divider, however when I set up Mach2 for

a

Kernel speed of 35KHz I found that at above half spindle speed I

was

getting very strange results. The answer was to use the second D-

FF

on the chip, so there is now a divide by 4 pre-scalar to the

FtoV.

This modification should be good for M2 up to a Kernel frequency

of

45KHz.

Bernard - Can you explain this a little more, a circuit diagram

might

help? The National spec sheet shows it as pretty linear ie less than
0.4% across a 500kHz input range??
--
Steve Blackmore

Did you every see a spark from a switch you turned off. Imagine if
you switched power on and off over and over again. The switch would
wear out. A problem for some motors is that their insulation was not
rated for switching on and off so much. DC doesn't change that much,
so you can make it cheaper with less insulation. Motors rated for
PWM or SCR are beefier to support high switching rates. Otherwise
they are similar.

--- In mach1mach2cnc@..., "caudlet" <thom@t...> wrote:

Gentlemen:

I agree that the limit switches are there to save a crash and

should

do two things:

Instantly stop the motors on all axis
Issue an e-stop signal back to the software.

<snip>

Many thanks for original point and everyone's contributions to this.
In light of them I have decided to strengthen the advice in the
Mach2Mill manual to use a totally hardware EStop, limits strategy.
Look out for this in the next release which documents the new F-key
screen switching and XML profiles.

Best wishes

John Prentice

On Thu, 07 Aug 2003 00:36:53 -0000, you wrote:

Hi All,

A warning to anyone using a LM2907/2917 Frequency to Voltage
converter for spindle control. The chip data sheet does not specify
an upper frequency limit, I have found that it is very non linear
above about 13KHz, I did not realize the problem with Mach1 because I
was using a D-FF as a pre-divider, however when I set up Mach2 for a
Kernel speed of 35KHz I found that at above half spindle speed I was
getting very strange results. The answer was to use the second D-FF
on the chip, so there is now a divide by 4 pre-scalar to the FtoV.
This modification should be good for M2 up to a Kernel frequency of
45KHz.

Bernard - Can you explain this a little more, a circuit diagram might
help? The National spec sheet shows it as pretty linear ie less than
0.4% across a 500kHz input range??
--
Steve Blackmore